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Climate and Average Weather Year Round in Sligo Ireland

In Sligo, the summers are cool; the winters are long, very cold, and wet; and it is windy and mostly cloudy year round. Over the course of the year, the temperature typically varies from 38°F to 64°F and is rarely below 31°F or above 71°F.

Based on the tourism score, the best time of year to visit Sligo for warm-weather activities is from early July to late August.

Climate in Sligo

coldcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow46%46%28%28%overcastclearprecipitation: 4.2 inprecipitation: 4.2 in2.2 in2.2 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 5.3tourism score: 5.30.10.1
Sligo weather by month. Click on each chart for more information.

The warm season lasts for 3.0 months, from June 13 to September 15, with an average daily high temperature above 60°F. The hottest month of the year in Sligo is July, with an average high of 63°F and low of 54°F.

The cool season lasts for 4.0 months, from November 19 to March 20, with an average daily high temperature below 49°F. The coldest month of the year in Sligo is January, with an average low of 38°F and high of 46°F.

Average High and Low Temperature in Sligo

Average High and Low Temperature in SligowarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 1746°FFeb 1746°FAug 264°FAug 264°F38°F38°F55°F55°FJun 1360°FJun 1360°FSep 1560°FSep 1560°FNov 1949°FNov 1949°F50°F50°F51°F51°F42°F42°F40°F40°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 46°F46°F49°F53°F57°F61°F63°F63°F60°F55°F50°F47°F
Temp. 42°F42°F44°F47°F52°F56°F59°F59°F56°F51°F46°F43°F
Low 38°F38°F40°F42°F46°F51°F54°F54°F51°F46°F42°F39°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in Sligo

Average Hourly Temperature in SligoJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowvery coldvery coldcoldcoldcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Metchosin, Canada (4,408 miles away) is the far-away foreign place with temperatures most similar to Sligo (view comparison).

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Compare Sligo to another city:

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In Sligo, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Sligo begins around April 4 and lasts for 6.4 months, ending around October 17.

The clearest month of the year in Sligo is July, during which on average the sky is clear, mostly clear, or partly cloudy 45% of the time.

The cloudier part of the year begins around October 17 and lasts for 5.6 months, ending around April 4.

The cloudiest month of the year in Sligo is January, during which on average the sky is overcast or mostly cloudy 71% of the time.

Cloud Cover Categories in Sligo

Cloud Cover Categories in SligoclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 1746%Jul 1746%Dec 1928%Dec 1928%Apr 437%Apr 437%Oct 1737%Oct 1737%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 71%69%67%61%56%56%55%55%57%63%69%71%
Clearer 29%31%33%39%44%44%45%45%43%37%31%29%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Sligo varies throughout the year.

The wetter season lasts 4.1 months, from October 12 to February 15, with a greater than 43% chance of a given day being a wet day. The month with the most wet days in Sligo is January, with an average of 16.1 days with at least 0.04 inches of precipitation.

The drier season lasts 7.9 months, from February 15 to October 12. The month with the fewest wet days in Sligo is April, with an average of 10.0 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Sligo is January, with an average of 15.8 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 54% on January 3.

Daily Chance of Precipitation in Sligo

Daily Chance of Precipitation in SligowetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 355%Jan 355%Apr 2231%Apr 2231%Jan 154%Jan 154%Oct 1243%Oct 1243%Feb 1543%Feb 1543%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 15.8d12.0d12.6d10.0d10.3d10.2d11.6d12.6d11.7d13.7d14.6d15.7d
Mixed 0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.1d
Any 16.1d12.1d12.6d10.0d10.3d10.2d11.6d12.6d11.7d13.7d14.7d15.8d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Sligo experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Sligo. The month with the most rain in Sligo is November, with an average rainfall of 4.1 inches.

The month with the least rain in Sligo is April, with an average rainfall of 2.2 inches.

Average Monthly Rainfall in Sligo

Average Monthly Rainfall in SligoJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inOct 304.1 inOct 304.1 inApr 212.2 inApr 212.2 inDec 264.1 inDec 264.1 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 4.0″3.3″2.8″2.2″2.3″2.3″2.5″3.0″3.1″3.8″4.1″4.1″

The length of the day in Sligo varies extremely over the course of the year. In 2023, the shortest day is December 22, with 7 hours, 19 minutes of daylight; the longest day is June 21, with 17 hours, 12 minutes of daylight.

Hours of Daylight and Twilight in Sligo

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 8.0h9.8h11.9h14.1h16.1h17.1h16.5h14.8h12.6h10.5h8.5h7.4h

The earliest sunrise is at 4:59 AM on June 18, and the latest sunrise is 3 hours, 56 minutes later at 8:54 AM on December 29. The earliest sunset is at 4:09 PM on December 14, and the latest sunset is 6 hours, 3 minutes later at 10:12 PM on June 24.

Daylight saving time (DST) is observed in Sligo during 2023, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.

Sunrise & Sunset with Twilight and Daylight Saving Time in Sligo

Sunrise & Sunset with Twilight and Daylight Saving Time in SligoJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 184:59 AMJun 184:59 AM10:12 PMJun 2410:12 PMJun 24Dec 144:09 PMDec 144:09 PM8:54 AMDec 298:54 AMDec 29Mar 26DSTMar 26DSTDSTOct 29DSTOct 29daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2023. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Sligo

Solar Elevation and Azimuth in SligoJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM00001010102020303040405000010101010202030304040501259NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2023. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Sligo

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Sligo, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels in Sligo

Humidity Comfort Levels in SligoJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 300%Jan 300%Jul 240%Jul 240%comfortablecomfortabledrydryhumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Sligo experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.5 months, from October 12 to March 29, with average wind speeds of more than 14.2 miles per hour. The windiest month of the year in Sligo is January, with an average hourly wind speed of 16.8 miles per hour.

The calmer time of year lasts for 6.5 months, from March 29 to October 12. The calmest month of the year in Sligo is July, with an average hourly wind speed of 11.6 miles per hour.

Average Wind Speed in Sligo

Average Wind Speed in SligowindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphJan 617.0 mphJan 617.0 mphJul 2611.5 mphJul 2611.5 mphOct 1214.2 mphOct 1214.2 mphMar 2914.2 mphMar 2914.2 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 16.815.915.113.112.511.911.612.113.314.415.115.9

The predominant average hourly wind direction in Sligo varies throughout the year.

The wind is most often from the west for 2.5 months, from February 15 to April 29; for 4.7 months, from May 6 to September 28; and for 3.7 weeks, from October 31 to November 26, with a peak percentage of 43% on July 3. The wind is most often from the south for 1.0 weeks, from April 29 to May 6; for 1.1 months, from September 28 to October 31; and for 2.6 months, from November 26 to February 15, with a peak percentage of 38% on October 12.

Wind Direction in Sligo

Wind Direction in SligoSWWSWSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Sligo is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.0 months, from July 1 to October 2, with an average temperature above 57°F. The month of the year in Sligo with the warmest water is August, with an average temperature of 60°F.

The time of year with cooler water lasts for 3.9 months, from December 27 to April 22, with an average temperature below 49°F. The month of the year in Sligo with the coolest water is February, with an average temperature of 47°F.

Average Water Temperature in Sligo

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 48°F47°F47°F48°F52°F55°F58°F60°F58°F56°F53°F50°F

To characterize how pleasant the weather is in Sligo throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Sligo for general outdoor tourist activities is from early July to late August, with a peak score in the last week of July.

Tourism Score in Sligo

Tourism Score in Sligobest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.35.30.10.1precipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Sligo for hot-weather activities is from mid July to early August, with a peak score in the last week of July.

Beach/Pool Score in Sligo

Beach/Pool Score in SligoJanFebMarAprMayJunJulAugSepOctNovDec002244668810100.60.60.00.0precipitationprecipitationcloudscloudstemperaturetemperature
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Sligo typically lasts for 9.9 months (299 days), from around February 23 to around December 19, rarely starting after March 31, or ending before November 3.

Time Spent in Various Temperature Bands and the Growing Season in Sligo

Time Spent in Various Temperature Bands and the Growing Season in Sligogrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 2350%Feb 2350%Dec 1950%Dec 1990%Mar 3190%Mar 3190%Nov 390%Nov 311%Jan 1611%Jan 16Jul 14100%Jul 14100%NowNowvery coldcoldcoolfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Sligo should appear around May 18, only rarely appearing before May 4 or after June 4.

Growing Degree Days in Sligo

Growing Degree Days in SligoJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°FMay 1890°FMay 1890°FSep 7900°FSep 7900°FDec 311,122°FDec 311,122°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from May 1 to August 11, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest month of the year in Sligo is June, with an average of 5.7 kWh.

The darker period of the year lasts for 4.0 months, from October 22 to February 23, with an average daily incident shortwave energy per square meter below 1.5 kWh. The darkest month of the year in Sligo is December, with an average of 0.4 kWh.

Average Daily Incident Shortwave Solar Energy in Sligo

Average Daily Incident Shortwave Solar Energy in SligobrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJun 125.7 kWhJun 125.7 kWhDec 220.4 kWhDec 220.4 kWhMay 14.7 kWhMay 14.7 kWhAug 114.7 kWhAug 114.7 kWhOct 221.5 kWhOct 221.5 kWhFeb 231.5 kWhFeb 231.5 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 0.61.22.44.05.25.75.44.53.11.70.80.4

For the purposes of this report, the geographical coordinates of Sligo are 54.270 deg latitude, -8.469 deg longitude, and 33 ft elevation.

The topography within 2 miles of Sligo contains only modest variations in elevation, with a maximum elevation change of 387 feet and an average elevation above sea level of 83 feet. Within 10 miles contains only modest variations in elevation (2,142 feet). Within 50 miles also contains large variations in elevation (2,621 feet).

The area within 2 miles of Sligo is covered by grassland (48%) and artificial surfaces (33%), within 10 miles by grassland (41%) and trees (15%), and within 50 miles by grassland (34%) and water (26%).

This report illustrates the typical weather in Sligo, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Sligo.

For each station, the records are corrected for the elevation difference between that station and Sligo according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Sligo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sligo and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Sligo and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.