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Fall Weather in Arklow Ireland

Daily high temperatures decrease by 14°F, from 63°F to 49°F, rarely falling below 43°F or exceeding 67°F.

Daily low temperatures decrease by 12°F, from 54°F to 43°F, rarely falling below 36°F or exceeding 59°F.

For reference, on August 1, the hottest day of the year, temperatures in Arklow typically range from 56°F to 65°F, while on February 18, the coldest day of the year, they range from 40°F to 47°F.

Average High and Low Temperature in the Fall in Arklow

Average High and Low Temperature in the Fall in ArklowSepOctNov35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°FSummerWinterSep 163°FSep 163°F54°F54°FNov 3049°FNov 3049°F43°F43°FOct 159°FOct 159°F51°F51°FNov 154°FNov 154°F47°F47°F
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.

The figure below shows you a compact characterization of the hourly average fall temperatures. The horizontal axis is the day, 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 the Fall in Arklow

Average Hourly Temperature in the Fall in ArklowSepOctNov12 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 AMSummerWintervery coldvery coldcoldcool
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.

Ocean Shores, Washington, United States (4,644 miles away) is the far-away foreign place with temperatures most similar to Arklow (view comparison).

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The fall in Arklow experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 50% to 62%.

The clearest day of the fall is September 7, with clear, mostly clear, or partly cloudy conditions 51% of the time.

For reference, on January 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on July 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 52%.

Cloud Cover Categories in the Fall in Arklow

Cloud Cover Categories in the Fall in ArklowSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterSep 150%Sep 150%Nov 3038%Nov 3038%Oct 145%Oct 145%Nov 139%Nov 139%clearmostly 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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Arklow, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 27% and ending it at 37%.

For reference, the year's highest daily chance of a wet day is 42% on January 6, and its lowest chance is 24% on July 16.

Probability of Precipitation in the Fall in Arklow

Probability of Precipitation in the Fall in ArklowSepOctNov0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%SummerWinterSep 127%Sep 127%Nov 3037%Nov 3037%Oct 134%Oct 134%Nov 141%Nov 141%rain
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).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in Arklow is rapidly increasing, starting the season at 2.1 inches, when it rarely exceeds 3.6 inches or falls below 0.6 inches, and ending the season at 3.1 inches, when it rarely exceeds 5.3 inches or falls below 1.4 inches.

The highest average 31-day accumulation is 3.3 inches on October 29.

Average Monthly Rainfall in the Fall in Arklow

Average Monthly Rainfall in the Fall in ArklowSepOctNov0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inSummerWinterOct 283.3 inOct 283.3 inSep 12.1 inSep 12.1 inNov 303.1 inNov 303.1 inOct 12.8 inOct 12.8 in
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.

Over the course of the fall in Arklow, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 5 hours, 36 minutes, implying an average daily decrease of 3 minutes, 44 seconds, and weekly decrease of 26 minutes, 9 seconds.

The shortest day of the fall is November 30, with 8 hours, 0 minutes of daylight and the longest day is September 1, with 13 hours, 36 minutes of daylight.

Hours of Daylight and Twilight in the Fall in Arklow

Hours of Daylight and Twilight in the Fall in ArklowSepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterSep 2212 hr, 11 minSep 2212 hr, 11 minnightnightdaydayNov 308 hr, 0 minNov 308 hr, 0 minNov 19 hr, 31 minNov 19 hr, 31 min
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.

The earliest sunrise of the fall in Arklow is 6:35 AM on September 1 and the latest sunrise is 1 hour, 37 minutes later at 8:13 AM on November 30.

The latest sunset is 8:12 PM on September 1 and the earliest sunset is 3 hours, 59 minutes earlier at 4:13 PM on November 30.

Daylight saving time (DST) starts at 1:00 AM on October 27, 2024, shifting sunrise and sunset to be an hour later.

For reference, on June 20, the longest day of the year, the Sun rises at 4:59 AM and sets 16 hours, 54 minutes later, at 9:53 PM, while on December 21, the shortest day of the year, it rises at 8:34 AM and sets 7 hours, 36 minutes later, at 4:10 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in Arklow

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in ArklowSepOctNov2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter6:35 AM6:35 AMSep 18:12 PMSep 18:12 PM8:13 AM8:13 AMNov 304:13 PMNov 304:13 PM7:26 AM7:26 AMOct 17:00 PMOct 17:00 PM7:22 AM7:22 AMNov 14:53 PMNov 14:53 PMDSTOct 27DSTOct 27SolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the fall. 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 the Fall in Arklow

Solar Elevation and Azimuth in the Fall in ArklowSepOctNov12 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 AMSummerWinter0020300010103040
northeastsouthwest
Solar elevation and azimuth in the the fall of 2024. 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 the fall of 2024. 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Fall in Arklow

Moon Rise, Set & Phases in the Fall in ArklowSepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterAug 412:14 PMAug 412:14 PMAug 197:26 PMAug 197:26 PMSep 32:56 AMSep 32:56 AMSep 183:35 AMSep 183:35 AMOct 27:50 PMOct 27:50 PMOct 1712:27 PMOct 1712:27 PMNov 112:48 PMNov 112:48 PMNov 159:29 PMNov 159:29 PMDec 16:22 AMDec 16:22 AMDec 159:02 AMDec 159:02 AMDec 3010:28 PMDec 3010:28 PM9:43 PM9:43 PM8:59 PM8:59 PM6:49 AM6:49 AM6:47 AM6:47 AM8:24 PM8:24 PM7:30 PM7:30 PM7:20 AM7:20 AM6:50 PM6:50 PM5:58 PM5:58 PM7:49 AM7:49 AM7:25 AM7:25 AM4:28 PM4:28 PM9:00 AM9:00 AM9:01 AM9:01 AM3:39 PM3:39 PM8:59 AM8:59 AM3:11 PM3:11 PM
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 chance that a given day will be muggy in Arklow is essentially constant during the fall, remaining around 0% throughout.

For reference, on July 21, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Fall in Arklow

Humidity Comfort Levels in the Fall in ArklowSepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterSep 10%Sep 10%Nov 300%Nov 300%Oct 10%Oct 10%Nov 10%Nov 10%humidhumidcomfortablecomfortabledrydry
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.

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 Arklow is very rapidly increasing during the fall, increasing from 12.5 miles per hour to 16.8 miles per hour over the course of the season.

For reference, on January 3, the windiest day of the year, the daily average wind speed is 18.1 miles per hour, while on July 23, the calmest day of the year, the daily average wind speed is 10.8 miles per hour.

Average Wind Speed in the Fall in Arklow

Average Wind Speed in the Fall in ArklowSepOctNov0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphSummerWinterSep 112.5 mphSep 112.5 mphNov 3016.8 mphNov 3016.8 mphOct 114.3 mphOct 114.3 mphNov 116.2 mphNov 116.2 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Arklow during the fall is predominantly out of the west from September 1 to September 30 and from October 22 to November 30 and the south from September 30 to October 22.

Wind Direction in the Fall in Arklow

Wind Direction in the Fall in ArklowWSWSepOctNov0%100%20%80%40%60%60%40%80%20%100%0%SummerWinterwestsouthnortheast
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).

Arklow 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 surface water temperature in Arklow is decreasing during the fall, falling by 6°F, from 59°F to 53°F, over the course of the season.

Average Water Temperature in the Fall in Arklow

Average Water Temperature in the Fall in ArklowSepOctNov46°F46°F48°F48°F50°F50°F52°F52°F54°F54°F56°F56°F58°F58°F60°F60°F62°F62°FSummerWinterSep 159°FSep 159°FNov 3053°FNov 3053°FOct 158°FOct 158°FNov 156°FNov 156°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Arklow typically lasts for 11 months (322 days), from around February 11 to around December 30, rarely starting after March 24, or ending before November 30.

The fall in Arklow is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 90% over the course of the season.

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Arklow

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Arklowgrowing seasonSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinter100%Sep 1100%Sep 190%Nov 3090%Nov 30100%Oct 1100%Oct 1100%Nov 1100%Nov 150%Dec 3050%Dec 30very coldcoldcool
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.

The average accumulated growing degree days in Arklow are increasing during the fall, increasing by 377°F, from 983°F to 1,360°F, over the course of the season.

Growing Degree Days in the Fall in Arklow

Growing Degree Days in the Fall in ArklowSepOctNov900°F900°F1,000°F1,000°F1,100°F1,100°F1,200°F1,200°F1,300°F1,300°F1,400°F1,400°F1,500°F1,500°FSummerWinterSep 1983°FSep 1983°FNov 301,360°FNov 301,360°FOct 11,201°FOct 11,201°FNov 11,320°FNov 11,320°F
The average growing degree days accumulated over the course of the fall, 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 in Arklow is very rapidly decreasing during the fall, falling by 3.6 kWh, from 4.3 kWh to 0.7 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Fall in Arklow

Average Daily Incident Shortwave Solar Energy in the Fall in ArklowSepOctNov0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhSummerWinterSep 14.3 kWhSep 14.3 kWhNov 300.7 kWhNov 300.7 kWhOct 12.7 kWhOct 12.7 kWhNov 11.3 kWhNov 11.3 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Arklow are 52.793 deg latitude, -6.141 deg longitude, and 0 ft elevation.

The topography within 2 miles of Arklow contains only modest variations in elevation, with a maximum elevation change of 318 feet and an average elevation above sea level of 47 feet. Within 10 miles contains only modest variations in elevation (1,949 feet). Within 50 miles contains very significant variations in elevation (3,061 feet).

The area within 2 miles of Arklow is covered by water (51%), artificial surfaces (21%), and grassland (18%), within 10 miles by water (46%) and grassland (27%), and within 50 miles by water (54%) and grassland (23%).

This report illustrates the typical weather in Arklow, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Arklow.

For each station, the records are corrected for the elevation difference between that station and Arklow 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 Arklow is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Arklow 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 Arklow 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.

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