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Climate and Average Weather Year Round in San Sebastián del Sur Mexico

In San Sebastián del Sur, the wet season is overcast, the dry season is partly cloudy, and it is warm year round. Over the course of the year, the temperature typically varies from 43°F to 86°F and is rarely below 36°F or above 90°F.

Based on the tourism score, the best time of year to visit San Sebastián del Sur for warm-weather activities is from late April to early June.

Climate in San Sebastián del Sur

warmhotwarmJanFebMarAprMayJunJulAugSepOctNovDecNowNow63%63%7%7%clearovercastprecipitation: 6.1 inprecipitation: 6.1 in0.0 in0.0 inmuggy: 5%muggy: 5%0%0%drydrytourism score: 6.6tourism score: 6.63.63.6
San Sebastián del Sur weather by month. Click on each chart for more information.

Average Temperature in San Sebastián del Sur

The hot season lasts for 1.8 months, from April 14 to June 8, with an average daily high temperature above 83°F. The hottest day of the year is May 16, with an average high of 86°F and low of 56°F.

The cool season lasts for 2.4 months, from November 30 to February 10, with an average daily high temperature below 76°F. The coldest day of the year is January 13, with an average low of 43°F and high of 73°F.

Average High and Low Temperature in San Sebastián del Sur

Average High and Low Temperature in San Sebastián del SurhotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 1373°FJan 1373°FMay 1686°FMay 1686°F43°F43°F56°F56°FApr 1483°FApr 1483°FNov 3076°FNov 3076°F50°F50°F46°F46°F44°F44°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.

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 San Sebastián del Sur

Average Hourly Temperature in San Sebastián del SurJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowcoldcoldcoolcoolcoolcomfortablewarmvery coldcoldcoldcomfortablevery cold
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.

Sanaa, Yemen (9,173 miles away) and Soavinandriana, Madagascar (10,510 miles) are the far-away foreign places with temperatures most similar to San Sebastián del Sur (view comparison).

Compare San Sebastián del Sur to another city:

Clouds

In San Sebastián del Sur, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in San Sebastián del Sur begins around October 26 and lasts for 7.6 months, ending around June 12. On February 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 63% of the time, and overcast or mostly cloudy 37% of the time.

The cloudier part of the year begins around June 12 and lasts for 4.4 months, ending around October 26. On September 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 93% of the time, and clear, mostly clear, or partly cloudy 7% of the time.

Cloud Cover Categories in San Sebastián del Sur

Cloud Cover Categories in San Sebastián del SurclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Feb 2363%Feb 2363%Sep 37%Sep 37%Oct 2634%Oct 2634%Jun 1236%Jun 1236%NowNowclearmostly clearmostly cloudyovercastpartly cloudy
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.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in San Sebastián del Sur varies very significantly throughout the year.

The wetter season lasts 4.0 months, from June 8 to October 7, with a greater than 38% chance of a given day being a wet day. The chance of a wet day peaks at 75% on August 22.

The drier season lasts 8.0 months, from October 7 to June 8. The smallest chance of a wet day is 1% on April 2.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 75% on August 22.

Daily Chance of Precipitation in San Sebastián del Sur

Daily Chance of Precipitation in San Sebastián del SurwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Aug 2275%Aug 2275%Apr 21%Apr 21%Jan 14%Jan 14%Jun 838%Jun 838%Oct 738%Oct 738%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).

Rainfall

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. San Sebastián del Sur experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.9 months, from May 16 to February 11, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 9, with an average total accumulation of 6.1 inches.

The rainless period of the year lasts for 3.1 months, from February 11 to May 16. The least rain falls around April 15, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall in San Sebastián del Sur

Average Monthly Rainfall in San Sebastián del SurrainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inJul 96.1 inJul 96.1 inApr 150.0 inApr 150.0 inAug 316.0 inAug 316.0 inJan 220.9 inJan 220.9 inDec 120.2 inDec 120.2 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 liquid-equivalent snowfall.

Sun

The length of the day in San Sebastián del Sur varies over the course of the year. In 2021, the shortest day is December 21, with 10 hours, 56 minutes of daylight; the longest day is June 20, with 13 hours, 20 minutes of daylight.

Hours of Daylight and Twilight in San Sebastián del Sur

Hours of Daylight and Twilight in San Sebastián del SurJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2013 hr, 20 minJun 2013 hr, 20 minJun 2012 hr, 7 minSep 2212 hr, 7 minSep 2210 hr, 56 minDec 2110 hr, 56 minDec 21nightnightdayNowNow
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 is at 6:45 AM on April 3, and the latest sunrise is 1 hour, 9 minutes later at 7:54 AM on October 30. The earliest sunset is at 6:13 PM on November 25, and the latest sunset is 2 hours, 24 minutes later at 8:37 PM on July 4.

Daylight saving time (DST) is observed in San Sebastián del Sur during 2021, starting in the spring on April 4, lasting 6.8 months, and ending in the fall on October 31.

Sunrise & Sunset with Twilight and Daylight Saving Time in San Sebastián del Sur

Sunrise & Sunset with Twilight and Daylight Saving Time in San Sebastián del SurJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMApr 36:45 AMApr 36:45 AM8:37 PMJul 48:37 PMJul 4Nov 256:13 PMNov 256:13 PM7:54 AMOct 307:54 AMOct 30Apr 4DSTApr 4DSTDSTOct 31DSTOct 31daynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. 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.

Moon

The figure below presents a compact representation of key lunar data for 2021. 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 San Sebastián del Sur

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.

Humidity

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 San Sebastián del Sur, 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, staying within 3% of 3% throughout.

Humidity Comfort Levels in San Sebastián del Sur

Humidity Comfort Levels in San Sebastián del SurJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 260%Feb 260%Jun 225%Jun 225%NowNowhumidhumidcomfortablecomfortabledrydry
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.

Wind

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 San Sebastián del Sur experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.3 months, from February 1 to June 11, with average wind speeds of more than 5.1 miles per hour. The windiest day of the year is April 17, with an average hourly wind speed of 6.1 miles per hour.

The calmer time of year lasts for 7.6 months, from June 11 to February 1. The calmest day of the year is August 4, with an average hourly wind speed of 4.1 miles per hour.

Average Wind Speed in San Sebastián del Sur

Average Wind Speed in San Sebastián del SurwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphApr 176.1 mphApr 176.1 mphAug 44.1 mphAug 44.1 mphFeb 15.1 mphFeb 15.1 mphJun 115.1 mphJun 115.1 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in San Sebastián del Sur varies throughout the year.

The wind is most often from the south for 3.5 months, from June 17 to October 1, with a peak percentage of 40% on July 4. The wind is most often from the east for 1.1 months, from October 1 to November 3, with a peak percentage of 31% on October 5. The wind is most often from the west for 7.5 months, from November 3 to June 17, with a peak percentage of 28% on January 1.

Wind Direction in San Sebastián del Sur

Wind Direction in San Sebastián del SurWSEWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
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).

Water Temperature

San Sebastián del Sur 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 4.4 months, from June 27 to November 9, with an average temperature above 84°F. The day of the year with the warmest water is August 5, with an average temperature of 86°F.

The time of year with cooler water lasts for 2.7 months, from February 18 to May 9, with an average temperature below 79°F. The day of the year with the coolest water is March 29, with an average temperature of 77°F.

Average Water Temperature in San Sebastián del Sur

Average Water Temperature in San Sebastián del SurwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°FAug 586°FAug 586°F77°FMar 2977°FMar 29Jun 2784°FJun 2784°FNov 984°FNov 984°FFeb 1879°FFeb 1879°FMay 979°FMay 979°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in San Sebastián del Sur 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 San Sebastián del Sur for general outdoor tourist activities is from late April to early June, with a peak score in the third week of May.

Tourism Score in San Sebastián del Sur

Tourism Score in San Sebastián del Surbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.63.63.65.15.14.14.14.14.1NowNowprecipitationprecipitationcloudscloudstemperaturetemperature 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 San Sebastián del Sur for hot-weather activities is from mid April to early June, with a peak score in the third week of May.

Beach/Pool Score in San Sebastián del Sur

Beach/Pool Score in San Sebastián del Surbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.14.11.71.72.72.72.02.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
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.

Growing Season

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).

While it does not do so every year, freezing temperatures are seen in San Sebastián del Sur over some winters. The day least likely to be in the growing season is January 16, with a 76% chance.

Time Spent in Various Temperature Bands and the Growing Season in San Sebastián del Sur

Time Spent in Various Temperature Bands and the Growing Season in San Sebastián del Surgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%90%Feb 2290%Feb 2290%Dec 2290%Dec 2276%Jan 1676%Jan 16Jul 26100%Jul 26100%NowNowvery coldcoldcoolcomfortablewarmhot
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 San Sebastián del Sur should appear around January 10, only rarely appearing before January 9 or after January 12.

Growing Degree Days in San Sebastián del Sur

Growing Degree Days in San Sebastián del SurJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°FJan 1090°FJan 1090°FMar 23900°FMar 23900°FMay 121,800°FMay 121,800°FDec 315,616°FDec 315,616°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.5 months, from March 14 to May 30, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest day of the year is April 25, with an average of 7.4 kWh.

The darker period of the year lasts for 6.9 months, from June 27 to January 23, with an average daily incident shortwave energy per square meter below 5.1 kWh. The darkest day of the year is December 20, with an average of 4.5 kWh.

Average Daily Incident Shortwave Solar Energy in San Sebastián del Sur

Average Daily Incident Shortwave Solar Energy in San Sebastián del SurbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhApr 257.4 kWhApr 257.4 kWhDec 204.5 kWhDec 204.5 kWhMar 146.8 kWhMar 146.8 kWhJun 275.1 kWhJun 275.1 kWhJan 235.1 kWhJan 235.1 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.

Topography

For the purposes of this report, the geographical coordinates of San Sebastián del Sur are 19.794 deg latitude, -103.473 deg longitude, and 4,993 ft elevation.

The topography within 2 miles of San Sebastián del Sur contains very significant variations in elevation, with a maximum elevation change of 1,480 feet and an average elevation above sea level of 5,162 feet. Within 10 miles contains very significant variations in elevation (4,980 feet). Within 50 miles also contains extreme variations in elevation (13,186 feet).

The area within 2 miles of San Sebastián del Sur is covered by cropland (65%) and trees (32%), within 10 miles by trees (56%) and cropland (31%), and within 50 miles by trees (50%) and cropland (28%).

Data Sources

This report illustrates the typical weather in San Sebastián del Sur, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in San Sebastián del Sur.

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

The stations contributing to this reconstruction are: Guadalajara International Airport (MMGL, 79%, 83 kilometers, north) and Playa de Oro International Airport (MMZO, 21%, 135 kilometers, southwest).

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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.