1. WeatherSpark.com
  2. Costa Rica
  3. San José
  4. San Miguel

Average Weather in San Miguel Costa Rica

In San Miguel, the wet season is humid and overcast, the dry season is partly cloudy, and it is warm year round. Over the course of the year, the temperature typically varies from 62°F to 79°F and is rarely below 59°F or above 82°F.

Climate Summary

warmwarmJanFebMarAprMayJunJulAugSepOctNovDec63%63%4%4%overcastclearprecipitation: 6.6 inprecipitation: 6.6 in0.7 in0.7 inmuggy: 52%muggy: 52%3%3%drydrytourism score: 7.5tourism score: 7.54.44.4
Click on each chart for more information.

Based on the tourism score, the best time of year to visit San Miguel for warm-weather activities is from mid December to late March.

Temperature

The temperature in San Miguel varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

Average High and Low Temperature

Average High and Low Temperature in San MiguelJanFebMarAprMayJunJulAugSepOctNovDec0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F100°FSep 1976°FSep 1976°FApr 879°FApr 879°F62°F62°F63°F63°FMar 1078°FMar 1078°FDec 2376°FDec 2376°F62°F62°F63°F63°FLowHigh
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

Average Hourly Temperature in San MiguelJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoolwarmcoolcomfortablecomfortablecool
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Kabanjahe, Indonesia (11,536 miles away) and Kibangay, Philippines (10,102 miles) are the far-away foreign places with temperatures most similar to San Miguel (view comparison).

Clouds

In San Miguel, 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 Miguel begins around November 25 and lasts for 4.5 months, ending around April 9. On January 2, 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 April 9 and lasts for 7.5 months, ending around November 25. On June 5, the cloudiest day of the year, the sky is overcast or mostly cloudy 96% of the time, and clear, mostly clear, or partly cloudy 4% of the time.

Cloud Cover Categories

Cloud Cover Categories in San MiguelclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 263%Jan 263%Jun 54%Jun 54%Nov 2533%Nov 2533%Apr 935%Apr 935%mostly cloudyovercastclearpartly cloudymostly clear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

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 Miguel varies significantly throughout the year.

The wetter season lasts 6.9 months, from May 3 to December 1, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 52% on October 6.

The drier season lasts 5.1 months, from December 1 to May 3. The smallest chance of a wet day is 7% on March 13.

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 52% on October 6.

Daily Chance of Precipitation

Daily Chance of Precipitation in San MiguelwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Oct 652%Oct 652%Mar 137%Mar 137%Jan 114%Jan 114%May 330%May 330%Dec 130%Dec 130%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 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 Miguel experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in San Miguel. The most rain falls during the 31 days centered around October 11, with an average total accumulation of 6.6 inches.

The least rain falls around March 16, with an average total accumulation of 0.7 inches.

Average Monthly Rainfall

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 Miguel does not vary substantially over the course of the year, staying within 42 minutes of 12 hours throughout. In 2017, the shortest day is December 21, with 11 hours, 33 minutes of daylight; the longest day is June 20, with 12 hours, 42 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in San MiguelJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2012 hr, 42 minJun 2012 hr, 42 minJun 2012 hr, 7 minSep 2212 hr, 7 minSep 2211 hr, 33 minDec 2111 hr, 33 minDec 21nightnightday
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 5:14 AM on May 28, and the latest sunrise is 45 minutes later at 5:58 AM on January 27. The earliest sunset is at 5:10 PM on November 15, and the latest sunset is 51 minutes later at 6:01 PM on July 12.

Daylight saving time (DST) is not observed in San Miguel during 2017.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in San MiguelJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMMay 285:14 AMMay 285:14 AM6:01 PMJul 126:01 PMJul 12Nov 155:10 PMNov 155:10 PM5:58 AMJan 275:58 AMJan 27daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

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.

San Miguel experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.8 months, from April 12 to December 5, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The muggiest day of the year is June 2, with muggy conditions 52% of the time.

The least muggy day of the year is January 24, with muggy conditions 3% of the time.

Humidity Comfort Levels

Humidity Comfort Levels in San MiguelmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 243%Jan 243%Jun 252%Jun 252%Apr 1215%Apr 1215%Dec 515%Dec 515%muggymuggyhumidhumiddrydrycomfortablecomfortableoppressiveoppressive
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Miguel experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.5 months, from December 19 to April 2, with average wind speeds of more than 2.4 miles per hour. The windiest day of the year is February 24, with an average hourly wind speed of 3.1 miles per hour.

The calmer time of year lasts for 8.5 months, from April 2 to December 19. The calmest day of the year is June 16, with an average hourly wind speed of 1.8 miles per hour.

Average Wind Speed

Average Wind Speed in San MiguelwindyJanFebMarAprMayJunJulAugSepOctNovDec0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mph4.5 mph5.0 mphFeb 243.1 mphFeb 243.1 mphJun 161.8 mphJun 161.8 mphDec 192.4 mphDec 192.4 mphApr 22.4 mphApr 22.4 mph
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 Miguel varies throughout the year.

The wind is most often from the west for 3.0 weeks, from May 23 to June 13 and for 2.1 months, from August 28 to November 1, with a peak percentage of 51% on October 1. The wind is most often from the east for 2.5 months, from June 13 to August 28 and for 6.7 months, from November 1 to May 23, with a peak percentage of 52% on July 23.

Wind Direction

Wind Direction in San MiguelEWEWEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%eastnorthwestsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 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 Miguel 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 does not vary significantly over the course of the year, remaining within 1°F of 83°F throughout.

Average Water Temperature

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 Miguel 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 Miguel for general outdoor tourist activities is from mid December to late March, with a peak score in the first week of January.

Tourism Score

Tourism Score in San Miguelbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.57.54.44.4 precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Miguel for hot-weather activities is from mid December to mid April, with a peak score in the second week of March.

Beach/Pool Score

Beach/Pool Score in San Miguelbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468104.44.42.32.34.44.42.72.7 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/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).

Temperatures in San Miguel are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in San MiguelJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 3100%Jul 3warmcoolcomfortable
The percentage of time spent in various temperature bands: 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 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.

Growing Degree Days

Growing Degree Days in San MiguelJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°FJan 690°FJan 690°FApr 81,800°FApr 81,800°FDec 316,617°FDec 316,617°F
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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 2.4 months, from February 1 to April 14, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest day of the year is March 21, with an average of 6.8 kWh.

The darker period of the year lasts for 5.9 months, from May 20 to November 16, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest day of the year is October 11, with an average of 3.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in San MiguelbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhMar 216.8 kWhMar 216.8 kWhOct 113.7 kWhOct 113.7 kWhFeb 16.2 kWhFeb 16.2 kWhMay 204.3 kWhMay 204.3 kWhNov 164.3 kWhNov 164.3 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.

Topography

For the purposes of this report, the geographical coordinates of San Miguel are 9.871 deg latitude, -84.061 deg longitude, and 4,163 ft elevation.

The topography within 2 miles of San Miguel contains very significant variations in elevation, with a maximum elevation change of 1,132 feet and an average elevation above sea level of 4,093 feet. Within 10 miles contains very significant variations in elevation (5,830 feet). Within 50 miles also contains extreme variations in elevation (12,490 feet).

The area within 2 miles of San Miguel is covered by grassland (54%) and trees (33%), within 10 miles by trees (45%) and grassland (39%), and within 50 miles by trees (51%) and water (17%).

Data Sources

This report illustrates the typical weather in San Miguel, 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 is only a single weather station, Juan Santamaría International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Miguel.

At a distance of 21 kilometers from San Miguel, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

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

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.