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August Weather in San Isidro Costa Rica

Daily high temperatures are around 81°F, rarely falling below 78°F or exceeding 85°F. The highest daily average high temperature is 81°F on August 26.

Daily low temperatures are around 69°F, rarely falling below 67°F or exceeding 73°F.

For reference, on March 23, the hottest day of the year, temperatures in San Isidro typically range from 70°F to 85°F, while on September 28, the coldest day of the year, they range from 69°F to 81°F.

Average High and Low Temperature in August in San Isidro

Average High and Low Temperature in August in San IsidroAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313166°F66°F68°F68°F70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°FJulSepAug 681°FAug 681°F70°F70°FAug 3181°FAug 3181°F69°F69°FAug 2181°FAug 2181°F69°F69°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 temperatures for the quarter of the year centered on August. 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 August in San Isidro

Average Hourly Temperature in August in San IsidroAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSepcomfortablecomfortablewarm
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.

Yaoundé, Cameroon (6,537 miles away); Salatiga, Indonesia (11,469 miles); and Claveria, Philippines (10,121 miles) are the far-away foreign places with temperatures most similar to San Isidro (view comparison).

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The month of August in San Isidro experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 94% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 93% on August 1.

The clearest day of the month is August 1, with clear, mostly clear, or partly cloudy conditions 7% of the time.

For reference, on May 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 96%, while on January 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 60%.

Cloud Cover Categories in August in San Isidro

Cloud Cover Categories in August in San IsidroAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepMay 274%May 274%Aug 17%Aug 17%Aug 315%Aug 315%Aug 116%Aug 116%Aug 216%Aug 216%mostly 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 San Isidro, the chance of a wet day over the course of August is rapidly increasing, starting the month at 45% and ending it at 51%.

For reference, the year's highest daily chance of a wet day is 52% on September 15, and its lowest chance is 11% on March 12.

Probability of Precipitation in August in San Isidro

Probability of Precipitation in August in San IsidroAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%JulSepAug 145%Aug 145%Aug 3151%Aug 3151%Aug 1147%Aug 1147%Aug 2149%Aug 2149%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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during August in San Isidro is gradually increasing, starting the month at 6.3 inches, when it rarely exceeds 11.0 inches or falls below 2.7 inches, and ending the month at 6.6 inches, when it rarely exceeds 10.6 inches or falls below 2.8 inches.

Average Monthly Rainfall in August in San Isidro

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 August in San Isidro, the length of the day is essentially constant. The shortest day of the month is August 31, with 12 hours, 18 minutes of daylight and the longest day is August 1, with 12 hours, 31 minutes of daylight.

Hours of Daylight and Twilight in August in San Isidro

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 month in San Isidro is 5:25 AM on August 1 and the latest sunrise is 1 minute, 3 seconds later at 5:26 AM on August 19.

The latest sunset is 5:56 PM on August 1 and the earliest sunset is 13 minutes earlier at 5:43 PM on August 31.

Daylight saving time is not observed in San Isidro during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:16 AM and sets 12 hours, 40 minutes later, at 5:56 PM, while on December 21, the shortest day of the year, it rises at 5:45 AM and sets 11 hours, 35 minutes later, at 5:20 PM.

Sunrise & Sunset with Twilight in August in San Isidro

Sunrise & Sunset with Twilight in August in San IsidroAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMJulSep5:25 AM5:25 AMAug 15:56 PMAug 15:56 PM5:26 AM5:26 AMAug 315:43 PMAug 315:43 PM5:26 AM5:26 AMAug 195:49 PMAug 195:49 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of August. 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 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 August in San Isidro

Solar Elevation and Azimuth in August in San IsidroAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSep0010102020203030404050505060607070800001010202030303040405050606060707080
northeastsouthwest
Solar elevation and azimuth over the course of August 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 August 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 August in San Isidro

Moon Rise, Set & Phases in August in San IsidroAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJulSepJul 54:58 PMJul 54:58 PMJul 214:18 AMJul 214:18 AMAug 45:14 AMAug 45:14 AMAug 1912:26 PMAug 1912:26 PMSep 27:56 PMSep 27:56 PMSep 178:35 PMSep 178:35 PM4:53 AM4:53 AM6:04 PM6:04 PM5:38 PM5:38 PM5:31 AM5:31 AM5:31 AM5:31 AM6:23 PM6:23 PM6:04 PM6:04 PM6:13 AM6:13 AM5:04 AM5:04 AM5:40 PM5:40 PM5:26 PM5:26 PM5:49 AM5:49 AM
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.
Aug 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
8%2:45 AMENE3:56 PMWNW-9:21 AMN240,750 mi
2
3%3:43 AMENE4:50 PMWNW-10:18 AMN242,968 mi
3
1%4:39 AMENE5:39 PMWNW-11:10 AMN245,110 mi
4
0%5:31 AMENE6:23 PMWNW-11:59 AMN247,114 mi
5
2%6:21 AMENE7:03 PMWNW-12:43 PMN248,898 mi
6
5%7:07 AME7:41 PMW-1:25 PMN250,356 mi
7
10%7:51 AME8:16 PMW-2:04 PMS251,372 mi
8
17%8:34 AME8:51 PMW-2:43 PMS251,826 mi
9
25%9:17 AME9:26 PMW-3:21 PMS251,609 mi
10
34%10:01 AMESE10:03 PMWSW-4:01 PMS250,644 mi
11
43%10:46 AMESE10:43 PMWSW-4:44 PMS248,895 mi
12
50%11:35 AMESE11:27 PMWSW-5:30 PMS246,389 mi
13
64%12:28 PMESE--6:21 PMS243,221 mi
14
74%-12:16 AMWSW1:24 PMESE7:17 PMS239,565 mi
15
83%-1:10 AMWSW2:22 PMESE8:16 PMS235,677 mi
16
91%-2:10 AMWSW3:22 PMESE9:17 PMS231,876 mi
17
96%-3:12 AMWSW4:19 PMESE10:18 PMS228,510 mi
18
100%-4:14 AMWSW5:14 PMESE11:15 PMS225,903 mi
19
100%-5:15 AMWSW6:04 PMESE--
20
100%-6:13 AMW6:52 PME12:09 AMS224,298 mi
21
97%-7:10 AMW7:37 PME1:01 AMS223,817 mi
22
91%-8:05 AMW8:23 PME1:51 AMS224,446 mi
23
82%-9:01 AMW9:09 PMENE2:40 AMS226,049 mi
24
72%-9:57 AMWNW9:57 PMENE3:31 AMN228,401 mi
25
61%-10:55 AMWNW10:49 PMENE4:25 AMN231,239 mi
26
50%-11:55 AMWNW11:44 PMENE5:20 AMN234,307 mi
27
38%-12:54 PMWNW-6:18 AMN237,386 mi
28
28%12:40 AMENE1:52 PMWNW-7:16 AMN240,317 mi
29
19%1:38 AMENE2:46 PMWNW-8:13 AMN242,998 mi
30
11%2:34 AMENE3:36 PMWNW-9:06 AMN245,377 mi
31
6%3:27 AMENE4:21 PMWNW-9:56 AMN247,437 mi

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 San Isidro is increasing during August, rising from 70% to 76% over the course of the month.

For reference, on May 31, the muggiest day of the year, there are muggy conditions 87% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 11% of the time.

Humidity Comfort Levels in August in San Isidro

Humidity Comfort Levels in August in San IsidroAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JulSepAug 170%Aug 170%Aug 3176%Aug 3176%Aug 1173%Aug 1173%Aug 2174%Aug 2174%oppressiveoppressivemuggymuggyhumidhumid
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 San Isidro is essentially constant during August, remaining within 0.2 miles per hour of 2.4 miles per hour throughout.

For reference, on October 7, the windiest day of the year, the daily average wind speed is 3.3 miles per hour, while on December 9, the calmest day of the year, the daily average wind speed is 1.9 miles per hour.

Average Wind Speed in August in San Isidro

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in San Isidro throughout August is predominantly from the west, with a peak proportion of 54% on August 31.

Wind Direction in August in San Isidro

Wind Direction in August in San IsidroAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JulSepwestsouthnortheast
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).

San Isidro 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 San Isidro is essentially constant during August, remaining around 83°F throughout.

Average Water Temperature in August in San Isidro

Average Water Temperature in August in San IsidroAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313181.0°F81.0°F81.5°F81.5°F82.0°F82.0°F82.5°F82.5°F83.0°F83.0°F83.5°F83.5°F84.0°F84.0°F84.5°F84.5°F85.0°F85.0°FJulSepAug 183°FAug 183°FAug 3183°FAug 3183°FAug 1183°FAug 1183°FAug 2183°FAug 2183°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).

Temperatures in San Isidro 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 in August in San Isidro

Time Spent in Various Temperature Bands and the Growing Season in August in San IsidroAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSep100%Aug 16100%Aug 16100%Jul 2100%Jul 2comfortablewarm
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 San Isidro are rapidly increasing during August, increasing by 716°F, from 5,303°F to 6,019°F, over the course of the month.

Growing Degree Days in August in San Isidro

The average growing degree days accumulated over the course of August, 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 San Isidro is essentially constant during August, remaining around 3.8 kWh throughout.

The highest average daily incident shortwave solar energy during August is 3.9 kWh on August 5.

Average Daily Incident Shortwave Solar Energy in August in San Isidro

Average Daily Incident Shortwave Solar Energy in August in San IsidroAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWhJulSepAug 53.9 kWhAug 53.9 kWhAug 313.8 kWhAug 313.8 kWhAug 213.8 kWhAug 213.8 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 San Isidro are 9.372 deg latitude, -83.704 deg longitude, and 2,283 ft elevation.

The topography within 2 miles of San Isidro contains very significant variations in elevation, with a maximum elevation change of 830 feet and an average elevation above sea level of 2,396 feet. Within 10 miles contains very significant variations in elevation (7,838 feet). Within 50 miles also contains extreme variations in elevation (12,520 feet).

The area within 2 miles of San Isidro is covered by grassland (54%), trees (21%), cropland (13%), and shrubs (12%), within 10 miles by trees (45%) and grassland (27%), and within 50 miles by trees (45%) and water (32%).

This report illustrates the typical weather in San Isidro, 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 Isidro.

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