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August Weather in Santiago, Costa Rica

Last updated: August 23, 2025

In August, the average temperature in Santiago, Costa Rica is a pleasant 22°C (71°F), with a minimum of 18°C (64°F) and a maximum reaching 27°C (82°F). Expect a considerable precipitation amount of 762 mm (30.0 in) over the course of 31 days, accompanied by high average humidity levels of 82%, making for a humid environment.

August Temperature in Santiago

In August in Santiago, the average temperature is 22°C (71°F). The maximum can reach 27°C (82°F), and the minimum can be as low as 18°C (64°F). This mild and pleasant weather makes it an ideal time for travelers to explore and enjoy outdoor activities in Santiago.

August Weather in Santiago: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Santiago, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santiago, August typically has an average temperature of 22°C (71°F), with highs reaching up to 27°C (82°F) and lows dropping to around 18°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec707172727272717171707070
Data source: Temperature data for Santiago generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Santiago

In Santiago in August, the total precipitation amount is 762 mm (30.0 in) spread over a period of 31 days.

August Precipitation Trends in Santiago

The chart displays monthly precipitation patterns in Santiago, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Santiago, August typically receives around 762 mm (30.0 inches) of precipitation spread over approximately 31 days.
JanFebMarAprMayJunJulAugSepOctNovDec1166574253706651683762853873503253
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Santiago

In Santiago in August, humidity is 82%. With an average temperature of 22°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and sweat-dripping, urging travelers to stay hydrated and seek the shade more often.

August Average Humidity in Santiago

This chart illustrates the average monthly humidity levels in Santiago, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Santiago is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec68%68%66%67%69%84%85%82%81%80%80%73%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Santiago

In Santiago in August, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Santiago.

Maximum UV Index Levels in Santiago for August

The chart shows the monthly maximum UV Index (UVI) for Santiago in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Santiago typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111314141514141313131110
Data source: Santiago August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Santiago Compares to Other Months

Weather in Santiago varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Santiago, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Santiago, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (71°F)116 mm (4.6 inches)68%extreme
February Weather22°C (71°F)65 mm (2.5 inches)68%extreme
March Weather22°C (72°F)74 mm (2.9 inches)66%extreme
April Weather22°C (72°F)253 mm (10.0 inches)67%extreme
May Weather22°C (72°F)706 mm (27.8 inches)69%extreme
June Weather22°C (72°F)651 mm (25.6 inches)84%extreme
July Weather22°C (72°F)682 mm (26.9 inches)85%extreme
August Weather22°C (71°F)762 mm (30.0 inches)82%extreme
September Weather21°C (71°F)853 mm (33.6 inches)81%extreme
October Weather21°C (70°F)873 mm (34.4 inches)80%extreme
November Weather21°C (71°F)503 mm (19.8 inches)80%extreme
December Weather21°C (71°F)253 mm (10.0 inches)72%very high

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