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August Weather in Santiago, Costa Rica

Last updated: August 23, 2025

In Santiago, Costa Rica, the average temperature in August hovers around 23°C (74°F), creating a pleasant atmosphere. Daily temperatures can range from a comfortable 19°C (66°F) to a warm 30°C (85°F). However, prepare for moisture as the area sees 393 mm (15.5 in) of precipitation over the month, contributing to an average humidity of 82%.

August Temperature in Santiago

In August in Santiago, the average temperature is 23°C (74°F). Maximums can reach 30°C (85°F), while minimums can drop to as low as 19°C (66°F). This pleasant climate makes Santiago an ideal destination for outdoor activities and sightseeing.

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 23°C (74°F), with highs reaching up to 30°C (85°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec747576767575757473737374
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 393 mm (15.5 in) over a span of 30 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 393 mm (15.5 inches) of precipitation spread over approximately 30 days.
JanFebMarAprMayJunJulAugSepOctNovDec28131811841239729739346163925172
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 23°C (74°F), this humidity feels like you are walking through a warm, damp blanket, making travel a bit uncomfortable and sticky as you navigate the air thick with moisture.

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.
JanFebMarAprMayJunJulAugSepOctNovDec121315151414141313141210
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 Weather23°C (74°F)28 mm (1.1 inches)68%extreme
February Weather24°C (76°F)13 mm (0.5 inches)68%extreme
March Weather25°C (77°F)18 mm (0.7 inches)66%extreme
April Weather24°C (76°F)118 mm (4.6 inches)67%extreme
May Weather24°C (75°F)412 mm (16.2 inches)69%extreme
June Weather24°C (75°F)397 mm (15.6 inches)84%extreme
July Weather24°C (75°F)296 mm (11.7 inches)85%extreme
August Weather23°C (74°F)393 mm (15.5 inches)82%extreme
September Weather23°C (74°F)461 mm (18.2 inches)81%extreme
October Weather23°C (73°F)639 mm (25.2 inches)80%extreme
November Weather23°C (74°F)251 mm (9.9 inches)80%extreme
December Weather23°C (74°F)72 mm (2.8 inches)72%very high

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