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August Weather in San Juan, Mexico

Last updated: August 27, 2025

In August, the average temperature in San Juan, Mexico is a pleasant 25°C (76°F), perfect for outdoor activities. Expect minimum temperatures to dip to around 18°C (65°F), while highs can reach up to 32°C (90°F). Be prepared for some rain, as 255 mm (10.0 in) of precipitation is recorded over 27 days, contributing to the area's high average humidity of 83%.

August Temperature in San Juan

In August in San Juan, the average temperature is 25°C (76°F). The maximum can reach 32°C (90°F), while the minimum can be as low as 18°C (65°F). This mild and warm climate makes San Juan an ideal destination for outdoor activities and sightseeing during this month.

August Weather in San Juan: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in San Juan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan, August typically has an average temperature of 25°C (76°F), with highs reaching up to 32°C (90°F) and lows dropping to around 18°C (65°F).
JanFebMarAprMayJunJulAugSepOctNovDec636468727678767675746964
Data source: Temperature data for San Juan 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 San Juan

In San Juan in August, the precipitation amount is 255 mm (10.0 in) occurring over the course of 27 days.

August Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, 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 San Juan, August typically receives around 255 mm (10.0 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec113721273217255166681324
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in San Juan

In San Juan in August humidity is 83%. With an average temperature of 25°C (76°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities a bit more challenging and prompting frequent breaks for hydration.

August Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, 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 San Juan is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%66%61%56%61%73%82%83%83%79%77%78%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Juan

In San Juan in August, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Juan.

Maximum UV Index Levels in San Juan for August

The chart shows the monthly maximum UV Index (UVI) for San Juan 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 San Juan typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec710111313121212121186
Data source: San Juan 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 San Juan Compares to Other Months

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

This table compares monthly weather conditions in San Juan, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)11 mm (0.4 inches)74%high
February Weather18°C (65°F)37 mm (1.5 inches)66%very high
March Weather20°C (68°F)2 mm (0.1 inches)61%extreme
April Weather22°C (72°F)1 mm (0.0 inches)56%extreme
May Weather24°C (76°F)2 mm (0.1 inches)61%extreme
June Weather26°C (78°F)73 mm (2.9 inches)73%extreme
July Weather24°C (76°F)217 mm (8.6 inches)82%extreme
August Weather25°C (76°F)255 mm (10.0 inches)83%extreme
September Weather24°C (75°F)166 mm (6.5 inches)83%extreme
October Weather23°C (74°F)68 mm (2.7 inches)78%extreme
November Weather21°C (69°F)13 mm (0.5 inches)77%very high
December Weather18°C (64°F)24 mm (0.9 inches)78%high

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