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August Weather in San Francisco, Mexico

Last updated: August 27, 2025

In August, the average temperature in San Francisco, Mexico is a pleasant 25°C (78°F). Expect a range where the minimum dips to 18°C (64°F) and the maximum can soar to 33°C (92°F). Be prepared for some rain, as the area receives an average precipitation of 191 mm (7.5 in) over 21 days, accompanied by a humidity level of 74%.

August Temperature in San Francisco

In August in San Francisco, the average temperature is 25°C (78°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 18°C (64°F). This pleasant climate makes San Francisco an ideal destination for travelers seeking comfortable weather.

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

The chart illustrates August temperature patterns in San Francisco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Francisco, August typically has an average temperature of 25°C (78°F), with highs reaching up to 33°C (92°F) and lows dropping to around 18°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec636669747878777777736864
Data source: Temperature data for San Francisco 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 Francisco

In San Francisco in August, the precipitation amount is 191 mm (7.5 in) during a span of 21 days.

August Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, 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 Francisco, August typically receives around 191 mm (7.5 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec927911211718521114119121228712762
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in San Francisco

In San Francisco in August humidity is 74%. With an average temperature of 25°C (78°F), this humidity feels like you're enveloped in a warm, thick blanket, making outdoor activities feel more strenuous and necessitating frequent breaks and hydration for comfortable travel.

August Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, 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 Francisco is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%86%83%80%82%79%72%74%84%92%91%91%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Francisco

In San Francisco 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 San Francisco.

Maximum UV Index Levels in San Francisco for August

The chart shows the monthly maximum UV Index (UVI) for San Francisco 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 Francisco typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec811121313131313131197
Data source: San Francisco 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 Francisco Compares to Other Months

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

This table compares monthly weather conditions in San Francisco, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)92 mm (3.6 inches)88%very high
February Weather19°C (66°F)79 mm (3.1 inches)86%extreme
March Weather21°C (70°F)112 mm (4.4 inches)83%extreme
April Weather23°C (74°F)117 mm (4.6 inches)80%extreme
May Weather25°C (78°F)185 mm (7.3 inches)82%extreme
June Weather25°C (78°F)210 mm (8.3 inches)79%extreme
July Weather25°C (77°F)141 mm (5.5 inches)72%extreme
August Weather25°C (78°F)191 mm (7.5 inches)74%extreme
September Weather25°C (77°F)212 mm (8.4 inches)84%extreme
October Weather23°C (74°F)287 mm (11.3 inches)92%extreme
November Weather20°C (68°F)127 mm (5.0 inches)91%very high
December Weather18°C (64°F)62 mm (2.4 inches)91%high

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