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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 warm 27°C (81°F), with extremes ranging from a cool 17°C (63°F) to a sizzling 40°C (105°F). Expect minimal precipitation of just 2 mm (0.1 in) over 0 days, making it an ideal time to enjoy the outdoors. With an average humidity of 70%, the climate is pleasantly humid, perfect for relaxing under the sun.

August Temperature in San Francisco

In August in San Francisco, the average temperature is 27°C (81°F), with maximums reaching up to 40°C (105°F) and minimums dropping as low as 17°C (63°F). This weather makes San Francisco an ideal destination for travelers seeking warm and pleasant conditions.

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 27°C (81°F), with highs reaching up to 40°C (105°F) and lows dropping to around 17°C (63°F).
JanFebMarAprMayJunJulAugSepOctNovDec616163666771788179746861
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 2 mm (0.1 in) during a span of 0 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 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec121014111221191512
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 70%. With an average temperature of 27°C (81°F), this humidity feels like a warm embrace that clings to the skin, making it essential to stay hydrated and plan for plenty of shade while exploring the vibrant sights and sounds.

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 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%69%61%58%61%61%63%70%75%72%72%72%
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 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 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 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810121212121212975
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 Weather16°C (61°F)12 mm (0.5 inches)71%high
February Weather16°C (62°F)10 mm (0.4 inches)69%very high
March Weather17°C (64°F)14 mm (0.6 inches)61%very high
April Weather19°C (67°F)1 mm (0.0 inches)58%extreme
May Weather19°C (67°F)1 mm (0.0 inches)61%extreme
June Weather22°C (72°F)1 mm (0.0 inches)61%extreme
July Weather26°C (79°F)2 mm (0.1 inches)63%extreme
August Weather27°C (81°F)2 mm (0.1 inches)70%extreme
September Weather26°C (79°F)11 mm (0.4 inches)75%extreme
October Weather23°C (74°F)9 mm (0.4 inches)71%very high
November Weather20°C (68°F)15 mm (0.6 inches)72%high
December Weather16°C (62°F)12 mm (0.5 inches)72%moderate

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