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August Weather in San Francisco, Mexico

Last updated: August 27, 2025

In San Francisco, Mexico, the average temperature in August hovers around 28°C (83°F), providing a warm and inviting atmosphere. Expect minimums of 22°C (73°F) and maximums soaring to 35°C (96°F), perfect for sun lovers. However, be prepared for some rain, as the region sees an average precipitation of 110 mm (4.3 in) over 18 days, coupled with an average humidity of 81%. Make sure to pack accordingly to enjoy this vibrant locale!

August Temperature in San Francisco

In August in San Francisco, the average temperature is 28°C (83°F), with maximums reaching up to 35°C (96°F) and minimums dropping as low as 22°C (73°F). This warm climate makes San Francisco an ideal destination for travelers seeking pleasant weather and outdoor activities.

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 28°C (83°F), with highs reaching up to 35°C (96°F) and lows dropping to around 22°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec737677808282828281807674
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 110 mm (4.3 in) over the course of 18 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 110 mm (4.3 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec3919153989164871101481746735
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 81%. With an average temperature of 28°C (83°F), this humidity feels like walking through a warm, damp blanket, making travel feel both stifling and exhausting.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%71%70%68%69%74%81%82%83%84%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec810121313131212121187
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 Weather23°C (73°F)38 mm (1.5 inches)81%very high
February Weather24°C (76°F)19 mm (0.8 inches)78%very high
March Weather25°C (77°F)15 mm (0.6 inches)71%extreme
April Weather27°C (81°F)38 mm (1.5 inches)70%extreme
May Weather28°C (82°F)89 mm (3.5 inches)68%extreme
June Weather28°C (82°F)164 mm (6.5 inches)69%extreme
July Weather28°C (83°F)87 mm (3.4 inches)74%extreme
August Weather28°C (83°F)110 mm (4.3 inches)81%extreme
September Weather27°C (82°F)148 mm (5.8 inches)82%extreme
October Weather26°C (80°F)174 mm (6.9 inches)83%extreme
November Weather24°C (76°F)67 mm (2.6 inches)84%very high
December Weather23°C (74°F)35 mm (1.4 inches)86%high

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