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August Weather in South San Francisco, United States

Last updated: June 24, 2025

In South San Francisco, United States, the average temperature in August is a comfortable 16°C (61°F). Expect a minimum of 11°C (53°F) and a pleasant maximum of 27°C (81°F). With an average humidity of 87%, you'll feel the warmth, but don't worry about rain—average precipitation is just 2 mm (0.1 in) over 0 days. Enjoy the mild weather!

August Temperature in South San Francisco

In August in South San Francisco, the average temperature is 16°C (61°F). Maximums can reach 27°C (81°F), and minimums can be as low as 11°C (53°F). This mild climate makes South San Francisco an ideal destination for outdoor activities and sightseeing during this time of year.

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

The chart illustrates August temperature patterns in South 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 South San Francisco, August typically has an average temperature of 16°C (61°F), with highs reaching up to 27°C (81°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec515253555659596162605552
Data source: Temperature data for South 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 South San Francisco

In South San Francisco in August, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

August Precipitation Trends in South San Francisco

The chart displays monthly precipitation patterns in South 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 South San Francisco, August typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec1061097835203322305095
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in South San Francisco

In South San Francisco in August humidity is 87%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket wrapping around you, making outdoor exploration sticky and uncomfortable, while also adding a thickness to the air that can sap your energy and enthusiasm for sightseeing.

August Average Humidity in South San Francisco

This chart illustrates the average monthly humidity levels in South 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 South San Francisco is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%82%79%83%84%87%87%86%80%79%79%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in South San Francisco

In South San Francisco in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in South San Francisco.

Maximum UV Index Levels in South San Francisco for August

The chart shows the monthly maximum UV Index (UVI) for South 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 South San Francisco typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: South 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 South San Francisco Compares to Other Months

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

This table compares monthly weather conditions in South San Francisco, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)106 mm (4.2 inches)85%moderate
February Weather11°C (52°F)109 mm (4.3 inches)82%moderate
March Weather12°C (53°F)78 mm (3.1 inches)82%very high
April Weather13°C (55°F)35 mm (1.4 inches)79%very high
May Weather14°C (57°F)20 mm (0.8 inches)83%very high
June Weather15°C (60°F)3 mm (0.1 inches)84%extreme
July Weather15°C (60°F)3 mm (0.1 inches)87%extreme
August Weather16°C (61°F)2 mm (0.1 inches)87%very high
September Weather17°C (63°F)2 mm (0.1 inches)86%very high
October Weather16°C (60°F)30 mm (1.2 inches)80%high
November Weather13°C (56°F)50 mm (2.0 inches)79%moderate
December Weather11°C (52°F)95 mm (3.7 inches)79%moderate

Compare South San Francisco's Climate with Cities Worldwide