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March Weather in South San Francisco, United States

Last updated: June 24, 2025

In South San Francisco, United States, the average temperature in March hovers around 12°C (53°F), with daily fluctuations ranging from a minimum of 5°C (42°F) to a pleasant maximum of 20°C (69°F). Expect about 78 mm (3.1 in) of precipitation over 10 days, accompanied by a high average humidity of 82%. Plan your attire accordingly to stay comfortable in this mild yet humid climate!

March Temperature in South San Francisco

In March in South San Francisco, the average temperature is 12°C (53°F). The maximum can reach 20°C (69°F), and the minimum can be as low as 5°C (42°F). Be sure to pack layers to ensure comfort during your travels!

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

The chart illustrates March 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, March typically has an average temperature of 12°C (53°F), with highs reaching up to 20°C (69°F) and lows dropping to around 5°C (42°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.

March Precipitation in South San Francisco

In South San Francisco in March, the precipitation amount is 78 mm (3.1 in) over the course of 10 days.

March Precipitation Trends in South San Francisco

The chart displays monthly precipitation patterns in South San Francisco, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In South San Francisco, March typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec1061097835203322305095
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in South San Francisco

In South San Francisco in March, humidity is 82%. With an average temperature of 12°C (53°F), this humidity feels like a damp blanket enveloping you, making travel uncomfortable and sticky, as you navigate through the thick air that weighs heavily on your skin.

March Average Humidity in South San Francisco

This chart illustrates the average monthly humidity levels in South San Francisco, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in South San Francisco is approximately 82%, 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 March generated using information from the Copernicus Climate Change Service.

March UV Index in South San Francisco

In South San Francisco in March, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in South San Francisco.

Maximum UV Index Levels in South San Francisco for March

The chart shows the monthly maximum UV Index (UVI) for South San Francisco in March, 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 March, the maximum UV index in South San Francisco typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: South San Francisco March 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 March 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 March’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 March’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

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