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March Weather in California, United States

Last updated: June 24, 2025

In March, the average temperature in California, United States hovers around 8°C (47°F). While the mercury can dip as low as -16°C (3°F), it can also soar to a pleasant 29°C (85°F). Expect 114 mm (4.5 in) of precipitation over approximately 12 days, and enjoy a comfortable average humidity of 75%.

March Temperature in California

In March in California, the average temperature is 8°C (47°F). Maximum temperatures can reach 29°C (85°F), while minimums can drop as low as -16°C (3°F). Be prepared for a wide range of weather conditions when traveling during this time.

March Weather in California: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in California, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In California, March typically has an average temperature of 8°C (47°F), with highs reaching up to 29°C (85°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec323547546676807672584539
Data source: Temperature data for California 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 California

In California in March, the precipitation amount is 114 mm (4.5 in) spread over 12 days.

March Precipitation Trends in California

The chart displays monthly precipitation patterns in California, 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 California, March typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec6860114124176113115106611075638
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in California

In California in March humidity is 75%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities quite uncomfortable and requiring you to bundle up to stay warm while navigating the misty streets.

March Average Humidity in California

This chart illustrates the average monthly humidity levels in California, 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 California is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in California

In California in March, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in California.

Maximum UV Index Levels in California for March

The chart shows the monthly maximum UV Index (UVI) for California 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 California typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109743
Data source: California 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 California Compares to Other Months

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

This table compares monthly weather conditions in California, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)68 mm (2.7 inches)80%moderate
February Weather1°C (35°F)60 mm (2.4 inches)78%moderate
March Weather8°C (47°F)114 mm (4.5 inches)75%high
April Weather12°C (55°F)124 mm (4.9 inches)77%very high
May Weather19°C (67°F)175 mm (6.9 inches)82%very high
June Weather25°C (77°F)113 mm (4.4 inches)83%extreme
July Weather26°C (80°F)115 mm (4.5 inches)81%extreme
August Weather25°C (77°F)106 mm (4.2 inches)78%very high
September Weather22°C (73°F)61 mm (2.4 inches)72%very high
October Weather14°C (58°F)107 mm (4.2 inches)72%high
November Weather7°C (45°F)56 mm (2.2 inches)84%moderate
December Weather4°C (39°F)38 mm (1.5 inches)86%moderate

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