March Weather in California, United States

Last updated: June 24, 2025

In March, the average temperature in California, United States is a brisk 6°C (43°F). This month brings a wide range of temperatures, with minima dipping as low as -15°C (5°F) and maxima reaching up to 26°C (79°F). Expect 117 mm (4.6 in) of precipitation spread over about 13 days, contributing to the average humidity of 88%.

March Temperature in California

In March in California, the average temperature is 6°C (43°F). Maximum can reach 26°C (79°F) and minimum can be as low as -15°C (5°F). Travelers should be prepared for a wide range of temperatures, from chilly to warm, making layering essential for comfort during their visit.

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 6°C (43°F), with highs reaching up to 26°C (79°F) and lows dropping to around -15°C (5°F).

Data source: Temperature data for California generated using information from the Copernicus Climate Change Service.

March Precipitation in California

In California in March, the total precipitation amount is 117 mm (4.6 in) spread over 13 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 117 mm (4.6 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

March Humidity in California

In California in March, humidity is 88%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and prompting you to seek warm shelter frequently.

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 88%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	87 mm (3.4 inches)	88%	moderate
February Weather	2°C (37°F)	124 mm (4.9 inches)	88%	moderate
March Weather	6°C (43°F)	117 mm (4.6 inches)	88%	high
April Weather	11°C (53°F)	129 mm (5.1 inches)	86%	very high
May Weather	17°C (63°F)	149 mm (5.9 inches)	82%	very high
June Weather	21°C (70°F)	172 mm (6.8 inches)	84%	very high
July Weather	24°C (75°F)	153 mm (6.0 inches)	82%	very high
August Weather	23°C (73°F)	110 mm (4.3 inches)	73%	very high
September Weather	20°C (68°F)	125 mm (4.9 inches)	73%	very high
October Weather	14°C (58°F)	121 mm (4.8 inches)	81%	high
November Weather	6°C (43°F)	86 mm (3.4 inches)	89%	moderate
December Weather	3°C (38°F)	116 mm (4.6 inches)	86%	moderate