March Weather in Sunnyvale, United States

Last updated: June 24, 2025

In March, the average temperature in Sunnyvale, United States is a mild 11°C (53°F), with daily variations that can swing from a brisk 1°C (34°F) to a pleasant 26°C (79°F). Be prepared for some rain, as the area experiences an average precipitation of 114 mm (4.5 in) over 12 days. Additionally, you'll find the air quite humid, with an average humidity level of 82%.

March Temperature in Sunnyvale

In March in Sunnyvale, the average temperature is 11°C (53°F). Maximum temperatures can reach 26°C (79°F), while minimums can drop as low as 1°C (34°F). It's a great time to visit Sunnyvale for those who enjoy mild weather with a mix of warm and cool days.

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

The chart illustrates March temperature patterns in Sunnyvale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sunnyvale, March typically has an average temperature of 11°C (53°F), with highs reaching up to 26°C (79°F) and lows dropping to around 1°C (34°F).

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

March Precipitation in Sunnyvale

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

March Precipitation Trends in Sunnyvale

The chart displays monthly precipitation patterns in Sunnyvale, 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 Sunnyvale, March typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

March Humidity in Sunnyvale

In Sunnyvale in March humidity is 82%. With an average temperature of 11°C (53°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities uncomfortable and sticky, often requiring frequent breaks to escape the muggy atmosphere.

March Average Humidity in Sunnyvale

This chart illustrates the average monthly humidity levels in Sunnyvale, 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 Sunnyvale is approximately 82%, 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 Sunnyvale

In Sunnyvale 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 Sunnyvale.

Maximum UV Index Levels in Sunnyvale for March

The chart shows the monthly maximum UV Index (UVI) for Sunnyvale 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 Sunnyvale typically reaches 8, which falls under the very high exposure category.

Data source: Sunnyvale 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 Sunnyvale Compares to Other Months

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

This table compares monthly weather conditions in Sunnyvale, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	145 mm (5.7 inches)	82%	moderate
February Weather	11°C (52°F)	133 mm (5.2 inches)	84%	moderate
March Weather	11°C (53°F)	114 mm (4.5 inches)	82%	very high
April Weather	13°C (56°F)	37 mm (1.4 inches)	78%	very high
May Weather	15°C (59°F)	24 mm (0.9 inches)	71%	extreme
June Weather	18°C (64°F)	1 mm (0.0 inches)	64%	extreme
July Weather	19°C (66°F)	0 mm (0.0 inches)	58%	extreme
August Weather	19°C (67°F)	0 mm (0.0 inches)	54%	very high
September Weather	19°C (67°F)	3 mm (0.1 inches)	55%	very high
October Weather	17°C (63°F)	25 mm (1.0 inches)	62%	high
November Weather	13°C (56°F)	56 mm (2.2 inches)	78%	moderate
December Weather	10°C (50°F)	116 mm (4.6 inches)	80%	moderate