March Weather in Diamond Bar, United States

Last updated: June 24, 2025

In Diamond Bar, United States, the average temperature in March is a pleasant 14°C (57°F). Expect a range where the minimum dips to 3°C (37°F) and the maximum can reach a warm 30°C (86°F). During this month, you might encounter about 76 mm (3.0 in) of precipitation spread over 9 days, contributing to an average humidity of 75%. Enjoy the varied weather while exploring this beautiful destination!

March Temperature in Diamond Bar

In March in Diamond Bar, the average temperature is 14°C (57°F). The maximum can reach up to 30°C (86°F), while the minimum can dip as low as 3°C (37°F). This makes Diamond Bar an ideal destination for travelers looking to experience a mild climate with pleasant daytime warmth and cooler evenings.

March Weather in Diamond Bar: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Diamond Bar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Diamond Bar, March typically has an average temperature of 14°C (57°F), with highs reaching up to 30°C (86°F) and lows dropping to around 3°C (37°F).

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

March Precipitation in Diamond Bar

In Diamond Bar in March, the precipitation amount is 76 mm (3.0 in) spread over a period of 9 days.

March Precipitation Trends in Diamond Bar

The chart displays monthly precipitation patterns in Diamond Bar, 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 Diamond Bar, March typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 9 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 Diamond Bar

In Diamond Bar in March, humidity is 75%. With an average temperature of 14°C (57°F), this humidity feels like a damp blanket enveloping you, making outdoor activities somewhat uncomfortable and travel a bit sluggish, as the air feels heavy and the heat lingers close to your skin.

March Average Humidity in Diamond Bar

This chart illustrates the average monthly humidity levels in Diamond Bar, 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 Diamond Bar is approximately 75%, 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 Diamond Bar

In Diamond Bar 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 Diamond Bar.

Maximum UV Index Levels in Diamond Bar for March

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

Data source: Diamond Bar 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 Diamond Bar Compares to Other Months

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

This table compares monthly weather conditions in Diamond Bar, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	80 mm (3.1 inches)	74%	moderate
February Weather	12°C (55°F)	70 mm (2.8 inches)	79%	high
March Weather	14°C (57°F)	76 mm (3.0 inches)	75%	very high
April Weather	16°C (62°F)	27 mm (1.1 inches)	70%	very high
May Weather	18°C (64°F)	17 mm (0.7 inches)	70%	very high
June Weather	21°C (70°F)	1 mm (0.0 inches)	72%	extreme
July Weather	24°C (76°F)	1 mm (0.1 inches)	73%	extreme
August Weather	25°C (77°F)	2 mm (0.1 inches)	69%	very high
September Weather	23°C (74°F)	3 mm (0.1 inches)	68%	very high
October Weather	20°C (68°F)	12 mm (0.5 inches)	67%	high
November Weather	16°C (61°F)	26 mm (1.0 inches)	68%	moderate
December Weather	12°C (54°F)	79 mm (3.1 inches)	71%	moderate