March Weather in Fairfax, United States

Last updated: June 24, 2025

In Fairfax, United States, the average temperature in March is a brisk 7°C (44°F). Be prepared for extremes, as temperatures can plummet to a minimum of -21°C (-5°F) or rise to a sweltering 30°C (86°F). Expect about 92 mm (3.6 in) of precipitation spread over 10 days, contributing to an average humidity of 73%.

March Temperature in Fairfax

In March in Fairfax, the average temperature is 7°C (44°F). Maximum temperatures can reach as high as 30°C (86°F), while the minimum can drop to a chilly -21°C (-5°F). Be sure to prepare for a wide range of weather conditions during your visit!

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

The chart illustrates March temperature patterns in Fairfax, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairfax, March typically has an average temperature of 7°C (44°F), with highs reaching up to 30°C (86°F) and lows dropping to around -21°C (-5°F).

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

March Precipitation in Fairfax

In Fairfax in March, the total precipitation amount is 92 mm (3.6 in), which falls over the course of 10 days.

March Precipitation Trends in Fairfax

The chart displays monthly precipitation patterns in Fairfax, 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 Fairfax, March typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 10 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 Fairfax

In Fairfax in March, humidity is 73%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your clothes, making it essential to dress in layers and carry a waterproof jacket while exploring the area.

March Average Humidity in Fairfax

This chart illustrates the average monthly humidity levels in Fairfax, 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 Fairfax is approximately 73%, 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 Fairfax

In Fairfax in March, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Fairfax, you can refer to this Hourly UV Index in Fairfax.

Maximum UV Index Levels in Fairfax for March

The chart shows the monthly maximum UV Index (UVI) for Fairfax 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 Fairfax typically reaches 6, which falls under the high exposure category.

Data source: Fairfax 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 Fairfax Compares to Other Months

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

This table compares monthly weather conditions in Fairfax, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	36 mm (1.4 inches)	76%	moderate
February Weather	-2°C (29°F)	32 mm (1.2 inches)	80%	moderate
March Weather	7°C (44°F)	92 mm (3.6 inches)	73%	high
April Weather	11°C (53°F)	84 mm (3.3 inches)	74%	very high
May Weather	18°C (65°F)	157 mm (6.2 inches)	78%	very high
June Weather	25°C (77°F)	119 mm (4.7 inches)	82%	extreme
July Weather	26°C (79°F)	112 mm (4.4 inches)	83%	very high
August Weather	24°C (76°F)	120 mm (4.7 inches)	80%	very high
September Weather	22°C (71°F)	85 mm (3.3 inches)	75%	very high
October Weather	13°C (55°F)	129 mm (5.1 inches)	75%	high
November Weather	6°C (42°F)	37 mm (1.5 inches)	82%	moderate
December Weather	1°C (35°F)	32 mm (1.3 inches)	83%	moderate