March Weather in Fairfax, United States

Last updated: June 24, 2025

In Fairfax, United States, the average temperature in March hovers around 0°C (33°F). Expect a wide range, with minimum temperatures dipping to -28°C (-18°F) and maximums reaching up to 25°C (77°F). The month brings about 62 mm (2.5 in) of precipitation over 7 days, contributing to an average humidity of 85%.

March Temperature in Fairfax

In March in Fairfax, the average temperature is 0°C (33°F). Maximums can reach 25°C (77°F), and minimums can be as low as -28°C (-18°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm and cold weather.

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 0°C (33°F), with highs reaching up to 25°C (77°F) and lows dropping to around -28°C (-18°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 precipitation amount is 62 mm (2.5 in) over a period of 7 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 62 mm (2.5 inches) of precipitation spread over approximately 7 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 85%. With an average temperature of 0°C (33°F), this humidity feels like a heavy blanket, making the air feel colder and more biting, while creating an uncomfortable clamminess that can dampen the thrill of traveling.

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 85%, 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 reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the 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 5, which falls under the moderate 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	-9°C (16°F)	26 mm (1.0 inches)	87%	moderate
February Weather	-9°C (16°F)	27 mm (1.1 inches)	90%	moderate
March Weather	0°C (33°F)	62 mm (2.5 inches)	85%	moderate
April Weather	6°C (43°F)	80 mm (3.1 inches)	84%	very high
May Weather	15°C (60°F)	124 mm (4.9 inches)	78%	very high
June Weather	22°C (72°F)	106 mm (4.2 inches)	80%	very high
July Weather	23°C (74°F)	123 mm (4.8 inches)	81%	very high
August Weather	21°C (71°F)	124 mm (4.9 inches)	81%	very high
September Weather	18°C (65°F)	118 mm (4.6 inches)	81%	very high
October Weather	9°C (48°F)	97 mm (3.8 inches)	84%	moderate
November Weather	1°C (34°F)	30 mm (1.2 inches)	88%	moderate
December Weather	-4°C (24°F)	40 mm (1.6 inches)	84%	low