March Weather in Fairfax, United States

Last updated: June 24, 2025

In March, the average temperature in Fairfax, United States is a cool 11°C (52°F). Expect temperature extremes, with a chilly minimum of -13°C (9°F) and the possibility of warm highs reaching 34°C (93°F). This month also brings about 97 mm (3.8 in) of precipitation over approximately 10 days, paired with an average humidity of 71%. Be prepared for a mix of weather as you explore!

March Temperature in Fairfax

In March in Fairfax, the average temperature is 11°C (52°F), with maximums reaching up to 34°C (93°F) and minimums dipping as low as -13°C (9°F). This wide range of temperatures means that travelers should be prepared for both warm and chilly conditions during their 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 11°C (52°F), with highs reaching up to 34°C (93°F) and lows dropping to around -13°C (9°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 97 mm (3.8 in) over a span 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 97 mm (3.8 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 71%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that seeps into your clothes, making outdoor exploration less enjoyable and encouraging frequent breaks in cozy cafes or sheltered spots.

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 71%, 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 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 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 7, 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	3°C (38°F)	57 mm (2.3 inches)	77%	moderate
February Weather	4°C (39°F)	43 mm (1.7 inches)	76%	high
March Weather	11°C (52°F)	97 mm (3.8 inches)	71%	high
April Weather	15°C (59°F)	104 mm (4.1 inches)	73%	very high
May Weather	20°C (69°F)	160 mm (6.3 inches)	83%	very high
June Weather	26°C (79°F)	101 mm (4.0 inches)	83%	extreme
July Weather	28°C (82°F)	80 mm (3.2 inches)	81%	extreme
August Weather	27°C (80°F)	103 mm (4.1 inches)	73%	very high
September Weather	24°C (76°F)	88 mm (3.4 inches)	67%	very high
October Weather	16°C (61°F)	121 mm (4.8 inches)	72%	high
November Weather	9°C (49°F)	34 mm (1.3 inches)	82%	moderate
December Weather	6°C (43°F)	35 mm (1.4 inches)	85%	moderate