Fairfax (VA) Weather & Climate: Best Time to Visit

In Fairfax, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 30°C (86°F) in July to a chilly 6°C (43°F) in the coolest month, January.

Nights vary from 20°C (68°F) in July to around -4°C (25°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Fairfax experiences significant rain/snowfall throughout the year, averaging 1164 mm (46 in) of precipitation annually. Fairfax offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month June (138 mm (5.4 in)) and the driest month February (65 mm (2.6 in)) is not too significant. For more details, please visit our Fairfax Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, Fairfax serves as an ideal destination. Expect longer, more sun-filled days in June with an average of 9.4 hours of sunshine daily, and embrace the darker days in December, offering only 4.3 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Fairfax.

The city experiences its highest humidity in August, reaching 69%. In March, the humidity drops to its lowest level at 58%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The mean wind speed varies between 4 m/s (8 knots) and 5 m/s (10 knots) throughout the year. It is lowest in May, June, July, August, September, October, November and December and highest during January, February, March and April. What does this mean?

The mean monthly wind speed over the year (meters per second)