TODAY SEP22
TEMPERATURE73
HUMIDITY71
PRESSURE30.14
WIND COND.330 11.4
  • 6359Sun70%50%
  • 6863Mon50%70%
  • 7868Tue70%50%
  • 8263Wed40%50%
  • 7462Thu50%50%
daynightWeather update from Washington/Dulles International Airport, DC at
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Fairfax Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January24°F46°F34°F2.7"
February25°F48°F36°F2.1"
March33°F58°F45°F3.2"
April43°F71°F56°F3.7"
May52°F78°F65°F5.6"
June61°F86°F74°F4.5"
July66°F90°F78°F4.2"
August65°F88°F76°F2.8"
September58°F82°F69°F3.5"
October46°F71°F58°F5.4"
November35°F59°F46°F2.6"
December29°F50°F39°F3.8"

Did you know?

  • The highest monthly average temperature in Fairfax for July is 78 degrees.
  • The lowest monthly average temperature in Fairfax for January is 34 degrees.
  • The most monthly precipitation in Fairfax occurs in May with 5.6 inches.
  • The air quality index in Fairfax is 1% better than the national average.
  • The pollution index in Fairfax is 92% better than the national average.

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Compare Fairfax, VA Weather To Other Cities

Fairfax air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexFairfaxVirginiaNational
Air quality index495850
Pollution index380,1241,533,7925,066,862

Fairfax air quality information

MeasurementTotal
Days measured365
Days with good air quality194
Days with moderate air quality166
Days w/ poor A.Q. for sensitive groups5
Days with unhealthy air quality

Fairfax air quality information

PollutantTotal
Arsenic0.003%
Benzene0.005%
Carbon Tetrachloride0.001%
Lead0.001%
Mercury0.000%

Average monthly Fairfax temperature with heat index

Fairfax monthly precipitation with daily maximum

Fairfax monthly snow depth with daily maximum

Fairfax monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Great Falls, VA15,786492%
Herndon, VA24,415492%
Independent Hill, VA8,684492%
Lake Barcroft, VA9,851492%
Loch Lomond, VA4,151492%
Fairfax, VA23,620492%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Greenbelt, MD23,623492%
Palm Springs, FL23,5922942%
North Laurel, MD23,590468%
Marshall, TX23,6513922%
Mequon, WI23,6634510%
Fairfax, VA23,620492%
Source: The Fairfax, VA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.