Weather in Fairfax in September

General weather information about Fairfax

Average annual temperature is 14.1 °C

Absolute maximum temperature: 38.7 °C

Absolute minimum temperature: 2.3 °C

Number of sunny days: 264 days

Number of rainy days: 101 days

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* Weather data for Fairfax United States is based on climate observations for 2026 year

Fairfax air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)16.919.117.629.429.931.038.737.930.934.525.919.3
Average daytime temperature (°C)13.713.613.419.420.422.529.629.424.825.118.415.2
Average temperature (°C)9.78.39.112.614.315.919.720.117.817.413.011.0
Average night temperature (°C)6.94.56.27.810.311.612.814.413.312.58.98.0
Absolute minimum temperature (°C)2.42.32.34.07.69.410.711.610.75.83.64.2

Fairfax monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.910.812.013.214.214.814.513.612.411.210.19.6
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.97.77.911.411.812.913.112.210.89.27.85.7
Precipitation (mm)34483307135410041370163
Sunny days12149282329312927242117
Rainy days1914222810237914
Snow days000000000000

Fairfax - weather forecast by months

Fairfax weather in januaryFairfax weather in februaryFairfax weather in marchFairfax weather in aprilFairfax weather in mayFairfax weather in juneFairfax weather in julyFairfax weather in augustFairfax weather in septemberFairfax weather in octoberFairfax weather in novemberFairfax weather in december

Best time to visit Fairfax:

The best time to visit Fairfax during the most sunny months:

  • June — 12.9(h)
  • July — 13.1(h)
  • August — 12.2(h)

The largest precipitation sum in Fairfax is at

  • January — 344(mm)
  • March — 307(mm)
  • December — 163(mm)

    • Weather forecast in the closest to Fairfax admin centers

    Weather forecast in the closest towns to Fairfax

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    Frequently asked questions

    When is the best time to visit Fairfax?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Fairfax.
    What is the weather like in Fairfax?
    See average temperature, rainfall and daylight hours for Fairfax by month in the table above.
    How many sunny days does Fairfax have?
    The monthly weather statistics above show sunshine and rainfall patterns for Fairfax throughout the year.