Colchester Weather Forecast

    • 59
    • 69

    Chance Rain

    • 61
    • 66

    Chance Rain

    • 62
    • 71

    Mostly Cloudy

    • 60
    • 75

    Partly Sunny

    • 62
    • 79

    Partly Sunny

    • 65
    • 80

    Partly Sunny

Today 26 Sep Fairfax

Mostly sunny in the Morning, then cloudy with a chance of rain in the afternoon. Highs in the upper 60s. North Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of rain 50 percent.

Tonight 26 Sep Fairfax

Cloudy with a 50 percent chance of rain. Lows in the upper 50s. Northwest Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.

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Colchester Temperature Statistics

September Temperature

Fort Belvoir (3.7 miles)

  • Lowest 15 September, 2026

    53.8 °F

  • Average September

    74.1 °F

  • Highest 1 September, 2026

    96.4 °F

Climate (2021–2026)

Fort Belvoir (3.7 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.4 °F
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