South Run Park Weather Forecast

    • 29
    • 36

    Increasing Clouds

    • 32
    • 47

    Slight Chance Rain

    • 26
    • 41

    Partly Sunny

    • 29
    • 39

    Slight Chance Snow

    • 28
    • 43

    Chance Snow

    • 17
    • 35

    Mostly Sunny

Today 9 Dec Fairfax

Mostly sunny. Highs in the mid 30s. Northeast Winds around 5 Mph, becoming south with Gusts up to 20 Mph this afternoon.

Tonight 9 Dec Fairfax

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 20s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Run Park Temperature Statistics

December Temperature

Fort Belvoir (5 miles)

  • Lowest 4 December, 2025

    25.2 °F

  • Average December

    35 °F

  • Highest 4 December, 2025

    47.5 °F

Climate (2020–Present)

Fort Belvoir (5 miles)

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  • Average Low 2020–2025

    47.8 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.3 °F
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