South Run Stream Valley Park Weather Forecast

    • 30
    • 44

    Partly Sunny

    • 44
    • 47

    Chance Rain

    • 28
    • 64

    Chance Rain

    • 25
    • 36

    Partly Sunny

    • 28
    • 43

    Mostly Cloudy

    • 20
    • 41

    Mostly Cloudy

Today 27 Dec Fairfax

Partly sunny. Highs in the mid 40s. North Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 27 Dec Fairfax

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 20s. Northeast Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Real-Time

South Run Stream Valley Park Temperature Statistics

December Temperature

Fort Belvoir (3.1 miles)

  • Lowest 16 December, 2025

    17.1 °F

  • Average December

    36.5 °F

  • Highest 25 December, 2025

    61 °F

Climate (2020–Present)

Fort Belvoir (3.1 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.2 °F
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