Middle Run Stream Valley Park Weather Forecast

    • 19
    • 31

    Becoming Sunny

    • 27
    • 38

    Mostly Sunny

    • 30
    • 51

    Mostly Cloudy

    • 40
    • 55

    Rain

    • 26
    • 49

    Partly Sunny

    • 36
    • 44

    Partly Sunny

    • 32
    • 52

    Slight Chance Rain

Today 15 Dec Fairfax

Partly sunny. Highs in the lower 30s. Southwest Winds around 5 Mph.

Tonight 15 Dec Fairfax

Mostly clear. Lows around 18. Southwest Winds around 5 Mph.

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  • Temperature Real-Time

Middle Run Stream Valley Park Temperature Statistics

December Temperature

Fort Belvoir (3.7 miles)

  • Lowest 9 December, 2025

    17.4 °F

  • Average December

    34.8 °F

  • Highest 4 December, 2025

    47.5 °F

Climate (2020–Present)

Fort Belvoir (3.7 miles)

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  • Average Low 2020–2025

    47.8 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.2 °F
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