Mason Neck State Park Weather Forecast

    • 19
    • 32

    Becoming Sunny

    • 28
    • 39

    Mostly Sunny

    • 30
    • 52

    Mostly Cloudy

    • 41
    • 55

    Rain

    • 26
    • 50

    Partly Sunny

    • 37
    • 45

    Partly Sunny

    • 33
    • 53

    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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Mason Neck State Park Temperature Statistics

December Temperature

Fort Belvoir (4.3 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 (4.3 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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