Mason Neck State Park Weather Forecast

    • 53
    • 72

    Becoming Sunny

    • 65
    • 85

    Partly Sunny

    • 66
    • 90

    Mostly Sunny

    • 69
    • 93

    Mostly Sunny

    • 72
    • 94

    Mostly Sunny

    • 66
    • 91

    Chance Thunderstorms

    • 59
    • 74

    Chance Thunderstorms

Today 15 May Fairfax

Mostly sunny. Highs in the lower 70s. Northwest Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 15 May Fairfax

Partly cloudy this Evening, then clearing. Lows in the lower 50s. Northwest Winds around 5 Mph this Evening, becoming light and variable.

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Mason Neck State Park Temperature Statistics

May Temperature

Fort Belvoir (4.3 miles)

  • Lowest 1 May, 2026

    37.4 °F

  • Average May

    59.9 °F

  • Highest 5 May, 2026

    85.3 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.3 °F
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