Mason Neck State Park Weather Forecast

    • 61
    • 72

    Mostly Cloudy

    • 61
    • 78

    Partly Sunny

    • 63
    • 83

    Partly Sunny

    • 66
    • 87

    Mostly Sunny

    • 66
    • 88

    Slight Chance Rain Showers

    • 64
    • 73

    Chance Rain Showers

    • 58
    • 71

    Chance Rain Showers

Today 28 Sep Fairfax

Mostly cloudy. Highs around 70. Northwest Winds around 10 Mph.

Tonight 28 Sep Fairfax

Mostly cloudy. Lows around 60. Northwest Winds 5 to 10 Mph.

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Mason Neck State Park Temperature Statistics

September Temperature

Fort Belvoir (4.3 miles)

  • Lowest 25 September, 2026

    52 °F

  • Average September

    72.7 °F

  • Highest 1 September, 2026

    96.4 °F

Climate (2021–2026)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.3 °F
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