Mason Neck State Park Weather Forecast

    • 69
    • 88

    Mostly Sunny

    • 73
    • 90

    Mostly Sunny

    • 77
    • 97

    Hot

    • 75
    • 95

    Chance Thunderstorms

    • 74
    • 89

    Chance Thunderstorms

    • 74
    • 89

    Chance Rain Showers

Today 23 Jul Fairfax

Patchy fog in the morning. Mostly sunny. Highs in the upper 80s. Southeast Winds 5 to 10 Mph.

Tonight 23 Jul Fairfax

Partly cloudy. Patchy fog. Lows in the upper 60s. East Winds around 5 Mph.

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Mason Neck State Park Temperature Statistics

July Temperature

Fort Belvoir (4.3 miles)

  • Lowest 5 July, 2025

    61.7 °F

  • Average July

    80.7 °F

  • Highest 8 July, 2025

    96.3 °F

Climate (2020–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2020–2025

    48 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    68.4 °F
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