Mason Neck Weather Forecast

    • 35
    • 53

    Chance Rain Showers

    • 30
    • 56

    Chance Rain Showers

    • 32
    • 38

    Rain

    • 37
    • 46

    Mostly Cloudy

    • 33
    • 51

    Rain Likely

    • 21
    • 43

    Mostly Sunny

Today 24 Dec Fairfax

Sunny. Highs in the lower 50s. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 24 Dec Fairfax

Mostly cloudy. A slight chance of rain Showers after midnight. Lows in the mid 30s. Northeast Winds around 5 Mph, becoming southeast after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mason Neck Temperature Statistics

December Temperature

Fort Belvoir (3.7 miles)

  • Lowest 16 December, 2025

    17.1 °F

  • Average December

    35.3 °F

  • Highest 19 December, 2025

    60.3 °F

Climate (2020–Present)

Fort Belvoir (3.7 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.2 °F
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