Lake Mercer Weather Forecast

    • 27
    • 59

    Rain Showers

    • 36
    • 45

    Mostly Sunny

    • 25
    • 50

    Partly Sunny

    • 28
    • 40

    Mostly Cloudy

    • 37
    • 46

    Mostly Cloudy

    • 38
    • 52

    Mostly Cloudy

Today 19 Dec Fairfax

Mostly cloudy with Showers with isolated Thunderstorms in the Morning, then mostly sunny in the afternoon. Breezy with Highs in the upper 50s. Temperature falling to around 40 in the afternoon. West Winds 15 to 25 Mph. Gusts up to 35 Mph, increasing to 50 Mph in the afternoon. Chance of rain 90 percent.

Tonight 19 Dec Fairfax

Mostly clear and Blustery. Lows in the upper 20s. Northwest Winds 20 to 25 Mph with Gusts up to 50 Mph, Diminishing to 5 to 10 Mph with Gusts up to 25 Mph after midnight.

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Lake Mercer Temperature Statistics

December Temperature

Fort Belvoir (4.3 miles)

  • Lowest 16 December, 2025

    17.1 °F

  • Average December

    33.4 °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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