Lake Mercer Weather Forecast

    • 25
    • 44

    Partly Sunny

    • 23
    • 43

    Partly Sunny

    • 26
    • 35

    Chance Wintry Mix

    • 30
    • 43

    Mostly Cloudy

    • 28
    • 42

    Mostly Cloudy

    • 23
    • 37

    Partly Sunny

    • 29
    • 39

    Mostly Cloudy

Today 3 Dec Fairfax

Mostly sunny. Highs in the mid 40s. Southwest Winds around 5 Mph.

Tonight 3 Dec Fairfax

Mostly clear. Lows in the mid 20s. South Winds around 5 Mph, becoming west around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

December Temperature

Fort Belvoir (4.3 miles)

  • Lowest 1 December, 2025

    27.1 °F

  • Average December

    36.8 °F

  • Highest 1 December, 2025

    47.1 °F

Climate (2020–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2020–2025

    47.8 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    68.3 °F
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