Lake Mercer Weather Forecast

    • 17
    • 29

    Sunny

    • 32
    • 40

    Partly Sunny

    • 27
    • 50

    Partly Sunny

    • 12
    • 39

    Chance Snow

    • 14
    • 20

    Chance Snow

    • 11
    • 22

    Chance Snow

Today 20 Jan Fairfax

Sunny. Highs in the upper 20s. West Winds 5 to 10 Mph with Gusts up to 25 Mph.

Tonight 20 Jan Fairfax

Mostly clear. Lows around 15. Northwest Winds around 5 Mph, becoming southeast after midnight.

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Lake Mercer Temperature Statistics

January Temperature

Fort Belvoir (4.3 miles)

  • Lowest 16 January, 2026

    22.5 °F

  • Average January

    38.8 °F

  • Highest 7 January, 2026

    64 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.2 °F
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