Lake Mercer Weather Forecast

    • 31
    • 47

    Chance Rain/Snow

    • 22
    • 36

    Chance Snow

    • 14
    • 39

    Mostly Sunny

    • 14
    • 27

    Mostly Sunny

    • 29
    • 39

    Mostly Cloudy

    • 26
    • 45

    Chance Rain/Snow

Today 17 Jan Fairfax

Cloudy. Scattered rain and snow Showers in the morning. Little or no snow accumulation. Highs in the upper 40s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of precipitation 50 percent.

Tonight 17 Jan Fairfax

Mostly cloudy. A chance of rain and snow after midnight. Lows in the lower 30s. West Winds around 5 Mph, becoming northwest around 5 Mph after midnight. Chance of precipitation 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

January Temperature

Fort Belvoir (4.3 miles)

  • Lowest 5 January, 2026

    23.2 °F

  • Average January

    39.8 °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

    68.3 °F
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