Lake Mercer Weather Forecast

    • 45
    • 55

    Rain

    • 40
    • 50

    Rain

    • 29
    • 46

    Mostly Sunny

    • 29
    • 44

    Mostly Sunny

    • 38
    • 50

    Partly Sunny

    • 31
    • 50

    Chance Rain

    • 22
    • 40

    Chance Snow

Today 9 Jan Fairfax

Rain. Highs in the mid 50s. South Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 80 percent.

Tonight 9 Jan Fairfax

Cloudy. A chance of rain. Lows in the mid 40s. Southwest Winds 5 to 10 Mph, becoming north. Chance of rain 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

    35.5 °F

  • Highest 7 January, 2026

    64 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.2 °F
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