Lake Mercer Weather Forecast

    • 35
    • 35

    Rain Likely

    • 33
    • 45

    Mostly Cloudy

    • 43
    • 48

    Rain Likely

    • 28
    • 63

    Chance Rain

    • 26
    • 38

    Partly Sunny

    • 26
    • 44

    Partly Sunny

Today 26 Dec Fairfax

Cloudy with a chance of rain with a slight chance of sleet. Cooler with Highs in the mid 30s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of precipitation 50 percent.

Tonight 26 Dec Fairfax

Mostly cloudy. Rain likely in the evening. Lows in the mid 30s. South Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming west after midnight. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

December Temperature

Fort Belvoir (4.3 miles)

  • Lowest 16 December, 2025

    17.1 °F

  • Average December

    36.1 °F

  • Highest 19 December, 2025

    60.3 °F

Climate (2020–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.2 °F
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