Lake Mercer Weather Forecast

    • 41
    • 61

    Rain

    • 36
    • 54

    Rain/Snow

    • 32
    • 41

    Rain

    • 27
    • 39

    Slight Chance Snow

    • 28
    • 39

    Mostly Cloudy

    • 41
    • 47

    Chance Rain

Today 20 Feb Fairfax

Areas of fog in the morning. Rain in the Morning, then partly sunny in the afternoon. Highs in the lower 60s. East Winds around 5 Mph, becoming southwest with Gusts up to 20 Mph in the afternoon. Chance of rain near 100 percent.

Tonight 20 Feb Fairfax

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 40s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

February Temperature

Fort Belvoir (4.3 miles)

  • Lowest 9 February, 2026

    9.9 °F

  • Average February

    31.2 °F

  • Highest 14 February, 2026

    56.7 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    68.2 °F
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