Lake Mercer Weather Forecast

    • 42
    • 61

    Decreasing Clouds

    • 33
    • 55

    Mostly Sunny

    • 36
    • 55

    Mostly Sunny

    • 46
    • 64

    Partly Sunny

    • 53
    • 75

    Mostly Sunny

    • 56
    • 80

    Partly Sunny

    • 59
    • 81

    Partly Sunny

Today 6 Apr Fairfax

Mostly sunny. Highs in the lower 60s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 6 Apr Fairfax

Partly cloudy in the Evening, then clearing. Lows in the lower 40s. Northwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

April Temperature

Fort Belvoir (4.3 miles)

  • Lowest 2 April, 2026

    48.4 °F

  • Average April

    67.3 °F

  • Highest 1 April, 2026

    88.5 °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

    68.3 °F
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