Lake Mercer Weather Forecast

    • 42
    • 61

    Increasing Clouds

    • 56
    • 75

    Partly Sunny

    • 49
    • 70

    Mostly Sunny

    • 59
    • 73

    Partly Sunny

    • 63
    • 83

    Mostly Cloudy

    • 67
    • 89

    Partly Sunny

    • 69
    • 92

    Mostly Cloudy

Today 9 Apr Fairfax

Mostly sunny. Highs in the lower 60s. South Winds around 5 Mph.

Tonight 9 Apr Fairfax

Mostly clear. Lows in the lower 40s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

April Temperature

Fort Belvoir (4.3 miles)

  • Lowest 7 April, 2026

    42.3 °F

  • Average April

    62.8 °F

  • Highest 1 April, 2026

    88.5 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.3 °F
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