Lake Mercer Weather Forecast

    • 49
    • 63

    Decreasing Clouds

    • 52
    • 72

    Mostly Sunny

    • 64
    • 84

    Mostly Sunny

    • 66
    • 90

    Partly Sunny

    • 69
    • 95

    Mostly Sunny

    • 72
    • 95

    Mostly Sunny

    • 69
    • 95

    Chance Thunderstorms

Today 14 May Fairfax

Mostly cloudy with scattered Sprinkles. Highs in the lower 60s. Northwest Winds around 15 Mph with Gusts up to 25 Mph.

Tonight 14 May Fairfax

Partly cloudy with scattered Sprinkles in the Evening, then mostly clear after midnight. Lows in the upper 40s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

May Temperature

Fort Belvoir (4.3 miles)

  • Lowest 1 May, 2026

    37.4 °F

  • Average May

    59.6 °F

  • Highest 5 May, 2026

    85.3 °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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