Lake Mercer Weather Forecast

    • 61
    • 83

    Mostly Sunny

    • 64
    • 85

    Partly Sunny

    • 72
    • 88

    Mostly Sunny

    • 67
    • 90

    Chance Rain Showers

    • 65
    • 84

    Mostly Sunny

    • 67
    • 86

    Partly Sunny

Today 7 Sep Fairfax

Sunny. Highs in the lower 80s. Northeast Winds around 5 Mph.

Tonight 7 Sep Fairfax

Partly cloudy in the Evening, then becoming mostly clear. Lows around 60. East Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Real-Time

Lake Mercer Temperature Statistics

September Temperature

Fort Belvoir (4.3 miles)

  • Lowest 5 September, 2026

    69.1 °F

  • Average September

    79.1 °F

  • Highest 1 September, 2026

    96.4 °F

Climate (2021–2026)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    68.4 °F
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