Lake Mercer Weather Forecast

    • 63
    • 75

    Rain Showers

    • 57
    • 66

    Rain Showers

    • 55
    • 65

    Chance Rain Showers

    • 52
    • 66

    Chance Rain Showers

    • 53
    • 65

    Partly Sunny

    • 55
    • 66

    Partly Sunny

Today 21 Sep Fairfax

Showers. Highs in the mid 70s. Northeast Winds 5 to 10 Mph. Chance of rain near 100 percent.

Tonight 21 Sep Fairfax

Cloudy. A chance of rain in the Evening, then rain with a slight chance of Thunderstorms after midnight. Lows in the lower 60s. East Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

September Temperature

Fort Belvoir (4.3 miles)

  • Lowest 15 September, 2026

    53.8 °F

  • Average September

    75.5 °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

    58.2 °F

  • Average High 2021–2026

    68.4 °F
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