Lake Mercer Weather Forecast

    • 56
    • 79

    Mostly Sunny

    • 58
    • 79

    Mostly Sunny

    • 63
    • 85

    Mostly Sunny

    • 68
    • 88

    Mostly Sunny

    • 67
    • 88

    Chance Rain Showers

    • 67
    • 86

    Slight Chance Rain Showers

Today 14 Sep Fairfax

Sunny. Highs around 80. North Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 14 Sep Fairfax

Mostly clear. Lows in the mid 50s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

September Temperature

Fort Belvoir (4.3 miles)

  • Lowest 8 September, 2026

    58.8 °F

  • Average September

    76.7 °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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