Lake Mercer Weather Forecast

    • 56
    • 75

    Mostly Sunny

    • 64
    • 81

    Mostly Sunny

    • 64
    • 86

    Chance Rain Showers

    • 60
    • 69

    Slight Chance Thunderstorms

    • 48
    • 78

    Chance Rain Showers

    • 40
    • 56

    Mostly Sunny

    • 43
    • 59

    Mostly Sunny

Today 12 Oct Fairfax

Partly sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 12 Oct Fairfax

Partly cloudy in the Evening, then clearing. Lows in the mid 50s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

October Temperature

Fort Belvoir (4.3 miles)

  • Lowest 7 October, 2026

    43 °F

  • Average October

    62.8 °F

  • Highest 2 October, 2026

    87.4 °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

    68.3 °F
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