Lake Mercer Weather Forecast

    • 61
    • 84

    Mostly Sunny

    • 64
    • 84

    Mostly Sunny

    • 70
    • 87

    Chance Rain Showers

    • 69
    • 87

    Rain Showers Likely

    • 69
    • 87

    Slight Chance Thunderstorms

    • 69
    • 87

    Partly Sunny

Today 24 Aug Fairfax

Sunny. Highs in the lower 80s. West Winds 5 to 10 Mph.

Tonight 24 Aug Fairfax

Mostly clear. Lows around 60. Northwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

August Temperature

Fort Belvoir (4.3 miles)

  • Lowest 21 August, 2026

    63.7 °F

  • Average August

    79.2 °F

  • Highest 8 August, 2026

    92.8 °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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