Lake Mercer Weather Forecast

    • 74
    • 90

    Isolated Thunderstorms

    • 77
    • 95

    Slight Chance Thunderstorms

    • 77
    • 96

    Slight Chance Thunderstorms

    • 74
    • 97

    Chance Rain Showers

    • 69
    • 90

    Chance Rain Showers

    • 66
    • 86

    Slight Chance Thunderstorms

Today 31 Aug Fairfax

Mostly sunny. Scattered Showers and Thunderstorms in the afternoon. Highs around 90. North Winds around 5 Mph. Chance of rain 50 percent.

Tonight 31 Aug Fairfax

Mostly cloudy with scattered Showers and Thunderstorms in the Evening, then mostly clear with a slight chance of Showers after midnight. Lows in the mid 70s. Southeast Winds around 5 Mph, becoming southwest after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

August Temperature

Fort Belvoir (4.3 miles)

  • Lowest 24 August, 2026

    58.8 °F

  • Average August

    78 °F

  • Highest 8 August, 2026

    92.8 °F

Climate (2021–2026)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    68.3 °F
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