Lake Mercer Weather Forecast

    • 69
    • 86

    Chance Thunderstorms

    • 70
    • 85

    Mostly Cloudy

    • 72
    • 87

    Rain Showers Likely

    • 73
    • 89

    Slight Chance Thunderstorms

    • 73
    • 89

    Chance Thunderstorms

    • 72
    • 89

    Chance Thunderstorms

Today 3 Aug Fairfax

Mostly cloudy. A slight chance of Showers and Thunderstorms in the Morning, then Showers likely with a chance of Thunderstorms in the afternoon. Highs in the mid 80s. Southwest Winds 5 to 10 Mph. Chance of rain 60 percent.

Tonight 3 Aug Fairfax

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows in the upper 60s. North Winds around 5 Mph. Chance of rain 40 percent.

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Lake Mercer Temperature Statistics

August Temperature

Fort Belvoir (4.3 miles)

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  • Average August

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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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