Lake Mercer Weather Forecast

    • 72
    • 93

    Rain Showers

    • 71
    • 88

    Rain Showers

    • 69
    • 86

    Rain Showers

    • 69
    • 85

    Chance Thunderstorms

    • 72
    • 90

    Chance Thunderstorms

    • 71
    • 89

    Chance Thunderstorms

    • 68
    • 85

    Chance Thunderstorms

Today 5 Jul Fairfax

Mostly sunny with scattered Showers and Thunderstorms. Some Thunderstorms may produce gusty Winds and heavy rainfall. Highs in the lower 90s. South Winds around 5 Mph. Chance of rain 30 percent.

Tonight 5 Jul Fairfax

Mostly cloudy. Showers and scattered Thunderstorms late this Evening, then scattered Showers and Thunderstorms. Lows in the lower 70s. Northeast Winds around 5 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

July Temperature

Fort Belvoir (4.3 miles)

  • Lowest 1 July, 2026

    72.3 °F

  • Average July

    87.3 °F

  • Highest 2 July, 2026

    100.2 °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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