Lake Mercer Weather Forecast

    • 64
    • 85

    Becoming Sunny

    • 68
    • 88

    Sunny

    • 75
    • 97

    Hot

    • 74
    • 95

    Partly Sunny

    • 73
    • 93

    Chance Rain Showers

    • 71
    • 92

    Chance Rain Showers

Today 13 Jul Fairfax

Mostly sunny. Highs in the mid 80s. Southeast Winds around 5 Mph.

Tonight 13 Jul Fairfax

Mostly clear. Lows in the mid 60s. Southeast Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

July Temperature

Fort Belvoir (4.3 miles)

  • Lowest 10 July, 2026

    70.3 °F

  • Average July

    82.5 °F

  • Highest 4 July, 2026

    101.3 °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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