Lake Mercer Weather Forecast

    • 70
    • 85

    Chance Rain Showers

    • 72
    • 88

    Rain Showers

    • 65
    • 86

    Rain Showers Likely

    • 64
    • 79

    Mostly Sunny

    • 66
    • 82

    Partly Sunny

    • 68
    • 83

    Slight Chance Thunderstorms

Today 20 Jul Fairfax

Mostly sunny. Highs in the mid 80s. Northeast Winds around 5 Mph, becoming south around 5 Mph in the afternoon.

Tonight 20 Jul Fairfax

Mostly cloudy. A chance of Showers with isolated Thunderstorms after midnight. Lows around 70. South Winds 5 to 10 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

July Temperature

Fort Belvoir (4.3 miles)

  • Lowest 13 July, 2026

    62.4 °F

  • Average July

    81.5 °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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