Lake Mercer Weather Forecast

    • 68
    • 81

    Thunderstorms

    • 67
    • 87

    Decreasing Clouds

    • 72
    • 90

    Mostly Sunny

    • 77
    • 98

    Hot

    • 79
    • 100

    Hot

    • 77
    • 102

    Slight Chance Thunderstorms

    • 76
    • 99

    Chance Thunderstorms

Today 28 Jun Fairfax

Mostly cloudy with scattered Showers and Thunderstorms. Highs in the lower 80s. Northeast Winds around 5 Mph. Chance of rain 50 percent.

Tonight 28 Jun Fairfax

Mostly cloudy. Scattered Showers and Thunderstorms this evening. Patchy fog after midnight. Lows in the upper 60s. East Winds around 5 Mph this Evening, becoming light and variable. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

June Temperature

Fort Belvoir (4.3 miles)

  • Lowest 3 June, 2026

    49.5 °F

  • Average June

    75.2 °F

  • Highest 12 June, 2026

    98.2 °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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