Lake Mercer Weather Forecast

    • 66
    • 92

    Rain Showers Likely

    • 60
    • 81

    Partly Sunny

    • 62
    • 81

    Chance Rain Showers

    • 66
    • 86

    Partly Sunny

    • 70
    • 95

    Rain Showers Likely

    • 63
    • 86

    Chance Thunderstorms

    • 64
    • 86

    Mostly Sunny

Today 14 Jun Fairfax

Partly sunny with scattered Showers and Thunderstorms. Highs in the lower 90s. South Winds around 15 Mph. Chance of rain 30 percent.

Tonight 14 Jun Fairfax

Mostly cloudy. Showers likely with a chance of Thunderstorms this Evening, then a slight chance of Showers after midnight. Lows in the mid 60s. Southwest Winds 10 to 15 Mph, becoming west after midnight. Chance of rain 70 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

    74.6 °F

  • Highest 12 June, 2026

    98.2 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.3 °F
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