Lake Mercer Weather Forecast

    • 56
    • 75

    Increasing Clouds

    • 54
    • 78

    Decreasing Clouds

    • 56
    • 76

    Mostly Sunny

    • 59
    • 81

    Mostly Sunny

    • 64
    • 86

    Mostly Sunny

    • 68
    • 91

    Partly Sunny

    • 69
    • 91

    Slight Chance Thunderstorms

Today 31 May Fairfax

Sunny. Highs in the mid 70s. Southwest Winds around 5 Mph.

Tonight 31 May Fairfax

Mostly clear this Evening, then becoming partly cloudy. A chance of Sprinkles after midnight. Lows in the mid 50s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

May Temperature

Fort Belvoir (4.3 miles)

  • Lowest 1 May, 2026

    37.4 °F

  • Average May

    64.5 °F

  • Highest 19 May, 2026

    96.6 °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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