Lake Mercer Weather Forecast

    • 68
    • 92

    Chance Rain Showers

    • 62
    • 83

    Chance Rain Showers

    • 55
    • 87

    Rain Showers Likely

    • 41
    • 63

    Chance Rain Showers

    • 36
    • 56

    Mostly Sunny

    • 54
    • 67

    Partly Sunny

    • 53
    • 78

    Slight Chance Thunderstorms

Today 16 Apr Fairfax

Mostly sunny. Hot with Highs in the lower 90s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 16 Apr Fairfax

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers after midnight. Lows in the upper 60s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming northwest after midnight. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

April Temperature

Fort Belvoir (4.3 miles)

  • Lowest 9 April, 2026

    34.9 °F

  • Average April

    60 °F

  • Highest 1 April, 2026

    88.5 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.3 °F
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