Lake Mercer Weather Forecast

    • 50
    • 71

    Rain Showers Likely

    • 48
    • 67

    Partly Sunny

    • 55
    • 80

    Chance Rain

    • 33
    • 62

    Slight Chance Rain

    • 39
    • 53

    Mostly Cloudy

    • 42
    • 57

    Slight Chance Rain

Today 20 Mar Fairfax

Mostly cloudy. Highs in the lower 70s. Southwest Winds around 15 Mph with Gusts up to 30 Mph.

Tonight 20 Mar Fairfax

Becoming partly cloudy after midnight. Scattered Thunderstorms. Numerous Showers, mainly in the evening. Lows around 50. Southwest Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

March Temperature

Fort Belvoir (4.3 miles)

  • Lowest 13 March, 2026

    25.3 °F

  • Average March

    51 °F

  • Highest 11 March, 2026

    86.5 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    68.2 °F
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