Lake Mercer Weather Forecast

    • 32
    • 65

    Rain Showers Likely

    • 31
    • 49

    Mostly Sunny

    • 46
    • 60

    Partly Sunny

    • 54
    • 67

    Slight Chance Rain Showers

    • 61
    • 76

    Slight Chance Rain Showers

    • 62
    • 84

    Chance Rain Showers

Today 27 Mar Fairfax

Showers. Highs in the lower 60s. Temperature falling into the upper 40s late. North Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 80 percent.

Tonight 27 Mar Fairfax

Mostly cloudy with a chance of rain Showers in the Evening, then partly cloudy with a chance of Flurries after midnight. Much cooler with Lows in the lower 30s. North Winds 5 to 10 Mph. Gusts up to 25 Mph after midnight. Chance of precipitation 50 percent.

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Lake Mercer Temperature Statistics

March Temperature

Fort Belvoir (4.3 miles)

  • Lowest 13 March, 2026

    25.3 °F

  • Average March

    52 °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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