Lake Mercer Weather Forecast

    • 41
    • 68

    Sunny

    • 48
    • 70

    Sunny

    • 46
    • 65

    Mostly Sunny

    • 49
    • 67

    Sunny

    • 42
    • 61

    Mostly Sunny

    • 44
    • 61

    Mostly Sunny

    • 46
    • 64

    Mostly Sunny

Today 19 Oct Fairfax

Mostly sunny. Highs in the upper 60s.

Tonight 19 Oct Fairfax

Clear. Lows in the mid 40s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

October Temperature

Fort Belvoir (4.3 miles)

  • Lowest 7 October, 2026

    43 °F

  • Average October

    64.2 °F

  • Highest 14 October, 2026

    89.8 °F

Climate (2021–2026)

Fort Belvoir (4.3 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    68.3 °F
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