Lake Mercer Weather Forecast

    • 46
    • 73

    Sunny

    • 43
    • 66

    Sunny

    • 54
    • 73

    Mostly Sunny

    • 54
    • 79

    Mostly Sunny

    • 53
    • 75

    Partly Sunny

    • 53
    • 72

    Partly Sunny

    • 56
    • 70

    Chance Rain Showers

Today 5 Oct Fairfax

Mostly sunny. Highs in the lower 70s. Northwest Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 5 Oct Fairfax

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

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

October Temperature

Fort Belvoir (4.3 miles)

  • Lowest 3 October, 2026

    56.1 °F

  • Average October

    68.2 °F

  • Highest 2 October, 2026

    87.4 °F

Climate (2021–2026)

Fort Belvoir (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.3 °F
Get WillyWeather+ to remove ads