Lake Mercer Weather Forecast

    • 66
    • 87

    Mostly Sunny

    • 71
    • 96

    Mostly Sunny

    • 73
    • 96

    Mostly Sunny

    • 60
    • 95

    Rain Showers

    • 54
    • 70

    Rain Showers Likely

    • 56
    • 69

    Rain Showers Likely

    • 60
    • 74

    Rain Showers Likely

Today 17 May Fairfax

Mostly sunny with a slight chance of Thunderstorms with isolated Showers. Highs in the upper 80s. West Winds around 5 Mph. Chance of rain 20 percent.

Tonight 17 May Fairfax

Partly cloudy this Evening, then becoming mostly clear. Lows in the mid 60s. South Winds around 5 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mercer Temperature Statistics

May Temperature

Fort Belvoir (4.3 miles)

  • Lowest 1 May, 2026

    37.4 °F

  • Average May

    59.8 °F

  • Highest 5 May, 2026

    85.3 °F

Climate (2021–Present)

Fort Belvoir (4.3 miles)

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

  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.3 °F
Get WillyWeather+ to remove ads