South Run Park Weather Forecast

    • 69
    • 82

    Rain Showers

    • 69
    • 87

    Decreasing Clouds

    • 56
    • 80

    Mostly Sunny

    • 59
    • 81

    Mostly Sunny

    • 62
    • 82

    Mostly Sunny

    • 65
    • 85

    Mostly Sunny

    • 65
    • 86

    Chance Rain Showers

Today 12 Sep Fairfax

Cloudy with scattered Showers and Thunderstorms. Highs in the lower 80s. Southeast Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 12 Sep Fairfax

Scattered Showers with a chance of Thunderstorms this Evening, then numerous Showers with a slight chance of Thunderstorms after midnight. Lows in the upper 60s. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Run Park Temperature Statistics

September Temperature

Fort Belvoir (5 miles)

  • Lowest 8 September, 2026

    58.8 °F

  • Average September

    77 °F

  • Highest 1 September, 2026

    96.4 °F

Climate (2021–2026)

Fort Belvoir (5 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.4 °F
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