South Run Stream Valley Park Weather Forecast

    • 61
    • 71

    Rain Showers Likely

    • 63
    • 70

    Rain Showers

    • 62
    • 81

    Partly Sunny

    • 62
    • 87

    Mostly Sunny

    • 60
    • 79

    Partly Sunny

    • 60
    • 77

    Partly Sunny

    • 63
    • 79

    Partly Sunny

Today 16 Sep Fairfax

Showers likely with a slight chance of Thunderstorms. Highs in the upper 60s. Northeast Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 70 percent.

Tonight 16 Sep Fairfax

Showers likely with a slight chance of Thunderstorms. Lows around 60. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Run Stream Valley Park Temperature Statistics

September Temperature

Fort Belvoir (3.1 miles)

  • Lowest 9 September, 2025

    49.8 °F

  • Average September

    67.8 °F

  • Highest 6 September, 2025

    92.7 °F

Climate (2020–Present)

Fort Belvoir (3.1 miles)

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  • Average Low 2020–2025

    47.8 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    68.3 °F
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