South Run Park Weather Forecast

    • 10
    • 43

    Decreasing Clouds

    • 16
    • 21

    Wintry Mix

    • 18
    • 26

    Wintry Mix

    • 2
    • 27

    Mostly Sunny

    • 8
    • 25

    Partly Sunny

    • 10
    • 27

    Mostly Cloudy

Today 23 Jan Fairfax

Mostly cloudy. Highs in the lower 40s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 23 Jan Fairfax

Partly cloudy. Cold with Lows around 10 above. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Wind chill Values as low as 7 below after midnight.

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South Run Park Temperature Statistics

January Temperature

Fort Belvoir (5 miles)

  • Lowest 21 January, 2026

    12.7 °F

  • Average January

    37.3 °F

  • Highest 7 January, 2026

    64 °F

Climate (2021–Present)

Fort Belvoir (5 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.2 °F
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