South Run Stream Valley Park Weather Forecast

    • 53
    • 83

    Chance Rain Showers

    • 44
    • 66

    Chance Rain

    • 53
    • 71

    Mostly Sunny

    • 54
    • 73

    Rain Showers

    • 51
    • 70

    Mostly Sunny

    • 56
    • 74

    Partly Sunny

    • 61
    • 83

    Partly Sunny

Today 10 May Fairfax

Numerous Showers and scattered Thunderstorms. Highs in the lower 80s. West Winds around 10 Mph. Chance of rain 70 percent.

Tonight 10 May Fairfax

Mostly cloudy. Numerous Showers and scattered Thunderstorms this evening. Lows in the lower 50s. North Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Run Stream Valley Park Temperature Statistics

May Temperature

Fort Belvoir (3.1 miles)

  • Lowest 1 May, 2026

    37.4 °F

  • Average May

    59.2 °F

  • Highest 5 May, 2026

    85.3 °F

Climate (2021–Present)

Fort Belvoir (3.1 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.3 °F
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