Gainesville Weather Forecast

    • 59
    • 82

    Increasing Clouds

    • 61
    • 86

    Partly Sunny

    • 60
    • 84

    Mostly Cloudy

    • 59
    • 80

    Chance Rain Showers

    • 58
    • 77

    Chance Rain Showers

    • 60
    • 83

    Slight Chance Thunderstorms

Today 13 Sep Northwest Prince William

Sunny. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 13 Sep Northwest Prince William

Mostly clear in the Evening, then becoming partly cloudy. Lows around 60. South Winds around 5 Mph.

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Gainesville Temperature Statistics

September Temperature

Manassas, Manassas Regional Airport/Harry P. Davis Field (7.5 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    67.4 °F

  • Highest 6 September, 2025

    91 °F

Climate (2020–Present)

Manassas, Manassas Regional Airport/Harry P. Davis Field (7.5 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    57 °F

  • Average High 2020–2025

    68 °F
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