Williamstown Weather Forecast

    • 72
    • 93

    Isolated Thunderstorms

    • 66
    • 90

    Thunderstorms

    • 59
    • 81

    Mostly Sunny

    • 63
    • 82

    Partly Sunny

    • 69
    • 87

    Partly Sunny

    • 71
    • 91

    Chance Rain Showers

Today 4 Sep Rush

Sunny, hot with Highs in the lower 90s. West Winds around 5 Mph.

Tonight 4 Sep Rush

Mostly clear. Scattered Showers and Thunderstorms toward daybreak. Humid with Lows in the lower 70s. West Winds around 5 Mph. Chance of rain 40 percent.

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Williamstown Temperature Statistics

September Temperature

Shelbyville Municipal Airport (19.9 miles)

  • Lowest 1 September, 2026

    72 °F

  • Average September

    81.5 °F

  • Highest 1 September, 2026

    93 °F

Climate (2021–2026)

Shelbyville Municipal Airport (19.9 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    56.8 °F

  • Average High 2021–2026

    67 °F
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