Williamstown Weather Forecast

    • 56
    • 85

    Isolated Thunderstorms

    • 60
    • 77

    Mostly Sunny

    • 69
    • 90

    Slight Chance Thunderstorms

    • 69
    • 89

    Slight Chance Thunderstorms

    • 68
    • 89

    Chance Thunderstorms

    • 63
    • 84

    Chance Rain Showers

Today 13 Sep Rush

Partly cloudy. Isolated Showers and Thunderstorms late this afternoon. Highs in the mid 80s. West Winds around 5 Mph, becoming northwest with Gusts up to 20 Mph late this afternoon. Chance of rain 20 percent.

Tonight 13 Sep Rush

Partly cloudy through the late Overnight, then clearing. Cooler. Less humid with Lows in the mid 50s. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph through the late overnight.

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Williamstown Temperature Statistics

September Temperature

Shelbyville Municipal Airport (19.9 miles)

  • Lowest 7 September, 2026

    59.6 °F

  • Average September

    78.3 °F

  • Highest 4 September, 2026

    96.7 °F

Climate (2021–2026)

Shelbyville Municipal Airport (19.9 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    56.9 °F

  • Average High 2021–2026

    67 °F
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