Brillion Weather Forecast

    • 59
    • 77

    Mostly Cloudy

    • 60
    • 73

    Chance Rain Showers

    • 60
    • 72

    Chance Thunderstorms

    • 58
    • 73

    Chance Thunderstorms

    • 58
    • 74

    Chance Rain Showers

    • 56
    • 72

    Chance Rain Showers

    • 54
    • 71

    Partly Sunny

Today 18 Sep Calumet

Humid. Partly cloudy with a chance of Showers and a slight chance of Thunderstorms. Temperatures in the mid 70s. Northeast wind 5 to 10 Mph.

Tonight 18 Sep Calumet

Partly cloudy in the evening then becoming mostly cloudy. Lows around 60. East wind 5 to 10 Mph.

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Brillion Temperature Statistics

September Temperature

Manitowoc, Manitowoc County Airport (18.6 miles)

  • Lowest 8 September, 2025

    42.1 °F

  • Average September

    60 °F

  • Highest 16 September, 2025

    77 °F

Climate (2020–Present)

Manitowoc, Manitowoc County Airport (18.6 miles)

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  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    47 °F

  • Average High 2020–2025

    54.4 °F
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