Lake Mendota Weather Forecast

    • 54
    • 74

    Rain Showers

    • 59
    • 71

    Chance Rain Showers

    • 58
    • 76

    Chance Rain Showers

    • 61
    • 73

    Rain Showers

    • 58
    • 77

    Chance Thunderstorms

    • 52
    • 70

    Slight Chance Thunderstorms

Today 15 Sep Dane

Showers and slight chance of Thunderstorms in the Morning, then chance of light Showers late in the morning. Highs in the mid 70s. Southwest Winds 5 to 15 Mph. Chance of precipitation near 100 percent.

Tonight 15 Sep Dane

Mostly cloudy. Lows in the mid 50s. North Winds up to 10 Mph.

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Lake Mendota Temperature Statistics

September Temperature

Madison, Dane County Regional-Truax Field (4.3 miles)

  • Lowest 7 September, 2026

    55.7 °F

  • Average September

    72.8 °F

  • Highest 2 September, 2026

    88.6 °F

Climate (2021–2026)

Madison, Dane County Regional-Truax Field (4.3 miles)

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  • Average Low 2021–2026

    39.9 °F

  • Average 2021–2026

    49.8 °F

  • Average High 2021–2026

    59.2 °F
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