Lake Mendota Weather Forecast

    • 70
    • 82

    Mostly Cloudy

    • 58
    • 80

    Chance Rain Showers

    • 56
    • 77

    Mostly Sunny

    • 62
    • 79

    Partly Sunny

    • 57
    • 80

    Slight Chance Rain Showers

    • 57
    • 76

    Chance Rain Showers

Today 8 Sep Dane

Mostly cloudy. Slight chance of light Showers late in the morning. Slight chance of light Showers and Thunderstorms in the afternoon. Highs in the lower 80s. South Winds 5 to 10 Mph. Chance of precipitation 20 percent.

Tonight 8 Sep Dane

Mostly cloudy. Chance of light Showers and Thunderstorms through around Midnight, then Showers likely and chance of Thunderstorms after midnight. Lows around 70. Southwest Winds 5 to 15 Mph. Chance of precipitation 70 percent.

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Lake Mendota Temperature Statistics

September Temperature

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

  • Lowest 5 September, 2026

    64 °F

  • Average September

    77.3 °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

    59.1 °F
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