Roscoe Weather Forecast

    • 56
    • 75

    Rain Showers

    • 60
    • 72

    Chance Rain Showers

    • 58
    • 77

    Chance Rain Showers

    • 61
    • 76

    Chance Rain Showers

    • 58
    • 79

    Rain Showers Likely

    • 52
    • 71

    Chance Rain Showers

Today 15 Sep Winnebago

Showers and a slight chance of Thunderstorms in the Morning, then a slight chance of Showers in the afternoon. A slight chance of Thunderstorms late. Highs in the upper 70s. Southwest Winds 10 to 15 Mph, becoming west 5 to 10 Mph in the afternoon. Chance of precipitation near 100 percent.

Tonight 15 Sep Winnebago

Mostly cloudy. A slight chance of Showers after midnight. Less humid with Lows in the upper 50s. North Winds around 5 Mph. Chance of precipitation 20 percent.

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Roscoe Temperature Statistics

September Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 13 September, 2026

    50 °F

  • Average September

    69.2 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (14.3 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.3 °F
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