Roscoe Weather Forecast

    • 65
    • 81

    Rain Showers Likely

    • 46
    • 76

    Chance Thunderstorms

    • 40
    • 63

    Partly Sunny

    • 45
    • 63

    Mostly Cloudy

    • 49
    • 68

    Slight Chance Rain Showers

    • 52
    • 76

    Partly Sunny

Today 18 May Winnebago

Mostly cloudy. Showers likely and a chance of Thunderstorms in the Morning, then a slight chance of Showers and Thunderstorms in the afternoon. Breezy. Highs in the lower 80s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation 70 percent.

Tonight 18 May Winnebago

Mostly cloudy. A slight chance of Showers and Thunderstorms early in the evening. Showers likely with a chance of Thunderstorms after midnight. Breezy with Lows in the mid 60s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation 70 percent.

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Roscoe Temperature Statistics

May Temperature

Janesville-Rock County (14.3 miles)

  • Lowest 2 May, 2026

    30.2 °F

  • Average May

    49.9 °F

  • Highest 4 May, 2026

    80.6 °F

Climate (2021–Present)

Janesville-Rock County (14.3 miles)

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  • Average Low 2021–2026

    40.4 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    60.4 °F
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