Afton Weather Forecast

    • 60
    • 85

    Increasing Clouds

    • 61
    • 82

    Chance Thunderstorms

    • 61
    • 79

    Chance Thunderstorms

    • 61
    • 76

    Chance Thunderstorms

    • 58
    • 77

    Chance Rain Showers

    • 54
    • 75

    Slight Chance Thunderstorms

Today 18 Sep Rock

Partly sunny. Highs in the mid 80s. East Winds around 5 Mph.

Tonight 18 Sep Rock

Partly cloudy through around Midnight, then mostly cloudy with isolated light Showers after midnight. Mostly cloudy with slight chance of Thunderstorms and isolated light Showers early in the morning. Lows in the lower 60s. East Winds 5 to 10 Mph. Chance of precipitation 20 percent.

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Afton Temperature Statistics

September Temperature

Janesville-Rock County (1.9 miles)

  • Lowest 7 September, 2025

    39.2 °F

  • Average September

    59.4 °F

  • Highest 14 September, 2025

    84.2 °F

Climate (2020–Present)

Janesville-Rock County (1.9 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.3 °F
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