Darien Weather Forecast

    • 60
    • 83

    Mostly Sunny

    • 59
    • 83

    Partly Sunny

    • 59
    • 77

    Mostly Cloudy

    • 60
    • 78

    Chance Thunderstorms

    • 61
    • 78

    Chance Rain Showers

    • 58
    • 78

    Chance Rain Showers

Today 17 Sep Walworth

Sunny. Highs in the mid 80s. Southeast Winds up to 5 Mph.

Tonight 17 Sep Walworth

Clear. Patchy fog. Lows in the mid 50s. Calm Winds.

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  • Temperature Real-Time

Darien Temperature Statistics

September Temperature

Janesville-Rock County (16.8 miles)

  • Lowest 7 September, 2025

    39.2 °F

  • Average September

    58.5 °F

  • Highest 14 September, 2025

    84.2 °F

Climate (2020–Present)

Janesville-Rock County (16.8 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.2 °F
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