Darien Weather Forecast

    • 50
    • 60

    Rain Showers

    • 48
    • 64

    Mostly Cloudy

    • 48
    • 64

    Mostly Cloudy

    • 46
    • 66

    Mostly Cloudy

    • 48
    • 65

    Mostly Cloudy

    • 52
    • 68

    Mostly Cloudy

Today 22 Sep Walworth

Mostly cloudy. Numerous light rain Showers in the Morning, then scattered light rain Showers late in the morning. Scattered Sprinkles in the afternoon. Highs in the lower 60s. Northeast Winds 10 to 15 Mph. Chance of Showers 70 percent.

Tonight 22 Sep Walworth

Partly cloudy. Lows around 50. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

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Darien Temperature Statistics

September Temperature

Janesville-Rock County (16.8 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    66.8 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (16.8 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.2 °F
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