Olsons Bay Weather Forecast

    • 60
    • 80

    Increasing Clouds

    • 69
    • 82

    Rain Showers

    • 58
    • 82

    Chance Rain Showers

    • 54
    • 76

    Mostly Sunny

    • 60
    • 78

    Partly Sunny

    • 61
    • 80

    Chance Rain Showers

Today 7 Sep Jefferson

Mostly sunny. Highs around 80. Southeast Winds up to 10 Mph.

Tonight 7 Sep Jefferson

Partly cloudy. Near steady temperature in the mid 50s. East Winds up to 5 Mph.

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  • Temperature Real-Time

Olsons Bay Temperature Statistics

September Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 1 September, 2026

    69.8 °F

  • Average September

    77.2 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (17.4 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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