Olsons Bay Weather Forecast

    • 44
    • 67

    Rain Showers Likely

    • 43
    • 67

    Partly Sunny

    • 50
    • 67

    Rain Showers Likely

    • 50
    • 69

    Rain Showers

    • 42
    • 61

    Slight Chance Rain Showers

    • 40
    • 61

    Mostly Cloudy

Today 24 Apr Jefferson

Cooler. Partly sunny. Near steady temperature in the mid 60s. Northwest Winds 10 to 15 Mph.

Tonight 24 Apr Jefferson

Colder. Clear until early morning then becoming partly cloudy. Lows in the mid 40s. North Winds up to 10 Mph.

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  • Temperature Real-Time

Olsons Bay Temperature Statistics

April Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 7 April, 2026

    23 °F

  • Average April

    47.9 °F

  • Highest 17 April, 2026

    78.8 °F

Climate (2021–Present)

Janesville-Rock County (17.4 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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