Olsons Bay Weather Forecast

    • 45
    • 73

    Mostly Sunny

    • 56
    • 75

    Mostly Sunny

    • 60
    • 79

    Rain Showers Likely

    • 48
    • 71

    Chance Rain Showers

Today 21 Apr Jefferson

Warmer. Sunny early in the afternoon. Highs in the mid 70s. West Winds 5 to 10 Mph.

Tonight 21 Apr Jefferson

Mostly clear. Lows in the lower 40s. West Winds up to 5 Mph shifting to the northeast after midnight.

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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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