Olsons Bay Weather Forecast

    • 47
    • 66

    Rain Showers

    • 44
    • 61

    Mostly Cloudy

    • 39
    • 57

    Partly Sunny

    • 36
    • 56

    Slight Chance Rain Showers

    • 34
    • 53

    Partly Sunny

    • 40
    • 58

    Partly Sunny

    • 45
    • 65

    Partly Sunny

Today 27 Apr Jefferson

Cloudy with scattered Showers and chance of Thunderstorms. South Winds around 15 Mph with Gusts to around 35 Mph. Chance of precipitation 50 percent.

Tonight 27 Apr Jefferson

Cloudy. Numerous rain Showers and chance of Thunderstorms in the Evening, then scattered rain Showers late in the evening. Lows in the upper 40s. Southwest Winds 10 to 15 Mph. Chance of precipitation 60 percent.

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  • Temperature Forecast NOAA

  • 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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