Olsons Bay Weather Forecast

    • 33
    • 53

    Decreasing Clouds

    • 32
    • 51

    Partly Sunny

    • 40
    • 55

    Partly Sunny

    • 45
    • 64

    Chance Rain Showers

    • 45
    • 72

    Chance Rain Showers

    • 41
    • 62

    Chance Rain Showers

    • 39
    • 57

    Chance Rain Showers

Today 30 Apr Jefferson

Mostly cloudy. Scattered light rain Showers early in the Afternoon, then numerous light rain Showers late in the afternoon. Near steady temperature in the lower 50s. Northwest Winds around 5 Mph. Chance of Showers 60 percent.

Tonight 30 Apr Jefferson

Mostly cloudy with scattered light rain Showers through around Midnight, then partly cloudy after midnight. Widespread frost after midnight. Lows in the lower 30s. North Winds up to 5 Mph. Chance of Showers 50 percent.

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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

    48.7 °F

  • Average High 2021–2026

    60.4 °F
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