Olsons Bay Weather Forecast

    • 33
    • 69

    Rain Showers

    • 34
    • 41

    Rain/Snow

    • 40
    • 59

    Rain

    • 42
    • 61

    Rain Likely

    • 34
    • 57

    Rain Likely

    • 28
    • 46

    Partly Sunny

Today 31 Mar Jefferson

Cooler. Partly sunny in the morning then becoming cloudy. Light rain Showers and chance of Thunderstorms. Highs in the upper 60s. Southwest Winds 10 to 15 Mph with Gusts to around 30 Mph shifting to the north in the afternoon. Chance of precipitation 90 percent.

Tonight 31 Mar Jefferson

Much Colder. Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower 30s. Northeast Winds 5 to 15 Mph.

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Olsons Bay Temperature Statistics

March Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 1 March, 2026

    10.4 °F

  • Average March

    39 °F

  • Highest 21 March, 2026

    77 °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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