Olsons Bay Weather Forecast

    • 64
    • 80

    Rain Showers

    • 46
    • 75

    Rain Showers Likely

    • 39
    • 61

    Partly Sunny

    • 44
    • 63

    Partly Sunny

    • 48
    • 69

    Partly Sunny

    • 52
    • 74

    Partly Sunny

Today 18 May Jefferson

Mostly cloudy. Showers likely and chance of Thunderstorms in the Morning, then chance of Showers and Thunderstorms in the late morning and afternoon. Highs in the lower 80s. Southwest Winds 10 to 15 Mph. Chance of precipitation 60 percent.

Tonight 18 May Jefferson

Partly cloudy in the evening then becoming mostly cloudy. Chance of Showers and Thunderstorms until early Morning, then Showers and chance of Thunderstorms early in the morning. Lows in the mid 60s. South Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation 80 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Olsons Bay Temperature Statistics

May Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 2 May, 2026

    30.2 °F

  • Average May

    49.9 °F

  • Highest 4 May, 2026

    80.6 °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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