Olsons Bay Weather Forecast

    • 32
    • 61

    Becoming Sunny

    • 41
    • 61

    Chance Rain Showers

    • 48
    • 74

    Rain Showers

    • 41
    • 62

    Partly Sunny

    • 51
    • 69

    Chance Rain Showers

    • 54
    • 74

    Chance Thunderstorms

    • 54
    • 76

    Chance Rain Showers

Today 10 May Jefferson

Partly sunny. Northwest Winds 10 to 15 Mph.

Tonight 10 May Jefferson

Mostly cloudy then becoming partly cloudy late in the evening then becoming clear. Widespread frost after midnight. Lows in the lower 30s. Northeast Winds around 5 Mph.

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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

    47.3 °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

    48.7 °F

  • Average High 2021–2026

    60.4 °F
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