Olsons Bay Weather Forecast

    • 43
    • 65

    Mostly Sunny

    • 44
    • 66

    Mostly Sunny

    • 49
    • 68

    Mostly Sunny

    • 50
    • 70

    Mostly Sunny

    • 51
    • 68

    Partly Sunny

    • 53
    • 68

    Mostly Cloudy

Today 19 Oct Jefferson

Sunny in the morning then becoming partly sunny. Highs in the mid 60s. Southwest Winds up to 5 Mph.

Tonight 19 Oct Jefferson

Partly cloudy through around midnight then clearing. Lows in the lower 40s. Calm Winds.

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Olsons Bay Temperature Statistics

October Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 16 October, 2026

    37.4 °F

  • Average October

    57.3 °F

  • Highest 12 October, 2026

    86 °F

Climate (2021–2026)

Janesville-Rock County (17.4 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.6 °F

  • Average High 2021–2026

    60.1 °F
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