Olsons Bay Weather Forecast

    • 55
    • 78

    Increasing Clouds

    • 62
    • 80

    Partly Sunny

    • 62
    • 82

    Mostly Sunny

    • 59
    • 81

    Mostly Sunny

    • 60
    • 80

    Partly Sunny

    • 65
    • 79

    Chance Rain Showers

Today 24 Aug Jefferson

Sunny. Patchy fog in the morning. Highs in the upper 70s. Northwest Winds up to 5 Mph.

Tonight 24 Aug Jefferson

Clear after midnight then becoming partly cloudy. Patchy fog through the night. Lows in the upper 40s. Calm Winds.

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Olsons Bay Temperature Statistics

August Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 3 August, 2026

    53.6 °F

  • Average August

    68.9 °F

  • Highest 4 August, 2026

    84.2 °F

Climate (2021–2026)

Janesville-Rock County (17.4 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.3 °F
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