Robert O Cook Memorial Arboretum Weather Forecast

    • 59
    • 79

    Mostly Cloudy

    • 65
    • 85

    Chance Thunderstorms

    • 66
    • 86

    Rain Showers

    • 61
    • 78

    Rain Showers

    • 59
    • 78

    Slight Chance Thunderstorms

    • 67
    • 82

    Chance Thunderstorms

    • 72
    • 88

    Mostly Sunny

Today 15 Jun Rock

Mostly cloudy. East Winds around 5 Mph.

Tonight 15 Jun Rock

Mostly cloudy. Isolated light rain Showers until early morning. Lows in the upper 50s. East Winds up to 10 Mph. Chance of Showers 20 percent.

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Robert O Cook Memorial Arboretum Temperature Statistics

June Temperature

Janesville-Rock County (6.2 miles)

  • Lowest 1 June, 2025

    42.8 °F

  • Average June

    63.1 °F

  • Highest 11 June, 2025

    89.6 °F

Climate (2020–Present)

Janesville-Rock County (6.2 miles)

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  • Average Low 2020–2025

    40.5 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    60.3 °F
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