Janesville Weather Forecast

    • 52
    • 80

    Chance Thunderstorms

    • 49
    • 71

    Mostly Sunny

    • 53
    • 75

    Partly Sunny

    • 54
    • 76

    Chance Thunderstorms

    • 56
    • 78

    Rain Showers Likely

    • 55
    • 77

    Mostly Sunny

Today 13 Jun Bremer

Mostly Sunny, then becoming mostly sunny this Morning, then becoming partly sunny. A chance of Showers this morning. A chance of Showers and Thunderstorms this afternoon. Highs in the upper 70s. Southwest Winds 5 to 10 Mph, becoming northwest 10 to 15 Mph this afternoon. Chance of rain 40 percent.

Tonight 13 Jun Bremer

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the lower 50s. Northwest Winds 10 to 15 Mph. Chance of rain 40 percent.

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  • Temperature Real-Time

Janesville Temperature Statistics

June Temperature

Waterloo, Waterloo Municipal Airport (6.8 miles)

  • Lowest 2 June, 2026

    53.7 °F

  • Average June

    74 °F

  • Highest 6 June, 2026

    87.7 °F

Climate (2021–Present)

Waterloo, Waterloo Municipal Airport (6.8 miles)

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  • Average Low 2021–2026

    40.2 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    62 °F
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