Janesville Weather Forecast

    • 72
    • 88

    Increasing Clouds

    • 63
    • 89

    Rain Showers

    • 58
    • 81

    Rain Showers

    • 61
    • 81

    Mostly Sunny

    • 56
    • 81

    Chance Thunderstorms

    • 56
    • 76

    Slight Chance Rain Showers

Today 9 Jun Bremer

Patchy fog in the morning. Mostly sunny. Humid with Highs in the upper 80s. North Winds around 5 Mph, becoming southeast in the afternoon.

Tonight 9 Jun Bremer

Mostly cloudy. Patchy fog. Near steady temperature in the upper 60s. Northwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Janesville Temperature Statistics

June Temperature

Waterloo, Waterloo Municipal Airport (6.8 miles)

  • Lowest 2 June, 2026

    53.7 °F

  • Average June

    72.4 °F

  • Highest 6 June, 2026

    87.1 °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

    51.2 °F

  • Average High 2021–2026

    62 °F
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