Janesville Weather Forecast

    • 20
    • 50

    Breezy

    • 11
    • 25

    Blustery

    • 26
    • 33

    Chance Snow

    • 8
    • 33

    Chance Snow

    • 1
    • 15

    Mostly Cloudy

    • 4
    • 14

    Mostly Cloudy

Today 13 Jan Bremer

Partly sunny. Highs in the upper 40s. West Winds 15 to 20 Mph with Gusts up to 35 Mph.

Tonight 13 Jan Bremer

Mostly cloudy and Breezy, cooler with Lows around 19. Northwest Winds 20 to 25 Mph with Gusts up to 35 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Janesville Temperature Statistics

January Temperature

Waterloo, Waterloo Municipal Airport (6.8 miles)

  • Lowest 1 January, 2026

    10 °F

  • Average January

    28.2 °F

  • Highest 8 January, 2026

    43 °F

Climate (2021–Present)

Waterloo, Waterloo Municipal Airport (6.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    40.2 °F

  • Average 2021–2026

    51 °F

  • Average High 2021–2026

    61.7 °F
Get WillyWeather+ to remove ads