Hartland Weather Forecast

    • 56
    • 69

    Rain Showers

    • 56
    • 66

    Rain Showers

    • 50
    • 64

    Chance Rain Showers

    • 51
    • 60

    Chance Rain Showers

    • 50
    • 60

    Mostly Cloudy

    • 52
    • 65

    Mostly Cloudy

Today 18 Sep Waukesha

Partly sunny. A 50 percent chance of light rain Showers in the afternoon. Highs in the upper 60s. East Winds 5 to 15 Mph.

Tonight 18 Sep Waukesha

Rain Showers through around Midnight, then rain Showers and chance of Thunderstorms after midnight. Locally heavy rainfall possible after midnight. Lows in the upper 50s. East Winds 10 to 15 Mph. Chance of precipitation near 100 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Hartland Temperature Statistics

September Temperature

Waukesha County Airport (6.2 miles)

  • Lowest 14 September, 2026

    46.4 °F

  • Average September

    68.6 °F

  • Highest 1 September, 2026

    87.8 °F

Climate (2021–2026)

Waukesha County Airport (6.2 miles)

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

  • Average Low 2021–2026

    38.8 °F

  • Average 2021–2026

    46.2 °F

  • Average High 2021–2026

    56.6 °F
Get WillyWeather+ to remove ads