Hartland Weather Forecast

    • 50
    • 66

    Mostly Cloudy

    • 49
    • 67

    Mostly Cloudy

    • 50
    • 68

    Mostly Cloudy

    • 53
    • 70

    Partly Sunny

    • 60
    • 69

    Rain Showers Likely

    • 58
    • 67

    Chance Rain Showers

Today 25 Sep Waukesha

Mostly cloudy until late afternoon then clearing. Highs in the upper 60s. East Winds up to 10 Mph.

Tonight 25 Sep Waukesha

Partly cloudy. Lows in the upper 40s. East Winds up to 5 Mph through around midnight becoming calm.

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  • 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

    66.1 °F

  • Highest 1 September, 2026

    87.8 °F

Climate (2021–2026)

Waukesha County Airport (6.2 miles)

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  • Average Low 2021–2026

    38.8 °F

  • Average 2021–2026

    46.2 °F

  • Average High 2021–2026

    56.6 °F
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