Hartland Weather Forecast

    • 69
    • 86

    Chance Rain Showers

    • 63
    • 81

    Partly Sunny

    • 60
    • 79

    Partly Sunny

    • 63
    • 79

    Mostly Cloudy

    • 69
    • 82

    Chance Rain Showers

    • 64
    • 85

    Slight Chance Rain Showers

Today 4 Sep Waukesha

Warm and humid. Partly sunny. Patchy fog in the morning. Chance of light Showers in the morning. Slight chance of light Showers and Thunderstorms late in the afternoon. Highs in the upper 80s. Southeast Winds 5 to 10 Mph shifting to the southwest in the afternoon. Chance of precipitation 40 percent. Highest heat index Readings 95 to 97 in the afternoon.

Tonight 4 Sep Waukesha

Partly cloudy until early morning then becoming mostly cloudy. A 50 percent chance of light Showers and Thunderstorms. Lows in the upper 60s. Northeast Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Hartland Temperature Statistics

September Temperature

Waukesha County Airport (6.2 miles)

  • Lowest 1 September, 2026

    73.4 °F

  • Average September

    77.8 °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

    38.7 °F

  • Average 2021–2026

    46.2 °F

  • Average High 2021–2026

    56.6 °F
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