Friess Lake Weather Forecast

    • 55
    • 75

    Rain Showers

    • 59
    • 68

    Mostly Cloudy

    • 57
    • 74

    Chance Rain Showers

    • 60
    • 70

    Rain Showers Likely

    • 58
    • 75

    Rain Showers Likely

    • 53
    • 68

    Chance Rain Showers

Today 15 Sep Washington

Cloudy. Showers and slight chance of Thunderstorms in the Morning, then light Showers likely late in the morning. Highs in the mid 70s. Southwest Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation 90 percent.

Tonight 15 Sep Washington

Mostly cloudy then becoming partly cloudy in the late evening and early morning then becoming mostly cloudy. Lows in the mid 50s. Northwest Winds up to 10 Mph shifting to the north after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Friess Lake Temperature Statistics

September Temperature

Waukesha County Airport (13.7 miles)

  • Lowest 6 September, 2026

    59 °F

  • Average September

    70.5 °F

  • Highest 1 September, 2026

    87.8 °F

Climate (2021–2026)

Waukesha County Airport (13.7 miles)

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  • Average Low 2021–2026

    38.8 °F

  • Average 2021–2026

    46.2 °F

  • Average High 2021–2026

    56.7 °F
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