Friess Lake Weather Forecast

    • 59
    • 73

    Rain Showers

    • 62
    • 69

    Rain Showers

    • 49
    • 67

    Rain Showers

    • 43
    • 63

    Mostly Sunny

    • 45
    • 63

    Partly Sunny

    • 40
    • 63

    Mostly Sunny

    • 42
    • 60

    Mostly Sunny

Today 29 Sep Washington

Sunny. Highs in the lower 60s.

Tonight 29 Sep Washington

Warmer. Slight chance of light rain Showers in the Evening, then light rain Showers in the late evening and overnight. Slight chance of Thunderstorms after midnight. Lows in the upper 50s. South Winds up to 10 Mph. Chance of precipitation 90 percent.

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Friess Lake Temperature Statistics

September Temperature

Waukesha County Airport (13.7 miles)

  • Lowest 26 September, 2026

    44.6 °F

  • Average September

    64 °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

    56.6 °F
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