Friess Lake Weather Forecast

    • 31
    • 47

    Becoming Sunny

    • 28
    • 47

    Partly Sunny

    • 40
    • 52

    Partly Sunny

    • 41
    • 69

    Mostly Sunny

    • 47
    • 64

    Partly Sunny

    • 56
    • 73

    Chance Rain Showers

Today 18 Apr Washington

Much cooler. Mostly cloudy in the morning then becoming mostly sunny. Highs in the upper 40s. West Winds 15 to 20 Mph.

Tonight 18 Apr Washington

Mostly cloudy. A 50 percent chance of light rain Showers after midnight. Lows in the upper 30s. West Winds 15 to 20 Mph.

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Friess Lake Temperature Statistics

April Temperature

Waukesha County Airport (13.7 miles)

  • Lowest 7 April, 2026

    23 °F

  • Average April

    45 °F

  • Highest 12 April, 2026

    73.4 °F

Climate (2021–Present)

Waukesha County Airport (13.7 miles)

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  • Average Low 2021–2026

    38.5 °F

  • Average 2021–2026

    46 °F

  • Average High 2021–2026

    56.5 °F
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