Sun Valley Weather Forecast

    • 21
    • 40

    Breezy

    • 30
    • 43

    Partly Sunny

    • 22
    • 38

    Mostly Sunny

    • 30
    • 48

    Partly Sunny

    • 23
    • 38

    Slight Chance Rain/Snow

    • 26
    • 33

    Chance Snow

    • 18
    • 41

    Slight Chance Rain/Snow

Today 27 Jan Waukesha

Mostly cloudy. West Winds 15 to 20 Mph with Gusts to around 35 Mph.

Tonight 27 Jan Waukesha

Mostly cloudy in the evening then clearing. Lows in the lower 20s. Northwest Winds 5 to 15 Mph. Gusts up to 30 Mph through around midnight.

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Sun Valley Temperature Statistics

January Temperature

Waukesha County Airport (9.3 miles)

  • Lowest 21 January, 2025

    -13 °F

  • Average January

    14.6 °F

  • Highest 17 January, 2025

    51.8 °F

Climate (2020–Present)

Waukesha County Airport (9.3 miles)

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  • Average Low 2020–2025

    38 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    55.9 °F
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