Waukesha Weather Forecast

    • 65
    • 72

    Rain Showers

    • 64
    • 80

    Rain Showers Likely

    • 46
    • 78

    Chance Thunderstorms

    • 39
    • 61

    Partly Sunny

    • 44
    • 60

    Partly Sunny

    • 48
    • 67

    Mostly Cloudy

    • 52
    • 73

    Mostly Cloudy

Today 17 May Waukesha

Cooler. Mostly cloudy. Light rain Showers likely and slight chance of Thunderstorms early in the Afternoon, then chance of light rain Showers and Thunderstorms late in the afternoon. Highs in the lower 70s. Southeast Winds 10 to 15 Mph. Chance of precipitation 70 percent.

Tonight 17 May Waukesha

Warmer. Partly cloudy. Light Showers likely and slight chance of Thunderstorms early in the morning. Lows in the mid 60s. South Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of precipitation 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Waukesha Temperature Statistics

May Temperature

Waukesha County Airport (1.9 miles)

  • Lowest 2 May, 2026

    30.2 °F

  • Average May

    49 °F

  • Highest 4 May, 2026

    78.8 °F

Climate (2021–Present)

Waukesha County Airport (1.9 miles)

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  • Average Low 2021–2026

    38.5 °F

  • Average 2021–2026

    46 °F

  • Average High 2021–2026

    56.6 °F
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