Genesee Oak Opening and Fen State Natural Area Weather Forecast

    • 62
    • 82

    Increasing Clouds

    • 61
    • 76

    Chance Rain Showers

    • 61
    • 77

    Chance Rain Showers

    • 62
    • 80

    Chance Thunderstorms

    • 60
    • 79

    Chance Rain Showers

    • 56
    • 75

    Slight Chance Thunderstorms

Today 18 Sep Waukesha

Mostly sunny. A 20 percent chance of light rain Showers in the afternoon. Highs in the lower 80s. Southwest Winds up to 5 Mph shifting to the east in the afternoon.

Tonight 18 Sep Waukesha

Partly cloudy until early morning then becoming mostly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Genesee Oak Opening and Fen State Natural Area Temperature Statistics

September Temperature

Waukesha County Airport (8.7 miles)

  • Lowest 8 September, 2025

    41 °F

  • Average September

    58.9 °F

  • Highest 12 September, 2025

    80.6 °F

Climate (2020–Present)

Waukesha County Airport (8.7 miles)

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  • Average Low 2020–2025

    38.2 °F

  • Average 2020–2025

    45.7 °F

  • Average High 2020–2025

    56.2 °F
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