Porcupine Mountains State Park Weather Forecast

    • 53
    • 62

    Chance Rain Showers

    • 56
    • 66

    Chance Rain Showers

    • 57
    • 68

    Rain Showers Likely

    • 57
    • 69

    Chance Thunderstorms

    • 56
    • 70

    Chance Rain Showers

    • 54
    • 67

    Slight Chance Rain Showers

Today 18 Sep Ontonagon

Mostly cloudy with a 20 percent chance of Showers. Cooler with Highs in the mid 60s. East Winds 5 to 10 Mph.

Tonight 18 Sep Ontonagon

Cloudy with a slight chance of Showers and Thunderstorms. Lows around 52. East Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Real-Time

Porcupine Mountains State Park Temperature Statistics

September Temperature

Ironwood, Gogebic-Iron County Airport (26.1 miles)

  • Lowest 8 September, 2025

    37 °F

  • Average September

    58.2 °F

  • Highest 16 September, 2025

    84 °F

Climate (2020–Present)

Ironwood, Gogebic-Iron County Airport (26.1 miles)

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  • Average Low 2020–2025

    32.8 °F

  • Average 2020–2025

    42.5 °F

  • Average High 2020–2025

    51.3 °F
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