Ontonagon Weather Forecast

    • 51
    • 66

    Decreasing Clouds

    • 53
    • 67

    Mostly Cloudy

    • 49
    • 64

    Mostly Cloudy

    • 46
    • 61

    Partly Sunny

    • 48
    • 63

    Mostly Sunny

    • 53
    • 66

    Partly Sunny

Today 18 Sep Ontonagon

A slight chance of Showers in the afternoon. Cloudy. Highs around 67. Southeast Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 18 Sep Ontonagon

A 20 percent chance of Showers. Partly cloudy in the Evening, then becoming mostly cloudy. Lows 46 to 51. Light southeast Winds.

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Ontonagon Temperature Statistics

September Temperature

Houghton County Memorial Airport (44.1 miles)

  • Lowest 14 September, 2026

    37 °F

  • Average September

    63.3 °F

  • Highest 1 September, 2026

    82 °F

Climate (2021–2026)

Houghton County Memorial Airport (44.1 miles)

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  • Average Low 2021–2026

    35.8 °F

  • Average 2021–2026

    44 °F

  • Average High 2021–2026

    51.9 °F
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