Duluth International Airport Weather Forecast

    • 41
    • 58

    Mostly Cloudy

    • 39
    • 57

    Partly Sunny

    • 39
    • 58

    Sunny

    • 41
    • 61

    Mostly Sunny

    • 46
    • 62

    Mostly Cloudy

    • 48
    • 68

    Partly Sunny

Today 20 Sep Carlton/South St. Louis

Partly sunny. Highs around 60. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 20 Sep Carlton/South St. Louis

Mostly cloudy. Cooler with Lows in the upper 30s. East Winds 5 to 10 Mph.

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Duluth International Airport Temperature Statistics

September Temperature

Duluth International Airport (0 miles)

  • Lowest 14 September, 2026

    39.7 °F

  • Average September

    62.2 °F

  • Highest 1 September, 2026

    81.6 °F

Climate (2021–2026)

Duluth International Airport (0 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    42.2 °F

  • Average High 2021–2026

    51 °F
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