Duluth International Airport Weather Forecast

    • 40
    • 62

    Becoming Sunny

    • 50
    • 62

    Rain Showers

    • 44
    • 63

    Partly Sunny

    • 48
    • 62

    Mostly Cloudy

    • 47
    • 65

    Partly Sunny

    • 48
    • 66

    Partly Sunny

Today 13 Sep Carlton/South St. Louis

Sunny. Highs in the lower 60s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 13 Sep Carlton/South St. Louis

Mostly clear. Lows in the upper 30s. Northwest Winds around 5 Mph, becoming east after midnight.

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Duluth International Airport Temperature Statistics

September Temperature

Duluth International Airport (0 miles)

  • Lowest 10 September, 2026

    47.6 °F

  • Average September

    66.7 °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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