Duluth International Airport Weather Forecast

    • 59
    • 76

    Chance Rain Showers

    • 61
    • 74

    Rain Showers

    • 60
    • 81

    Chance Rain Showers

    • 51
    • 70

    Partly Sunny

    • 53
    • 73

    Partly Sunny

    • 54
    • 76

    Slight Chance Thunderstorms

Today 6 Sep Carlton/South St. Louis

Mostly cloudy this Morning, then becoming partly sunny. Warmer with Highs in the lower 80s. Southeast Winds 5 to 10 Mph.

Tonight 6 Sep Carlton/South St. Louis

Mostly cloudy. A slight chance of Showers and Thunderstorms after midnight. Humid with Lows around 60. East Winds around 5 Mph. Chance of rain 20 percent.

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Duluth International Airport Temperature Statistics

September Temperature

Duluth International Airport (0 miles)

  • Lowest 2 September, 2026

    56.6 °F

  • Average September

    67.2 °F

  • Highest 1 September, 2026

    81.6 °F

Climate (2021–2026)

Duluth International Airport (0 miles)

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  • Average Low 2021–2026

    33.2 °F

  • Average 2021–2026

    42.2 °F

  • Average High 2021–2026

    51 °F
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