Duluth Weather Forecast

    • 58
    • 68

    Dense Fog

    • 59
    • 68

    Mostly Cloudy

    • 61
    • 74

    Chance Thunderstorms

    • 63
    • 79

    Mostly Cloudy

    • 60
    • 75

    Chance Rain Showers

    • 54
    • 67

    Chance Rain Showers

Today 13 Sep Carlton/South St. Louis

Mostly cloudy this Morning, then becoming partly sunny. Areas of fog this morning. Highs in the lower 70s. East Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 13 Sep Carlton/South St. Louis

Mostly cloudy. Patchy fog after midnight. Lows in the upper 50s. East Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

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Duluth Temperature Statistics

September Temperature

Duluth - Sky Harbor Airport (5 miles)

  • Lowest 7 September, 2025

    41 °F

  • Average September

    56.8 °F

  • Highest 2 September, 2025

    75.2 °F

Climate (2020–Present)

Duluth - Sky Harbor Airport (5 miles)

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  • Average Low 2020–2025

    35.9 °F

  • Average 2020–2025

    42.7 °F

  • Average High 2020–2025

    49.7 °F
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