Duluth International Airport Weather Forecast

    • 64
    • 79

    Chance Thunderstorms

    • 55
    • 79

    Chance Rain Showers

    • 51
    • 68

    Mostly Cloudy

    • 46
    • 61

    Partly Sunny

    • 43
    • 66

    Partly Sunny

    • 49
    • 68

    Partly Sunny

Today 21 Aug Carlton/South St. Louis

Areas of fog in the morning. Mostly sunny. Humid with Highs around 80. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 21 Aug Carlton/South St. Louis

Partly cloudy. Patchy fog. Near steady temperature in the upper 50s. Southeast Winds around 5 Mph.

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Duluth International Airport Temperature Statistics

August Temperature

Duluth International Airport (0 miles)

  • Lowest 1 August, 2025

    49.6 °F

  • Average August

    67.8 °F

  • Highest 7 August, 2025

    86.6 °F

Climate (2020–Present)

Duluth International Airport (0 miles)

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  • Average Low 2020–2025

    33.5 °F

  • Average 2020–2025

    42.3 °F

  • Average High 2020–2025

    51 °F
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