Duluth Harbor Basin Weather Forecast

    • 61
    • 72

    Chance Rain Showers

    • 63
    • 71

    Chance Rain Showers

    • 63
    • 71

    Chance Thunderstorms

    • 63
    • 80

    Mostly Cloudy

    • 63
    • 80

    Slight Chance Rain Showers

    • 61
    • 77

    Partly Sunny

    • 61
    • 74

    Chance Rain Showers

Today 28 Aug Carlton/South St. Louis

Mostly sunny. Near steady temperature in the mid 70s. Southwest Winds around 5 Mph.

Tonight 28 Aug Carlton/South St. Louis

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms after midnight. Not as cool with Lows in the upper 50s. East Winds around 5 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Duluth Harbor Basin Temperature Statistics

August Temperature

Duluth - Sky Harbor Airport (3.7 miles)

  • Lowest 19 August, 2026

    51.8 °F

  • Average August

    67.4 °F

  • Highest 6 August, 2026

    84.2 °F

Climate (2021–2026)

Duluth - Sky Harbor Airport (3.7 miles)

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  • Average Low 2021–2026

    35.7 °F

  • Average 2021–2026

    42.4 °F

  • Average High 2021–2026

    49.3 °F
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