Duluth Harbor Basin Weather Forecast

    • 53
    • 80

    Mostly Sunny

    • 42
    • 67

    Mostly Sunny

    • 42
    • 49

    Rain Showers

    • 41
    • 56

    Rain Showers

    • 37
    • 50

    Slight Chance Rain Showers

    • 39
    • 51

    Partly Sunny

    • 42
    • 55

    Slight Chance Rain Showers

Today 15 May Carlton/South St. Louis

Sunny. Patchy blowing dust. Hot. Near steady temperature around 80. West Winds around 20 Mph with Gusts up to 40 Mph.

Tonight 15 May Carlton/South St. Louis

Mostly clear. Lows in the upper 40s. West Winds 15 to 20 Mph with Gusts up to 35 Mph, Diminishing to 5 to 10 Mph with Gusts up to 20 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Duluth Harbor Basin Temperature Statistics

May Temperature

Duluth - Sky Harbor Airport (3.7 miles)

  • Lowest 1 May, 2026

    30.2 °F

  • Average May

    46.1 °F

  • Highest 2 May, 2026

    64.4 °F

Climate (2021–Present)

Duluth - Sky Harbor Airport (3.7 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    35.9 °F

  • Average 2021–2026

    42.7 °F

  • Average High 2021–2026

    49.7 °F
Get WillyWeather+ to remove ads