Duluth weather in August 2025

Expect 75°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Duluth in August. Check more long-term weather averages for Duluth in August before you book your next holiday to Minnesota in 2025/2026.

  • 75°F maximum daytime temperature in August in Duluth75
    75°F max day temperature
  • 9 hours of sunshine per day
  • 11 days with some rainfall in August in Duluth11
    11 days with some rainfall
  • 54°F minimum night-time temperature in August in Duluth54
    54°F min night temperature
  • 14 hours of daylight per day in August in Duluth14
    14 hours of daylight per day
  • No heat & humidity in August in Duluth0
    No heat & humidity
  • 3.9 inches monthly rainfall in August in Duluth3.9
    3.9 inches of monthly rainfall
  • UV (maximum) index 7 (High) in August in Duluth7
    7 (High) UV index
  • 61°F sea temperature in August in Duluth61
    61°F sea temperature

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The August weather guide for Minnesota (Duluth) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Duluth in August?

Daytime temperatures usually reach 75°F in Duluth in August, falling to 54°F at night.

How sunny is it in Duluth in August?

There are normally 9 hours of bright sunshine each day in Duluth in August - that's 61% of daylight hours.

How warm is the sea around Duluth in August?

The average sea temperature around Duluth in August is 61°F.

Does it rain in Duluth in August?

There are usually 11 days with some rain in Duluth in August and the average monthly rainfall is 3.9 inches.

Duluth August sunrise & sunset times

Browse the sunrise and sunset times for Duluth in August 2025. Select a month to view Duluth sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:49 19:40
Saturday, 16th August 2025 05:08 19:16
Sunday, 31st August 2025 05:27 18:49

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