Grand Portage weather in August 2025

Expect 23°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Grand Portage in August. Check more long-term weather averages for Grand Portage in August before you book your next holiday to Minnesota in 2025/2026.

  • 23°C maximum daytime temperature in August in Grand Portage23
    23°C max day temperature
  • 8 hours of sunshine per day
  • 12 days with some rainfall in August in Grand Portage12
    12 days with some rainfall
  • 10°C minimum night-time temperature in August in Grand Portage10
    10°C min night temperature
  • 14 hours of daylight per day in August in Grand Portage14
    14 hours of daylight per day
  • No heat & humidity in August in Grand Portage0
    No heat & humidity
  • 89 mm monthly rainfall in August in Grand Portage89
    89 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in Grand Portage7
    7 (High) UV index
  • 15°C sea temperature in August in Grand Portage15
    15°C sea temperature

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The August weather guide for Minnesota (Grand Portage) 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 / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Grand Portage in August?

Daytime temperatures usually reach 23°C in Grand Portage in August, falling to 10°C at night.

How sunny is it in Grand Portage in August?

There are normally 8 hours of bright sunshine each day in Grand Portage in August - that's 58% of daylight hours.

How warm is the sea around Grand Portage in August?

The average sea temperature around Grand Portage in August is 15°C.

Does it rain in Grand Portage in August?

There are usually 12 days with some rain in Grand Portage in August and the average monthly rainfall is 89mm.

Grand Portage August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:36 19:34
Saturday, 16th August 2025 04:56 19:09
Sunday, 31st August 2025 05:16 18:41

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