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
  23°C max day temperature
• 8
  8 hours of sunshine per day
• 12
  12 days with some rainfall
• 10
  10°C min night temperature
• 14
  14 hours of daylight per day
• 0
  No heat & humidity
• 89
  89 mm of monthly rainfall
• 7
  7 (High) UV index
• 15
  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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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.

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