Grand Portage weather in May 2025

Expect 18°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Grand Portage in May. Check more long-term weather averages for Grand Portage in May before you book your next holiday to Minnesota in 2025/2026.

  • 18°C maximum daytime temperature in May in Grand Portage18
    18°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in May in Grand Portage11
    11 days with some rainfall
  • 2°C minimum night-time temperature in May in Grand Portage2
    2°C min night temperature
  • 15 hours of daylight per day in May in Grand Portage15
    15 hours of daylight per day
  • No heat & humidity in May in Grand Portage0
    No heat & humidity
  • 73 mm monthly rainfall in May in Grand Portage73
    73 mm of monthly rainfall
  • UV (maximum) index 6 (High) in May in Grand Portage6
    6 (High) UV index
  • 3°C sea temperature in May in Grand Portage3
    3°C sea temperature

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Recommended for Minnesota

  • Kids stay & eat for free at Marriot Bonvoy
  • Destinations include Europe, Middle East & Africa
  • Valid for up to 2 adults & 2 kids aged up to 12

The May 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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How hot is it in Grand Portage in May?

Daytime temperatures usually reach 18°C in Grand Portage in May, falling to 2°C at night.

How sunny is it in Grand Portage in May?

There are normally 8 hours of bright sunshine each day in Grand Portage in May - that's 55% of daylight hours.

Is the sea cold around Grand Portage in May?

The average sea temperature around Grand Portage in May is 3°C.

Does it rain in Grand Portage in May?

There are usually 11 days with some rain in Grand Portage in May and the average monthly rainfall is 73mm.

Grand Portage May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:40 19:12
Friday, 16th May 2025 04:18 19:33
Saturday, 31st May 2025 04:04 19:50

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