Best time to visit Isle Royale

Find the best time to visit Isle Royale and plan your perfect trip in 2025/2026. Get holiday inspiration, weather guides, travel advice and find great deals.

Isle Royale by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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When is the best time to visit Isle Royale?

The best time to visit Isle Royale is July based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

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Max Day Temperature (°C)

  • -8°C maximum daytime temperature in January in Isle Royale-8
    Jan
  • -6°C maximum daytime temperature in February in Isle Royale-6
    Feb
  • 0°C maximum daytime temperature in March in Isle Royale0
    Mar
  • 8°C maximum daytime temperature in April in Isle Royale8
    Apr
  • 15°C maximum daytime temperature in May in Isle Royale15
    May
  • 20°C maximum daytime temperature in June in Isle Royale20
    Jun
  • 24°C maximum daytime temperature in July in Isle Royale24
    Jul
  • 22°C maximum daytime temperature in August in Isle Royale22
    Aug
  • 17°C maximum daytime temperature in September in Isle Royale17
    Sep
  • 11°C maximum daytime temperature in October in Isle Royale11
    Oct
  • 2°C maximum daytime temperature in November in Isle Royale2
    Nov
  • -5°C maximum daytime temperature in December in Isle Royale-5
    Dec

Hours of Sunshine (daily)

Which is the hottest month in Isle Royale?

The hottest time of year in Isle Royale is normally July. Expect maximum daytime temperatures to reach 24°C.

Which month has the most rain in Isle Royale?

In terms of rainfall, September is usually the wettest month in Isle Royale with 86mm on average. There are normally 13 days in September with some rain.

When is it sunniest in Isle Royale?

The sunniest time of year in Isle Royale is normally July with bright sunshine on average for 62% of daylight hours; that's 10 hours of sunshine per day.

When is the sea warmest in Isle Royale?

The sea is usually at its warmest in Isle Royale in August when the water temperature reaches 13°C.

Best time to visit

The weather guide for Michigan (Isle Royale) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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