Isle Royale · September
Isle Royale in September
September is a good time to visit Isle Royale — quieter than August, busier than October.
Crowd score
How busy it gets
A comfortable middle ground: some company on popular trails, but no gridlock.
About 39% of this park's busiest month.
Source: NPS Visitor Use Statistics, 2023–2025
Data: NPS visitation 2023–2025 · crowd scores computed Jul 2026 · alerts checked Jul 10, 2026. How this is calculated →
Computed from federal data · Methodology by Sharon Ben-Moshe
Visitation
Typical September visits vs. the year
Typical monthly recreation visits, averaged over the most recent three full years.
Source: NPS Visitor Use Statistics, 2023–2025
Weather
September weather
- Avg high
- 65°F
- Avg low
- 44°F
- Precipitation
- 3.1"
- Sunrise
- 5:32 AM
- Sunset
- 6:06 PM
- Daylight
- 12.6h
Source: NOAA 1991–2020 climate normals, GRAND PORTAGE, MN US
What's open
Isle Royale in September: access
Isle Royale National Park is open annually from April 16 to October 31. Transportation services are offered from May to September. The island and its surrounding islands are closed to all visitors from November 1 to April 15 due to extreme winter weather conditions and for the safety and protection of visitors. This closure extends 4.5 miles out into Lake Superior from the island. Park headquarters during the winter is in Houghton, Michigan. Summer headquarters is located at Mott Island on Isle Royale.
Seasonal closures may apply:
- Park Closure
Tent Camping Closed at Three Mile Campground
Due to increased human-wildlife interactions and food storage concerns, individual tent sites and group sites at Three Mile Campground are currently closed. Tent and hammock camping are not permitted anywhere within the campground. Off-trail camping zones 11, 12, and 33 are closed. Shelters remain open. Food, trash, and scented items must be stored in animal-resistant, hard-sided containers or food storage lockers. Backpacks must be stored in shelters. Closed areas will be patrolled to ensure compliance.
Source: NPS Data API
Conditions
Current alerts
- Information
Food Storage Regulations in Effect
Proper food storage is required on Isle Royale. All food, trash, scented items, cooking supplies, cooking utensils, and fish/fish parts must be stored properly. To learn more about food storage and to learn how to properly store your food, trash, and scented items, click "more."
Details on nps.gov → - Park Closure
Tent Camping Closed at Three Mile Campground
Due to increased human-wildlife interactions and food storage concerns, individual tent sites and group sites at Three Mile Campground are currently closed. Tent and hammock camping are not permitted anywhere within the campground. Off-trail camping zones 11, 12, and 33 are closed. Shelters remain open. Food, trash, and scented items must be stored in animal-resistant, hard-sided containers or food storage lockers. Backpacks must be stored in shelters. Closed areas will be patrolled to ensure compliance.
Source: NPS Data API
Context
Isle Royale crowds across the year
FAQ
Isle Royale in September
How busy is Isle Royale in September?
September rates 4/10 for crowds (Moderate) at Isle Royale National Park — about 39% of its busiest month. Typical recreation visits: 3,475.
What is the weather like at Isle Royale in September?
In September, Isle Royale averages a high of 65°F and a low of 44°F, with about 3.1 inches of precipitation.