Isle Royale National Park in August
August at Isle Royale National Park averages a daytime high near 73°F and an overnight low around 52°F, with about 3" of precipitation. Visitation runs about 4.2× the park's average month, which makes August a very busy month here.
- Average low
- 52°F
- Average high
- 73°F
Range across the year: 1°F to 74°F
- Precipitation
- 3.0 in
- Daylight
- 14.1 hours
Roughly 35% of the park's yearly visitors come in August: roughly 7,100 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
It is the single busiest month of the year at Isle Royale; January, the quietest, runs only about 0× the average — a 84-to-1 swing between high and low season.
On our Best Time to Visit score August rates 46/100 ("Fair"). Our recommended month is September: the lightest crowds of the park's good-weather months.
The daily average of about 63°F is a comfortable range for hiking and being outdoors all day. These figures are 1991–2020 NOAA climate normals from the nearest station, about 40 miles from the park.
August falls inside the park's busiest stretch: June, July and August together pull about 83% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.
You'll have about 14.1 hours of daylight in August to explore — between the 8.2-hour midwinter low and the 15.8-hour summer high.
Park-wide, 2019 drew 26,410 recreation visits, up 2.4% from 25,798 in 2018.
Across the past decade overall visitation has risen about 56.7%, so a August visit is likely to feel busier than it did a few years ago.
How August compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| July | 74°F / 52°F | 3.6× Very busy | 55 Fair |
| August | 73°F / 52°F | 4.2× Very busy | 46 Fair |
| September | 65°F / 44°F | 1.3× Busy | 65 Good |
All twelve months at Isle Royale, with the best time to visit.
Things to do at Isle Royale in August
The National Park Service tags 41 Isle Royale activities for summer. Here are 8 of them. Each links to the park's own page for it.
- Stoll Memorial Trail (Scoville Point) · 1-6 hours
- Attend a Rock Harbor Ranger Program · 20-60 minutes
- Feldtmann Loop Section 3: Hike from Siskiwit Bay to Island Mine · 1 day
- Greenstone Section 5: Hike from Hatchet Lake to Ishpeming Tower · 1 day
- Harbor to Hills Section 3: Hike from Daisy Farm to Moskey Basin · 1 day
- Hike the Mount Ojibway Trail · 1-3 hours
- Minong Section 1: Hike from McCargoe Cove to Todd Harbor · 1 day
- Portage from Chickenbone Lake to Lake Livermore · 1 day
Frequently Asked Questions
August averages a daytime high near 73°F and an overnight low around 52°F at Isle Royale National Park, with about 3 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 40 miles from the park, so conditions inside the park can differ, especially at other elevations.
August is very busy at Isle Royale National Park (about 4.2× the average month). Our best-time score rates it "Fair" at 46/100. Our recommended month is September.
The busiest month is August and the quietest is January. August sits at about 4.2× the park's average, or 35% of annual visitation.
A typical August sees about 7,000 recreation visits at Isle Royale National Park, based on National Park Service monthly counts from 1979–2025.
Where to stay near Isle Royale in August
Booking a August trip to Isle Royale National Park? Compare hotels, cabins and vacation rentals near the park with live August availability and prices.
Top-rated places to stay near Isle Royale
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Visiting Isle Royale in August?
Get crowd forecasts and lodging deals for Isle Royale by email. No spam, unsubscribe anytime.
See the full ranking of the best national parks to visit in August.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.