Isle Royale National Park Climate and Average Weather
Climate of Isle Royale National Park: average temperatures, rainfall and seasons month by month.
Climate in Isle Royale National Park month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 22° | 13° | 1,7 in | ★★☆☆☆ |
| February | 27° | 16° | 1,9 in | ★★☆☆☆ |
| March | 33° | 23° | 2,2 in | ★★☆☆☆ |
| April | 41° | 31° | 4,0 in | ★★☆☆☆ |
| May | 52° | 39° | 2,4 in | ★★★☆☆ |
| June | 60° | 47° | 3,7 in | ★★★★☆ |
| July | 68° | 57° | 2,4 in | ★★★★☆ |
| August | 68° | 60° | 2,1 in | ★★★★☆ |
| September | 64° | 57° | 1,9 in | ★★★★☆ |
| October | 53° | 47° | 3,5 in | ★★★☆☆ |
| November | 40° | 34° | 2,1 in | ★★★☆☆ |
| December | 31° | 22° | 2,4 in | ★★☆☆☆ |
Climate type: Subarctic. Source: Open-Meteo archive (ERA5).
Recent extremes in Isle Royale National Park
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Isle Royale National Park compares with nearby places
Annual averages, and the difference against Isle Royale National Park.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Lake Superior | 53 mi | 38°F | 36°F cooler | 31 in |
| Porcupine Mountains Wilderness State Park | 99 mi | 44°F | +35°F warmer | 35 in |
| Tettegouche State Park | 131 mi | 43°F | +33°F warmer | 32 in |
| Voyageurs National Park | 200 mi | 42°F | about the same | 27 in |
| Ontario | 267 mi | 36°F | 38°F cooler | 26 in |
Best time to visit Isle Royale National Park
Go in July, August and September. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
What this means for Isle Royale National Park
Today is cooler than average for August. The forecast high of 57°F is 11.5°F below the 68°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 79°F.
What to pack, what to skip
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
Summary
Isle Royale National Park is a national park in Michigan. Isle Royale National Park is a US national park known for remote island wilderness and wolves.
Right now it is 56°F (13°C) in Isle Royale National Park with clear sky. It feels like 51°F. Today runs from 53°F to 57°F. Chance of precipitation is 0%. Sightseeing conditions score 9.2/10 - excellent - go now.
The best time to visit Isle Royale National Park is July, August and September. The climate is subarctic. January, February and December tend to be the least comfortable months. August is the warmest month with average highs near 68°F, while January is the coldest with lows near 13°F.
Nearby highlights include Lake Superior, Porcupine Mountains Wilderness State Park, Tettegouche State Park and Voyageurs National Park.
In plain terms. Today is cooler than average for August. The forecast high of 57°F is 11.5°F below the 68°F typical for this month. The best window to be outside is roughly 11 AM to 2 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in Isle Royale National Park today at 9.9/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Isle Royale National Park
| Type | National park |
|---|---|
| State | Michigan |
| Country | United States |
| Continent | North America |
| Coordinates | 48°0′22.7″N 88°33′14.4″W (48.0063, -88.554) |
| Established | 1940 |
| Known for | remote island wilderness and wolves |
| Local time | 9:28 AM (UTC-04:00) |
| Best months | July, August and September |
| Climate | Subarctic |
Weather map for Isle Royale National Park
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore Isle Royale National Park
Every topic we hold for this place, and the same topic for the places around it.
Climate for related places
Frequently asked questions
Where is Isle Royale National Park?
Isle Royale National Park is a national park in Michigan. Its coordinates are 48.0063, -88.554. It lies in North America.
What is the weather like in Isle Royale National Park right now?
It is currently 56°F (13°C) with clear sky. Humidity is 68% and wind is 10 mph.
When is the best time to visit Isle Royale National Park?
July, August and September offer the most comfortable conditions in Isle Royale National Park, which has a subarctic climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Isle Royale National Park in?
Isle Royale National Park observes America/Detroit (UTC-04:00). The local time is 9:28 AM.
What are the top things to do in Isle Royale National Park?
Popular options include Lake Superior, Porcupine Mountains Wilderness State Park, Tettegouche State Park and Voyageurs National Park.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (national-parks) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 24, 2026 at 9:28 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
