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 | 69° | 61° | 2,2 in | ★★★★☆ |
| September | 65° | 57° | 1,4 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 | 45°F | +35°F warmer | 36 in |
| Ontario | 267 mi | 36°F | 38°F cooler | 27 in |
| Lake Michigan | 287 mi | 45°F | +35°F warmer | 33 in |
| Minnesota | 302 mi | 48°F | +38°F warmer | 37 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 slightly cooler than average for October. The forecast high of 47°F is 6.8°F below the 53°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 warm mid-layer and gloves for early mornings and evenings
- A packable rain shell - 3 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 39°F (4°C) in Isle Royale National Park with overcast. It feels like 31°F. Today runs from 37°F to 47°F. Chance of precipitation is 0%. Sightseeing conditions score 7.6/10 - good conditions.
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 69°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 slightly cooler than average for October. The forecast high of 47°F is 6.8°F below the 53°F typical for this month. The best window to be outside is roughly 9 AM to 12 PM, when temperature, rain chance and wind line up best. running is the strongest bet in Isle Royale National Park today at 9.4/10. 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 | 1:10 PM (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 39°F (4°C) with overcast. Humidity is 64% and wind is 8 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 1:10 PM.
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 October 28, 2026 at 1:10 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
