Weather on August 31 at Isle Royale

Isle Royale National Park

MIMidwest800 ft elevation
Avg High73°F
Avg Low53°F
Warmest200076°F
Coldest201751°F

Based on 50 years of data from Houghton, MI

Planning Your Visit

August 31st in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 73°F and lows near 53°F. Over 50 years of records, the warmest August 31st was in 2000 (76°F average), while the coldest was 2017 (51°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 38% of August 31st dates historically, with the wettest August 31st recording 4.8" of rain. The last decade has been 4.5°F cooler on this date compared to 20-30 years ago.

The last decade has been 4.5°F cooler on this date compared to 20-30 years ago.

Planning for August 31st in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202579°F54°F0"--
202482°F58°F0.74"--
202376°F48°F0"--
202271°F56°F0"--
202172°F47°F0"--
202063°F54°F1.3"--
201972°F49°F0"--
201876°F57°F3.61"--
201761°F42°F0"--
201669°F52°F0.13"--
201586°F61°F0"--
201468°F50°F0"--
201377°F57°F0.05"--
201278°F51°F0"--
201164°F60°F0.2"--
201083°F70°F0"--
200967°F44°F0"--
200891°F54°F0"--
200768°F49°F0"--
200670°F40°F0"--
200574°F55°F0"--
200463°F47°F0.08"--
200369°F57°F0"0"
200281°F57°F0"0"
200177°F52°F0.23"0"
200086°F66°F0.1"0"
199978°F56°F0.05"0"
199878°F49°F0"0"
199782°F56°F0"0"
199684°F55°F0"0"
199578°F59°F4.8"0"
199459°F49°F0.36"0"
199363°F49°F0"0"
199264°F47°F0"0"
199161°F45°F0"0"
199074°F60°F0.08"0"
198964°F53°F0.64"0"
198872°F52°F0"0"
198375°F61°F0"0"
198176°F62°F0"0"
198070°F49°F0.03"0"
197966°F53°F2.01"0"
197868°F44°F0"0"
197778°F59°F1.57"0"
197664°F51°F0"0"
197570°F53°F0"0"
197458°F46°F0"0"
197382°F62°F0"0"
197274°F61°F0.28"0"
197166°F44°F0.03"0"

August 31 at Nearby Parks

Holiday Weather at Isle Royale

Official NPS WebsiteVisit nps.gov/isro for park information, alerts, and reservations

Explore More at Isle Royale

See historical weather for other dates

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