Weather on September 25 at Isle Royale

Isle Royale National Park

MIMidwest800 ft elevation
Avg High62°F
Avg Low45°F
Warmest200964°F
Coldest197641°F

Based on 50 years of data from Houghton, MI

Planning Your Visit

September 25th in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 62°F and lows near 45°F. Over 50 years of records, the warmest September 25th was in 2009 (64°F average), while the coldest was 1976 (41°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 50% of September 25th dates historically, with the wettest September 25th recording 3.25" of rain. The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.

The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.

Planning for September 25th in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202577°F44°F0"--
202469°F45°F0"--
202368°F58°F0"--
202256°F42°F1.8"--
202159°F45°F0.56"--
202074°F55°F3.25"--
201963°F52°F0.03"--
201862°F48°F0.18"--
201773°F54°F2.18"--
201665°F54°F0.66"--
201568°F56°F0"--
201469°F53°F0"--
201369°F40°F0"--
201254°F30°F0.03"--
201163°F44°F0"--
201051°F35°F0.18"--
200973°F55°F0"--
200865°F44°F0"--
200767°F49°F0.23"--
200657°F38°F0.58"--
200559°F50°F0.08"--
200467°F43°F0.03"--
200348°F39°F0.38"--
200258°F43°F0.69"0"
200153°F37°F0"0"
200063°F37°F0"0"
199966°F43°F0"0"
199870°F47°F0.18"0"
199774°F53°F0"0"
199663°F40°F0"0"
199559°F40°F0"0"
199468°F47°F0.56"0"
199365°F47°F0"0"
199272°F47°F0"0"
199149°F40°F1.12"0"
199063°F47°F0"0"
198956°F44°F0.05"0"
198860°F42°F0"0"
198364°F44°F0"0"
198155°F52°F0.15"0"
198048°F39°F1.17"0"
197966°F47°F0"0"
197854°F36°F0"0"
197763°F52°F0.46"0"
197650°F32°F0"0"
197556°F34°F0"0"
197451°F44°F0.05"0"
197373°F53°F0.41"0"
197261°F42°F0.56"0"
197165°F40°F0"0"

September 25 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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