Weather on September 22 at Isle Royale

Isle Royale National Park

MIMidwest800 ft elevation
Avg High60°F
Avg Low44°F
Warmest202367°F
Coldest197436°F

Based on 50 years of data from Houghton, MI

Planning Your Visit

September 22nd in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 60°F and lows near 44°F. Over 50 years of records, the warmest September 22nd was in 2023 (67°F average), while the coldest was 1974 (36°F) — a 31°F range across recorded history. Precipitation has occurred on 50% of recorded September 22nd dates, with snow falling 2% of the time. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.

The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.

Planning for September 22nd in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202564°F56°F4.09"--
202469°F45°F0"--
202380°F54°F0"--
202253°F35°F0.28"--
202163°F38°F0"--
202072°F48°F0"--
201974°F56°F0"--
201860°F40°F0"--
201773°F59°F1.17"--
201662°F51°F0"--
201567°F42°F0"--
201465°F33°F0"--
201353°F34°F0"--
201249°F37°F0.74"--
201150°F43°F0.08"--
201060°F38°F0"--
200969°F50°F0"--
200872°F51°F0"--
200767°F47°F0"--
200656°F50°F0.71"--
200566°F48°F0.15"--
200465°F56°F0"--
200357°F51°F1.09"--
200263°F47°F0.15"0"
200168°F54°F0"0"
200056°F37°F0.05"0"
199968°F43°F0"0"
199858°F39°F0.61"0"
199765°F51°F0"0"
199665°F54°F0"0"
199547°F32°F0.74"1"
199470°F55°F0.53"0"
199361°F47°F0.3"0"
199249°F33°F0.05"0"
199160°F48°F0"0"
199050°F39°F0.81"0"
198962°F39°F0.2"0"
198858°F51°F0.1"0"
198347°F39°F0.43"0"
198154°F37°F0"0"
198057°F43°F0.08"0"
197962°F39°F0"0"
197866°F43°F0"0"
197754°F47°F0.33"0"
197652°F31°F0.05"0"
197551°F37°F0.36"0"
197441°F31°F0"0"
197352°F43°F0.97"0"
197254°F34°F0"0"
197154°F34°F0.53"0"

September 22 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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