Weather on September 16 at Isle Royale

Isle Royale National Park

MIMidwest800 ft elevation
Avg High67°F
Avg Low48°F
Warmest202476°F
Coldest201145°F

Based on 48 years of data from Houghton, MI

Planning Your Visit

September 16th in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 67°F and lows near 48°F. Over 48 years of records, the warmest September 16th was in 2024 (76°F average), while the coldest was 2011 (45°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 33% of September 16th dates historically, with the wettest September 16th recording 3.99" of rain. The last decade has been 8.4°F warmer on this date compared to 20-30 years ago.

The last decade has been 8.4°F warmer on this date compared to 20-30 years ago.

Planning for September 16th in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202585°F64°F0"--
202486°F66°F0.33"--
202365°F52°F0"--
202265°F57°F2.92"--
202178°F57°F0.76"--
202063°F38°F0"--
201975°F50°F0"--
201884°F61°F0"--
201780°F59°F0"--
201671°F59°F2.82"--
201584°F65°F0.03"--
201462°F45°F0"--
201360°F32°F0"--
201271°F45°F0"--
201160°F30°F0"--
201057°F45°F0.08"--
200964°F49°F0"--
200873°F48°F0"--
200765°F38°F0"--
200674°F55°F1.3"--
200578°F49°F0"--
200459°F45°F0"--
200372°F50°F0"--
200276°F46°F0"0"
200169°F46°F0"0"
200071°F35°F0"0"
199965°F44°F0"0"
199879°F44°F0"0"
199765°F52°F0"0"
199660°F45°F0"0"
199571°F55°F2.72"0"
199477°F58°F3.99"0"
199361°F39°F0"0"
199167°F53°F0.1"0"
199054°F39°F0"0"
198973°F47°F0"0"
198859°F53°F0.23"0"
198354°F49°F1.09"0"
198153°F42°F0.56"0"
198061°F42°F0.03"0"
197976°F47°F0"0"
197855°F38°F0"0"
197754°F50°F0.15"0"
197668°F36°F0"0"
197555°F45°F0"0"
197466°F41°F0"0"
197352°F41°F0"0"
197158°F43°F0.23"0"

September 16 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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