Weather on September 19 at Isle Royale

Isle Royale National Park

MIMidwest800 ft elevation
Avg High66°F
Avg Low49°F
Warmest200073°F
Coldest199139°F

Based on 50 years of data from Houghton, MI

Planning Your Visit

September 19th in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 66°F and lows near 49°F. Over 50 years of records, the warmest September 19th was in 2000 (73°F average), while the coldest was 1991 (39°F) — a 34°F range across recorded history. Precipitation has occurred on 58% of recorded September 19th dates, with snow falling 2% of the time. Temperatures on this date have remained relatively stable over the past several decades.

Temperatures on this date have remained relatively stable over the past several decades.

Planning for September 19th in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202562°F54°F0.03"--
202479°F59°F0.03"--
202367°F46°F0"--
202275°F59°F0.18"--
202187°F57°F0"--
202063°F43°F0"--
201977°F62°F0"--
201857°F41°F0.03"--
201768°F56°F0"--
201672°F62°F0.23"--
201563°F50°F0"--
201465°F46°F0.3"--
201378°F61°F0.15"--
201258°F36°F0.33"--
201163°F51°F0.08"--
201055°F35°F0"--
200975°F41°F0"--
200879°F57°F0"--
200766°F51°F0.84"--
200648°F43°F1.42"--
200561°F53°F1.07"--
200478°F52°F0"--
200362°F49°F0.91"--
200271°F59°F1.73"0"
200163°F55°F0"0"
200087°F59°F0.1"0"
199975°F53°F1.14"0"
199879°F57°F1.17"0"
199767°F55°F4.7"0"
199671°F40°F0"0"
199567°F45°F0.38"0"
199477°F48°F0"0"
199356°F33°F0"0"
199256°F42°F0"0"
199143°F35°F0.43"0.2"
199061°F49°F0.05"0"
198977°F59°F0.03"0"
198867°F60°F0.38"0"
198356°F46°F0.81"0"
198159°F44°F0"0"
198059°F38°F1.19"0"
197960°F36°F0"0"
197875°F52°F0"0"
197755°F41°F0.41"0"
197668°F45°F3.51"0"
197564°F44°F0"0"
197458°F43°F0"0"
197353°F39°F0.05"0"
197264°F46°F0"0"
197155°F38°F0.05"0"

September 19 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

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