Weather on September 7 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
September 7th in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 69°F and lows near 51°F. Over 50 years of records, the warmest September 7th was in 2001 (76°F average), while the coldest was 1979 (48°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 42% of September 7th dates historically, with the wettest September 7th recording 3.2" of rain. The last decade has been 9.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 9.5°F cooler on this date compared to 20-30 years ago.
Planning for September 7th in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 58°F | 42°F | 0.05" | -- |
| 2024 | 57°F | 43°F | 0" | -- |
| 2023 | 52°F | 49°F | 0.03" | -- |
| 2022 | 81°F | 49°F | 0" | -- |
| 2021 | 71°F | 57°F | 0.64" | -- |
| 2020 | 60°F | 45°F | 0" | -- |
| 2019 | 60°F | 50°F | 0" | -- |
| 2018 | 70°F | 43°F | 0" | -- |
| 2017 | 55°F | 43°F | 0.38" | -- |
| 2016 | 67°F | 61°F | 0.86" | -- |
| 2015 | 76°F | 60°F | 0.61" | -- |
| 2014 | 73°F | 52°F | 0" | -- |
| 2013 | 74°F | 50°F | 0" | -- |
| 2012 | 64°F | 54°F | 0.15" | -- |
| 2011 | 73°F | 41°F | 0" | -- |
| 2010 | 61°F | 48°F | 1.7" | -- |
| 2009 | 77°F | 58°F | 0" | -- |
| 2008 | 66°F | 43°F | 0.05" | -- |
| 2007 | 72°F | 48°F | 0.3" | -- |
| 2006 | 81°F | 54°F | 0.15" | -- |
| 2005 | 71°F | 48°F | 0" | -- |
| 2004 | 62°F | 50°F | 0" | -- |
| 2003 | 66°F | 52°F | 0" | -- |
| 2002 | 91°F | 59°F | 0" | 0" |
| 2001 | 85°F | 67°F | 0.94" | 0" |
| 2000 | 75°F | 60°F | 0.13" | 0" |
| 1999 | 78°F | 48°F | 0" | 0" |
| 1998 | 74°F | 51°F | 0" | 0" |
| 1997 | 64°F | 55°F | 0" | 0" |
| 1996 | 83°F | 60°F | 0" | 0" |
| 1995 | 73°F | 43°F | 1.02" | 0" |
| 1994 | 73°F | 52°F | 0.08" | 0" |
| 1993 | 60°F | 45°F | 0" | 0" |
| 1992 | 58°F | 45°F | 0.3" | 0" |
| 1991 | 75°F | 53°F | 0" | 0" |
| 1990 | 59°F | 45°F | 0" | 0" |
| 1989 | 80°F | 61°F | 0.15" | 0" |
| 1988 | 75°F | 43°F | 0" | 0" |
| 1983 | 69°F | 51°F | 0" | 0" |
| 1981 | 65°F | 53°F | 1.65" | 0" |
| 1980 | 75°F | 51°F | 0" | 0" |
| 1979 | 54°F | 43°F | 0.13" | 0" |
| 1978 | 60°F | 56°F | 0.15" | 0" |
| 1977 | 62°F | 49°F | 0" | 0" |
| 1976 | 89°F | 58°F | 0" | 0" |
| 1975 | 59°F | 44°F | 3.2" | 0" |
| 1974 | 66°F | 50°F | 0" | 0" |
| 1973 | 61°F | 47°F | 0" | 0" |
| 1972 | 66°F | 50°F | 0" | 0" |
| 1971 | 79°F | 56°F | 0" | 0" |