Weather on September 4 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
September 4th in Isle Royale National Park (via Houghton, MI) typically brings pleasant fall weather, with average highs around 71°F and lows near 52°F. Over 50 years of records, the warmest September 4th was in 1999 (78°F average), while the coldest was 2025 (50°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 4th dates historically, with the wettest September 4th recording 9.09" of rain. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for September 4th 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 | 55°F | 44°F | 0.28" | -- |
| 2024 | 80°F | 57°F | 0" | -- |
| 2023 | 90°F | 64°F | 0" | -- |
| 2022 | 66°F | 39°F | 0" | -- |
| 2021 | 68°F | 58°F | 0.3" | -- |
| 2020 | 63°F | 50°F | 0" | -- |
| 2019 | 62°F | 44°F | 0" | -- |
| 2018 | 73°F | 59°F | 0.69" | -- |
| 2017 | 63°F | 50°F | 0.03" | -- |
| 2016 | 80°F | 57°F | 0" | -- |
| 2015 | 79°F | 56°F | 0" | -- |
| 2014 | 71°F | 56°F | 0.2" | -- |
| 2013 | 68°F | 44°F | 0" | -- |
| 2012 | 81°F | 53°F | 0.33" | -- |
| 2011 | 62°F | 50°F | 0.23" | -- |
| 2010 | 55°F | 47°F | 0" | -- |
| 2009 | 76°F | 50°F | 0" | -- |
| 2008 | 60°F | 45°F | 0" | -- |
| 2007 | 61°F | 54°F | 9.09" | -- |
| 2006 | 76°F | 51°F | 0" | -- |
| 2005 | 72°F | 50°F | 0" | -- |
| 2004 | 82°F | 56°F | 0" | -- |
| 2003 | 62°F | 43°F | 0" | -- |
| 2002 | 68°F | 55°F | 0" | 0" |
| 2001 | 74°F | 48°F | 0" | 0" |
| 2000 | 67°F | 44°F | 0" | 0" |
| 1999 | 90°F | 66°F | 0" | 0" |
| 1998 | 80°F | 48°F | 0" | 0" |
| 1997 | 71°F | 38°F | 0" | 0" |
| 1996 | 81°F | 59°F | 0.08" | 0" |
| 1995 | 81°F | 61°F | 0.03" | 0" |
| 1994 | 66°F | 46°F | 0" | 0" |
| 1993 | 62°F | 51°F | 0.2" | 0" |
| 1992 | 74°F | 48°F | 0" | 0" |
| 1991 | 67°F | 53°F | 0" | 0" |
| 1990 | 75°F | 61°F | 0.28" | 0" |
| 1989 | 66°F | 58°F | 0.79" | 0" |
| 1988 | 61°F | 51°F | 0.1" | 0" |
| 1983 | 76°F | 60°F | 1.57" | 0" |
| 1981 | 59°F | 49°F | 0" | 0" |
| 1980 | 71°F | 62°F | 0" | 0" |
| 1979 | 78°F | 47°F | 0" | 0" |
| 1978 | 79°F | 52°F | 0" | 0" |
| 1977 | 62°F | 55°F | 3.48" | 0" |
| 1976 | 61°F | 45°F | 0" | 0" |
| 1975 | 68°F | 50°F | 0" | 0" |
| 1974 | 64°F | 46°F | 0" | 0" |
| 1973 | 80°F | 65°F | 0.15" | 0" |
| 1972 | 70°F | 45°F | 0.05" | 0" |
| 1971 | 82°F | 70°F | 0" | 0" |