Weather on September 30 at Isle Royale
Isle Royale National Park
Based on 49 years of data from Houghton, MI
Planning Your Visit
September 30th in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 62°F and lows near 42°F. Over 49 years of records, the warmest September 30th was in 1995 (69°F average), while the coldest was 1974 (38°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 41% of September 30th dates historically, with the wettest September 30th recording 2.24" of rain. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for September 30th 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 | 66°F | 56°F | 0" | -- |
| 2024 | 79°F | 46°F | 0" | -- |
| 2023 | 70°F | 58°F | 0.28" | -- |
| 2022 | 70°F | 39°F | 0" | -- |
| 2021 | 78°F | 49°F | 0" | -- |
| 2020 | 55°F | 46°F | 0.46" | -- |
| 2019 | 69°F | 54°F | 1.35" | -- |
| 2018 | 55°F | 33°F | 0" | -- |
| 2017 | 62°F | 34°F | 0" | -- |
| 2016 | 67°F | 41°F | 0" | -- |
| 2015 | 60°F | 31°F | 0" | -- |
| 2014 | 51°F | 37°F | 0" | -- |
| 2013 | 73°F | 47°F | 0" | -- |
| 2012 | 60°F | 33°F | 0" | -- |
| 2011 | 50°F | 37°F | 0" | -- |
| 2010 | 59°F | 39°F | 0" | -- |
| 2009 | 53°F | 27°F | 0" | -- |
| 2008 | 53°F | 44°F | 0.25" | -- |
| 2007 | 67°F | 57°F | 2.03" | -- |
| 2006 | 55°F | 44°F | 0.15" | -- |
| 2005 | 67°F | 46°F | 0" | -- |
| 2004 | 69°F | 35°F | 0" | -- |
| 2003 | 44°F | 32°F | 0.64" | -- |
| 2002 | 77°F | 55°F | 0.69" | 0" |
| 2001 | 74°F | 40°F | 0" | 0" |
| 2000 | 80°F | 56°F | 0" | 0" |
| 1999 | 61°F | 37°F | 0" | 0" |
| 1998 | 59°F | 40°F | 0.51" | 0" |
| 1997 | 55°F | 44°F | 0.2" | 0" |
| 1996 | 53°F | 35°F | 0.08" | 0" |
| 1995 | 78°F | 60°F | 2.24" | 0" |
| 1994 | 58°F | 44°F | 0" | 0" |
| 1993 | 53°F | 28°F | 0.1" | 0" |
| 1992 | 60°F | 35°F | 0" | 0" |
| 1991 | 54°F | 42°F | 0.89" | 0" |
| 1990 | 52°F | 40°F | 0" | 0" |
| 1989 | 76°F | 42°F | 0" | 0" |
| 1988 | 67°F | 53°F | 0" | 0" |
| 1983 | 67°F | 54°F | 0.1" | 0" |
| 1981 | 43°F | 39°F | 1.27" | 0" |
| 1980 | 56°F | 44°F | 0" | 0" |
| 1979 | 56°F | 42°F | 0" | 0" |
| 1978 | 51°F | 44°F | 0.08" | 0" |
| 1977 | 54°F | 42°F | 0.03" | 0" |
| 1976 | 73°F | 39°F | 0" | 0" |
| 1974 | 43°F | 33°F | 0.53" | 0" |
| 1973 | 65°F | 41°F | 0" | 0" |
| 1972 | 47°F | 35°F | 0" | 0" |
| 1971 | 73°F | 49°F | 0.33" | 0" |