Weather on September 22 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
September 22nd in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 60°F and lows near 44°F. Over 50 years of records, the warmest September 22nd was in 2023 (67°F average), while the coldest was 1974 (36°F) — a 31°F range across recorded history. Precipitation has occurred on 50% of recorded September 22nd dates, with snow falling 2% of the time. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for September 22nd 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 | 64°F | 56°F | 4.09" | -- |
| 2024 | 69°F | 45°F | 0" | -- |
| 2023 | 80°F | 54°F | 0" | -- |
| 2022 | 53°F | 35°F | 0.28" | -- |
| 2021 | 63°F | 38°F | 0" | -- |
| 2020 | 72°F | 48°F | 0" | -- |
| 2019 | 74°F | 56°F | 0" | -- |
| 2018 | 60°F | 40°F | 0" | -- |
| 2017 | 73°F | 59°F | 1.17" | -- |
| 2016 | 62°F | 51°F | 0" | -- |
| 2015 | 67°F | 42°F | 0" | -- |
| 2014 | 65°F | 33°F | 0" | -- |
| 2013 | 53°F | 34°F | 0" | -- |
| 2012 | 49°F | 37°F | 0.74" | -- |
| 2011 | 50°F | 43°F | 0.08" | -- |
| 2010 | 60°F | 38°F | 0" | -- |
| 2009 | 69°F | 50°F | 0" | -- |
| 2008 | 72°F | 51°F | 0" | -- |
| 2007 | 67°F | 47°F | 0" | -- |
| 2006 | 56°F | 50°F | 0.71" | -- |
| 2005 | 66°F | 48°F | 0.15" | -- |
| 2004 | 65°F | 56°F | 0" | -- |
| 2003 | 57°F | 51°F | 1.09" | -- |
| 2002 | 63°F | 47°F | 0.15" | 0" |
| 2001 | 68°F | 54°F | 0" | 0" |
| 2000 | 56°F | 37°F | 0.05" | 0" |
| 1999 | 68°F | 43°F | 0" | 0" |
| 1998 | 58°F | 39°F | 0.61" | 0" |
| 1997 | 65°F | 51°F | 0" | 0" |
| 1996 | 65°F | 54°F | 0" | 0" |
| 1995 | 47°F | 32°F | 0.74" | 1" |
| 1994 | 70°F | 55°F | 0.53" | 0" |
| 1993 | 61°F | 47°F | 0.3" | 0" |
| 1992 | 49°F | 33°F | 0.05" | 0" |
| 1991 | 60°F | 48°F | 0" | 0" |
| 1990 | 50°F | 39°F | 0.81" | 0" |
| 1989 | 62°F | 39°F | 0.2" | 0" |
| 1988 | 58°F | 51°F | 0.1" | 0" |
| 1983 | 47°F | 39°F | 0.43" | 0" |
| 1981 | 54°F | 37°F | 0" | 0" |
| 1980 | 57°F | 43°F | 0.08" | 0" |
| 1979 | 62°F | 39°F | 0" | 0" |
| 1978 | 66°F | 43°F | 0" | 0" |
| 1977 | 54°F | 47°F | 0.33" | 0" |
| 1976 | 52°F | 31°F | 0.05" | 0" |
| 1975 | 51°F | 37°F | 0.36" | 0" |
| 1974 | 41°F | 31°F | 0" | 0" |
| 1973 | 52°F | 43°F | 0.97" | 0" |
| 1972 | 54°F | 34°F | 0" | 0" |
| 1971 | 54°F | 34°F | 0.53" | 0" |