Weather on September 27 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
September 27th in Isle Royale National Park (via Houghton, MI) typically brings mild fall weather, with average highs around 61°F and lows near 45°F. Over 50 years of records, the warmest September 27th was in 2015 (69°F average), while the coldest was 1991 (36°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 50% of September 27th dates historically, with the wettest September 27th recording 2.11" of rain. 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 27th 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 | 67°F | 48°F | 0" | -- |
| 2024 | 79°F | 51°F | 0" | -- |
| 2023 | 66°F | 57°F | 0" | -- |
| 2022 | 47°F | 34°F | 0.36" | -- |
| 2021 | 65°F | 40°F | 0" | -- |
| 2020 | 67°F | 55°F | 0.41" | -- |
| 2019 | 60°F | 46°F | 0.33" | -- |
| 2018 | 58°F | 45°F | 0.36" | -- |
| 2017 | 57°F | 45°F | 0.05" | -- |
| 2016 | 54°F | 49°F | 2.11" | -- |
| 2015 | 81°F | 57°F | 0" | -- |
| 2014 | 81°F | 49°F | 0" | -- |
| 2013 | 76°F | 52°F | 0" | -- |
| 2012 | 60°F | 30°F | 0" | -- |
| 2011 | 60°F | 57°F | 1.17" | -- |
| 2010 | 66°F | 37°F | 0" | -- |
| 2009 | 66°F | 53°F | 0.46" | -- |
| 2008 | 65°F | 46°F | 0.89" | -- |
| 2007 | 56°F | 44°F | 0.05" | -- |
| 2006 | 53°F | 42°F | 0.05" | -- |
| 2005 | 72°F | 53°F | 0" | -- |
| 2004 | 65°F | 48°F | 1.02" | -- |
| 2003 | 49°F | 43°F | 2.08" | -- |
| 2002 | 58°F | 32°F | 0.03" | 0" |
| 2001 | 60°F | 42°F | 0" | 0" |
| 2000 | 64°F | 34°F | 0.08" | 0" |
| 1999 | 67°F | 51°F | 0.51" | 0" |
| 1998 | 64°F | 57°F | 0.2" | 0" |
| 1997 | 69°F | 53°F | 0.41" | 0" |
| 1996 | 58°F | 50°F | 1.75" | 0" |
| 1995 | 68°F | 39°F | 0" | 0" |
| 1994 | 51°F | 44°F | 0.38" | 0" |
| 1993 | 48°F | 40°F | 0.2" | 0" |
| 1992 | 56°F | 47°F | 0.97" | 0" |
| 1991 | 41°F | 30°F | 0" | 0" |
| 1990 | 62°F | 50°F | 0" | 0" |
| 1989 | 67°F | 33°F | 0" | 0" |
| 1988 | 56°F | 42°F | 0" | 0" |
| 1983 | 59°F | 50°F | 0" | 0" |
| 1981 | 53°F | 41°F | 0" | 0" |
| 1980 | 51°F | 39°F | 0" | 0" |
| 1979 | 81°F | 55°F | 0" | 0" |
| 1978 | 52°F | 39°F | 0" | 0" |
| 1977 | 56°F | 50°F | 0.58" | 0" |
| 1976 | 45°F | 32°F | 0" | 0" |
| 1975 | 65°F | 38°F | 0" | 0" |
| 1974 | 64°F | 48°F | 0" | 0" |
| 1973 | 60°F | 49°F | 0.08" | 0" |
| 1972 | 46°F | 33°F | 0" | 0" |
| 1971 | 63°F | 52°F | 0.1" | 0" |