Weather on October 20 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
October 20th in Isle Royale National Park (via Houghton, MI) typically brings cool fall weather, with average highs around 52°F and lows near 37°F. Over 50 years of records, the warmest October 20th was in 2000 (67°F average), while the coldest was 2002 (32°F) — a 35°F range across recorded history. Precipitation has occurred on 48% of recorded October 20th dates, with snow falling 8% of the time (heaviest snowfall: 3.2"). The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in Isle Royale? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 59°F | 35°F | 0.25" | -- |
| 2024 | 71°F | 52°F | 0" | -- |
| 2023 | 49°F | 30°F | 0" | -- |
| 2022 | 47°F | 30°F | 0" | -- |
| 2021 | 52°F | 43°F | 0" | -- |
| 2020 | 39°F | 32°F | 0.46" | -- |
| 2019 | 59°F | 39°F | 0" | -- |
| 2018 | 42°F | 30°F | 0.15" | -- |
| 2017 | 81°F | 49°F | 0" | -- |
| 2016 | 46°F | 35°F | 0.03" | -- |
| 2015 | 51°F | 40°F | 0" | -- |
| 2014 | 47°F | 40°F | 0" | -- |
| 2013 | 46°F | 31°F | 0.15" | -- |
| 2012 | 57°F | 34°F | 0" | -- |
| 2011 | 45°F | 37°F | 0" | -- |
| 2010 | 53°F | 38°F | 0.13" | -- |
| 2009 | 44°F | 39°F | 0.08" | -- |
| 2008 | 49°F | 36°F | 0.15" | -- |
| 2007 | 63°F | 49°F | 0.13" | -- |
| 2006 | 41°F | 32°F | 0" | -- |
| 2005 | 46°F | 27°F | 0.03" | -- |
| 2004 | 52°F | 39°F | 0" | -- |
| 2003 | 62°F | 43°F | 0.05" | -- |
| 2002 | 36°F | 29°F | 0.03" | 0.5" |
| 2001 | 58°F | 41°F | 0.13" | 0" |
| 2000 | 76°F | 58°F | 0" | 0" |
| 1999 | 45°F | 35°F | 0.2" | 0" |
| 1998 | 48°F | 40°F | 0.36" | 0" |
| 1997 | 45°F | 33°F | 0" | 0" |
| 1996 | 53°F | 29°F | 0" | 0" |
| 1995 | 50°F | 40°F | 0" | 0" |
| 1994 | 55°F | 49°F | 0.05" | 0" |
| 1993 | 58°F | 38°F | 0.61" | 0" |
| 1992 | 39°F | 30°F | 0.84" | 3.2" |
| 1991 | 41°F | 29°F | 0.05" | 0.2" |
| 1990 | 49°F | 35°F | 0.61" | 0" |
| 1989 | 41°F | 35°F | 0" | 0" |
| 1988 | 52°F | 32°F | 0" | 0" |
| 1983 | 46°F | 32°F | 0" | 0" |
| 1981 | 48°F | 28°F | 0.84" | 0" |
| 1980 | 42°F | 34°F | 0.05" | 0" |
| 1979 | 68°F | 49°F | 0.05" | 0" |
| 1978 | 72°F | 36°F | 0" | 0" |
| 1977 | 68°F | 35°F | 0" | 0" |
| 1976 | 41°F | 30°F | 0.15" | 0.6" |
| 1975 | 61°F | 40°F | 0" | 0" |
| 1974 | 38°F | 29°F | 0" | 0" |
| 1973 | 55°F | 42°F | 0" | 0" |
| 1972 | 52°F | 26°F | 0" | 0" |
| 1971 | 58°F | 39°F | 0" | 0" |