Weather on May 20 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
May 20th in Isle Royale National Park (via Houghton, MI) typically brings mild spring weather, with average highs around 66°F and lows near 43°F. Over 50 years of records, the warmest May 20th was in 1992 (71°F average), while the coldest was 2007 (36°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 36% of May 20th dates historically, with the wettest May 20th recording 2.46" 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 May 20th 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 | 52°F | 35°F | 0" | -- |
| 2024 | 67°F | 52°F | 0" | -- |
| 2023 | 70°F | 39°F | 0" | -- |
| 2022 | 66°F | 45°F | 0.23" | -- |
| 2021 | 74°F | 64°F | 0.15" | -- |
| 2020 | 70°F | 45°F | 0" | -- |
| 2019 | 56°F | 40°F | 0" | -- |
| 2018 | 67°F | 30°F | 0" | -- |
| 2017 | 49°F | 35°F | 0.13" | -- |
| 2016 | 73°F | 42°F | 0" | -- |
| 2015 | 60°F | 31°F | 0" | -- |
| 2014 | 55°F | 45°F | 1.57" | -- |
| 2013 | 49°F | 44°F | 1.35" | -- |
| 2012 | 79°F | 44°F | 2.46" | -- |
| 2011 | 70°F | 48°F | 0" | -- |
| 2010 | 69°F | 49°F | 0" | -- |
| 2009 | 90°F | 35°F | 0" | -- |
| 2008 | 47°F | 38°F | 0.13" | -- |
| 2007 | 42°F | 31°F | 0.03" | -- |
| 2006 | 59°F | 37°F | 0.36" | -- |
| 2005 | 70°F | 41°F | 0" | -- |
| 2004 | 61°F | 40°F | 0" | -- |
| 2003 | 69°F | 39°F | 0.94" | 0" |
| 2002 | 49°F | 27°F | 0" | 0" |
| 2001 | 81°F | 47°F | 0" | 0" |
| 2000 | 69°F | 32°F | 0" | 0" |
| 1999 | 70°F | 41°F | 0" | 0" |
| 1998 | 80°F | 50°F | 0" | 0" |
| 1997 | 51°F | 37°F | 0.08" | 0" |
| 1996 | 65°F | 52°F | 0" | 0" |
| 1995 | 62°F | 46°F | 0" | 0" |
| 1994 | 88°F | 46°F | 0" | 0" |
| 1993 | 58°F | 42°F | 0" | 0" |
| 1992 | 85°F | 57°F | 0" | 0" |
| 1991 | 73°F | 41°F | 0" | 0" |
| 1990 | 56°F | 40°F | 0" | 0" |
| 1989 | 66°F | 47°F | 0.46" | 0" |
| 1988 | 78°F | 49°F | 0" | 0" |
| 1982 | 51°F | 35°F | 0.05" | 0" |
| 1981 | 78°F | 50°F | 0" | 0" |
| 1980 | 82°F | 47°F | 0" | 0" |
| 1979 | 46°F | 39°F | 0.66" | 0" |
| 1978 | 57°F | 35°F | 0.2" | 0" |
| 1977 | 82°F | 55°F | 0.81" | 0" |
| 1976 | 66°F | 46°F | 0" | 0" |
| 1975 | 75°F | 52°F | 0" | 0" |
| 1974 | 72°F | 43°F | 0" | 0" |
| 1973 | 59°F | 45°F | 0" | 0" |
| 1972 | 77°F | 56°F | 0.03" | 0" |
| 1971 | 48°F | 34°F | 0.2" | 0" |