Weather on May 31 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
May 31st in Isle Royale National Park (via Houghton, MI) typically brings mild spring weather, with average highs around 67°F and lows near 45°F. Over 50 years of records, the warmest May 31st was in 1988 (76°F average), while the coldest was 2009 (40°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 50% of May 31st dates historically, with the wettest May 31st recording 3.66" 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 31st in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 76°F | 38°F | 0" | -- |
| 2025 | 62°F | 34°F | 0" | -- |
| 2024 | 76°F | 45°F | 0.3" | -- |
| 2023 | 91°F | 57°F | 0" | -- |
| 2021 | 68°F | 45°F | 0" | -- |
| 2020 | 69°F | 44°F | 0" | -- |
| 2019 | 67°F | 39°F | 0" | -- |
| 2018 | 75°F | 45°F | 0" | -- |
| 2017 | 57°F | 39°F | 0.56" | -- |
| 2016 | 50°F | 43°F | 0.18" | -- |
| 2015 | 50°F | 34°F | 0" | -- |
| 2014 | 84°F | 51°F | 0" | -- |
| 2013 | 82°F | 53°F | 0.61" | -- |
| 2012 | 61°F | 35°F | 0" | -- |
| 2011 | 82°F | 51°F | 0" | -- |
| 2010 | 70°F | 51°F | 0.03" | -- |
| 2009 | 52°F | 28°F | 0.3" | -- |
| 2008 | 54°F | 43°F | 0.05" | -- |
| 2007 | 76°F | 56°F | 0.23" | -- |
| 2006 | 72°F | 54°F | 0" | -- |
| 2005 | 71°F | 43°F | 0" | -- |
| 2004 | 49°F | 41°F | 3.66" | -- |
| 2003 | 53°F | 35°F | 1.3" | 0" |
| 2002 | 80°F | 54°F | 0.15" | 0" |
| 2001 | 68°F | 37°F | 0" | 0" |
| 2000 | 72°F | 48°F | 0.05" | 0" |
| 1999 | 86°F | 40°F | 0.43" | 0" |
| 1998 | 51°F | 43°F | 0.15" | 0" |
| 1997 | 81°F | 46°F | 0" | 0" |
| 1996 | 79°F | 41°F | 0" | 0" |
| 1995 | 83°F | 65°F | 0" | 0" |
| 1994 | 68°F | 49°F | 0.58" | 0" |
| 1993 | 50°F | 39°F | 0.03" | 0" |
| 1992 | 68°F | 48°F | 0" | 0" |
| 1991 | 72°F | 53°F | 0" | 0" |
| 1990 | 76°F | 54°F | 0" | 0" |
| 1989 | 66°F | 45°F | 0.08" | 0" |
| 1988 | 89°F | 62°F | 0" | 0" |
| 1982 | 48°F | 40°F | 0.71" | 0" |
| 1981 | 65°F | 38°F | 0" | 0" |
| 1980 | 63°F | 43°F | 1.19" | 0" |
| 1979 | 56°F | 47°F | 1.22" | 0" |
| 1978 | 50°F | 41°F | 0.08" | 0" |
| 1977 | 64°F | 50°F | 0.13" | 0" |
| 1976 | 72°F | 51°F | 0" | 0" |
| 1975 | 61°F | 39°F | 0" | 0" |
| 1974 | 63°F | 44°F | 0.33" | 0" |
| 1973 | 66°F | 51°F | 0.1" | 0" |
| 1972 | 65°F | 35°F | 0.03" | 0" |
| 1971 | 48°F | 36°F | 0" | 0" |