Weather on July 31 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
July 31st in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 78°F and lows near 57°F. Over 50 years of records, the warmest July 31st was in 1999 (81°F average), while the coldest was 1973 (57°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 34% of July 31st dates historically, with the wettest July 31st recording 3.53" 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 July 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 |
|---|---|---|---|---|
| 2025 | 73°F | 50°F | 0" | -- |
| 2024 | 87°F | 61°F | 0" | -- |
| 2023 | 73°F | 55°F | 0" | -- |
| 2022 | 86°F | 59°F | 0.08" | -- |
| 2021 | 75°F | 56°F | 0.18" | -- |
| 2020 | 80°F | 56°F | 0" | -- |
| 2019 | 75°F | 50°F | 0" | -- |
| 2018 | 84°F | 55°F | 0" | -- |
| 2017 | 87°F | 63°F | 0" | -- |
| 2016 | 79°F | 54°F | 0" | -- |
| 2015 | 73°F | 57°F | 0" | -- |
| 2014 | 73°F | 55°F | 0" | -- |
| 2013 | 73°F | 56°F | 0" | -- |
| 2012 | 75°F | 58°F | 0" | -- |
| 2011 | 81°F | 62°F | 0" | -- |
| 2010 | 74°F | 60°F | 0" | -- |
| 2009 | 74°F | 50°F | 0" | -- |
| 2008 | 73°F | 55°F | 0" | -- |
| 2007 | 90°F | 69°F | 0" | -- |
| 2006 | 96°F | 66°F | 0" | -- |
| 2005 | 82°F | 61°F | 0.03" | -- |
| 2004 | 69°F | 53°F | 0.23" | -- |
| 2003 | 72°F | 55°F | 0.89" | -- |
| 2002 | 86°F | 63°F | 2.36" | 0" |
| 2001 | 78°F | 62°F | 0" | 0" |
| 2000 | 87°F | 56°F | 0" | 0" |
| 1999 | 96°F | 66°F | 0.81" | 0" |
| 1998 | 78°F | 55°F | 0" | 0" |
| 1997 | 81°F | 62°F | 0" | 0" |
| 1996 | 65°F | 51°F | 0.46" | 0" |
| 1995 | 98°F | 60°F | 0.2" | 0" |
| 1994 | 84°F | 61°F | 0.84" | 0" |
| 1993 | 81°F | 55°F | 0.08" | 0" |
| 1992 | 76°F | 52°F | 0" | 0" |
| 1991 | 74°F | 62°F | 0" | 0" |
| 1990 | 73°F | 54°F | 0" | 0" |
| 1989 | 74°F | 60°F | 0.2" | 0" |
| 1988 | 80°F | 56°F | 0.08" | 0" |
| 1983 | 73°F | 61°F | 2.36" | 0" |
| 1981 | 86°F | 62°F | 0.36" | 0" |
| 1980 | 79°F | 62°F | 0" | 0" |
| 1979 | 66°F | 53°F | 0.15" | 0" |
| 1978 | 68°F | 51°F | 0" | 0" |
| 1977 | 69°F | 56°F | 0" | 0" |
| 1976 | 69°F | 50°F | 0" | 0" |
| 1975 | 92°F | 69°F | 0" | 0" |
| 1974 | 69°F | 54°F | 0" | 0" |
| 1973 | 64°F | 50°F | 3.53" | 0" |
| 1972 | 77°F | 59°F | 0" | 0" |
| 1971 | 73°F | 42°F | 0" | 0" |