Weather on August 31 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
August 31st in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 73°F and lows near 53°F. Over 50 years of records, the warmest August 31st was in 2000 (76°F average), while the coldest was 2017 (51°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 38% of August 31st dates historically, with the wettest August 31st recording 4.8" of rain. The last decade has been 4.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.5°F cooler on this date compared to 20-30 years ago.
Planning for August 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 | 79°F | 54°F | 0" | -- |
| 2024 | 82°F | 58°F | 0.74" | -- |
| 2023 | 76°F | 48°F | 0" | -- |
| 2022 | 71°F | 56°F | 0" | -- |
| 2021 | 72°F | 47°F | 0" | -- |
| 2020 | 63°F | 54°F | 1.3" | -- |
| 2019 | 72°F | 49°F | 0" | -- |
| 2018 | 76°F | 57°F | 3.61" | -- |
| 2017 | 61°F | 42°F | 0" | -- |
| 2016 | 69°F | 52°F | 0.13" | -- |
| 2015 | 86°F | 61°F | 0" | -- |
| 2014 | 68°F | 50°F | 0" | -- |
| 2013 | 77°F | 57°F | 0.05" | -- |
| 2012 | 78°F | 51°F | 0" | -- |
| 2011 | 64°F | 60°F | 0.2" | -- |
| 2010 | 83°F | 70°F | 0" | -- |
| 2009 | 67°F | 44°F | 0" | -- |
| 2008 | 91°F | 54°F | 0" | -- |
| 2007 | 68°F | 49°F | 0" | -- |
| 2006 | 70°F | 40°F | 0" | -- |
| 2005 | 74°F | 55°F | 0" | -- |
| 2004 | 63°F | 47°F | 0.08" | -- |
| 2003 | 69°F | 57°F | 0" | 0" |
| 2002 | 81°F | 57°F | 0" | 0" |
| 2001 | 77°F | 52°F | 0.23" | 0" |
| 2000 | 86°F | 66°F | 0.1" | 0" |
| 1999 | 78°F | 56°F | 0.05" | 0" |
| 1998 | 78°F | 49°F | 0" | 0" |
| 1997 | 82°F | 56°F | 0" | 0" |
| 1996 | 84°F | 55°F | 0" | 0" |
| 1995 | 78°F | 59°F | 4.8" | 0" |
| 1994 | 59°F | 49°F | 0.36" | 0" |
| 1993 | 63°F | 49°F | 0" | 0" |
| 1992 | 64°F | 47°F | 0" | 0" |
| 1991 | 61°F | 45°F | 0" | 0" |
| 1990 | 74°F | 60°F | 0.08" | 0" |
| 1989 | 64°F | 53°F | 0.64" | 0" |
| 1988 | 72°F | 52°F | 0" | 0" |
| 1983 | 75°F | 61°F | 0" | 0" |
| 1981 | 76°F | 62°F | 0" | 0" |
| 1980 | 70°F | 49°F | 0.03" | 0" |
| 1979 | 66°F | 53°F | 2.01" | 0" |
| 1978 | 68°F | 44°F | 0" | 0" |
| 1977 | 78°F | 59°F | 1.57" | 0" |
| 1976 | 64°F | 51°F | 0" | 0" |
| 1975 | 70°F | 53°F | 0" | 0" |
| 1974 | 58°F | 46°F | 0" | 0" |
| 1973 | 82°F | 62°F | 0" | 0" |
| 1972 | 74°F | 61°F | 0.28" | 0" |
| 1971 | 66°F | 44°F | 0.03" | 0" |