Weather on August 17 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
August 17th in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 74°F and lows near 56°F. Over 50 years of records, the warmest August 17th was in 2008 (75°F average), while the coldest was 2007 (51°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 28% of August 17th dates historically, with the wettest August 17th recording 3.84" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for August 17th in Isle Royale? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 64°F | 54°F | 0" | -- |
| 2024 | 72°F | 64°F | 0" | -- |
| 2023 | 68°F | 53°F | 0.08" | -- |
| 2022 | 81°F | 56°F | 0" | -- |
| 2021 | 87°F | 61°F | 0" | -- |
| 2020 | 71°F | 53°F | 0" | -- |
| 2019 | 82°F | 52°F | 0" | -- |
| 2018 | 73°F | 55°F | 0" | -- |
| 2017 | 67°F | 57°F | 3.84" | -- |
| 2016 | 81°F | 55°F | 0" | -- |
| 2015 | 71°F | 55°F | 0.03" | -- |
| 2014 | 62°F | 51°F | 0" | -- |
| 2013 | 79°F | 53°F | 0" | -- |
| 2012 | 66°F | 51°F | 0" | -- |
| 2011 | 77°F | 65°F | 0.13" | -- |
| 2010 | 66°F | 54°F | 0" | -- |
| 2009 | 83°F | 58°F | 0.03" | -- |
| 2008 | 86°F | 64°F | 0" | -- |
| 2007 | 62°F | 39°F | 0" | -- |
| 2006 | 81°F | 63°F | 0" | -- |
| 2005 | 72°F | 46°F | 0.56" | -- |
| 2004 | 71°F | 51°F | 0" | -- |
| 2003 | 74°F | 56°F | 0" | -- |
| 2002 | 74°F | 59°F | 1.19" | 0" |
| 2001 | 77°F | 58°F | 0.05" | 0" |
| 2000 | 66°F | 55°F | 0" | 0" |
| 1999 | 64°F | 51°F | 0.03" | 0" |
| 1998 | 80°F | 60°F | 1.19" | 0" |
| 1997 | 66°F | 45°F | 0" | 0" |
| 1996 | 83°F | 59°F | 0" | 0" |
| 1995 | 81°F | 64°F | 0" | 0" |
| 1994 | 81°F | 56°F | 0" | 0" |
| 1993 | 78°F | 60°F | 0" | 0" |
| 1992 | 78°F | 51°F | 0.43" | 0" |
| 1991 | 73°F | 60°F | 0.23" | 0" |
| 1990 | 81°F | 62°F | 0" | 0" |
| 1989 | 72°F | 47°F | 0" | 0" |
| 1988 | 68°F | 60°F | 2.41" | 0" |
| 1983 | 81°F | 63°F | 0" | 0" |
| 1981 | 71°F | 47°F | 0" | 0" |
| 1980 | 70°F | 61°F | 0.1" | 0" |
| 1979 | 63°F | 51°F | 0" | 0" |
| 1978 | 67°F | 57°F | 0" | 0" |
| 1977 | 61°F | 47°F | 0" | 0" |
| 1976 | 80°F | 54°F | 0" | 0" |
| 1975 | 65°F | 51°F | 0" | 0" |
| 1974 | 74°F | 56°F | 0" | 0" |
| 1973 | 81°F | 59°F | 0" | 0" |
| 1972 | 78°F | 62°F | 0" | 0" |
| 1971 | 82°F | 61°F | 0" | 0" |