Weather on July 18 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
July 18th in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 79°F and lows near 58°F. Over 50 years of records, the warmest July 18th was in 1975 (85°F average), while the coldest was 2009 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 40% of July 18th dates historically, with the wettest July 18th recording 5.08" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for July 18th 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 | 74°F | 47°F | 0.38" | -- |
| 2024 | 74°F | 46°F | 0" | -- |
| 2023 | 69°F | 48°F | 0" | -- |
| 2022 | 88°F | 58°F | 0.3" | -- |
| 2021 | 86°F | 57°F | 0" | -- |
| 2020 | 83°F | 66°F | 3.43" | -- |
| 2019 | 81°F | 66°F | 0.38" | -- |
| 2018 | 77°F | 49°F | 0" | -- |
| 2017 | 81°F | 57°F | 0.43" | -- |
| 2016 | 73°F | 50°F | 0" | -- |
| 2015 | 84°F | 61°F | 0.1" | -- |
| 2014 | 80°F | 52°F | 0" | -- |
| 2013 | 89°F | 66°F | 3.91" | -- |
| 2012 | 74°F | 59°F | 0" | -- |
| 2011 | 88°F | 69°F | 0.03" | -- |
| 2010 | 76°F | 56°F | 0" | -- |
| 2009 | 60°F | 50°F | 0" | -- |
| 2008 | 74°F | 56°F | 0" | -- |
| 2007 | 81°F | 53°F | 0.1" | -- |
| 2006 | 80°F | 53°F | 0" | -- |
| 2005 | 79°F | 59°F | 0.3" | -- |
| 2004 | 75°F | 48°F | 0" | -- |
| 2003 | 74°F | 51°F | 0" | 0" |
| 2002 | 84°F | 58°F | 0" | 0" |
| 2001 | 84°F | 68°F | 5.08" | 0" |
| 2000 | 63°F | 49°F | 0" | 0" |
| 1999 | 76°F | 57°F | 0" | 0" |
| 1998 | 82°F | 57°F | 0" | 0" |
| 1997 | 84°F | 59°F | 0" | 0" |
| 1996 | 82°F | 61°F | 0.28" | 0" |
| 1995 | 66°F | 57°F | 0.46" | 0" |
| 1994 | 77°F | 60°F | 0" | 0" |
| 1993 | 77°F | 61°F | 0.03" | 0" |
| 1992 | 68°F | 53°F | 0" | 0" |
| 1991 | 92°F | 68°F | 0" | 0" |
| 1990 | 79°F | 62°F | 0.03" | 0" |
| 1989 | 76°F | 60°F | 0" | 0" |
| 1988 | 79°F | 60°F | 0" | 0" |
| 1983 | 87°F | 60°F | 0" | 0" |
| 1981 | 75°F | 58°F | 0" | 0" |
| 1980 | 70°F | 60°F | 0.56" | 0" |
| 1979 | 78°F | 54°F | 0.23" | 0" |
| 1978 | 78°F | 61°F | 2.26" | 0" |
| 1977 | 92°F | 56°F | 0" | 0" |
| 1976 | 81°F | 62°F | 0" | 0" |
| 1975 | 98°F | 71°F | 0" | 0" |
| 1974 | 82°F | 65°F | 0" | 0" |
| 1973 | 80°F | 63°F | 0.2" | 0" |
| 1972 | 80°F | 52°F | 0.03" | 0" |
| 1971 | 67°F | 49°F | 0" | 0" |