Weather on July 15 at Isle Royale
Isle Royale National Park
MIMidwest800 ft elevation
Avg High77°F
Avg Low56°F
Warmest198379°F
Coldest201653°F
Based on 50 years of data from Houghton, MI
Planning Your Visit
July 15th in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 77°F and lows near 56°F. Over 50 years of records, the warmest July 15th was in 1983 (79°F average), while the coldest was 2016 (53°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 26% of July 15th dates historically, with the wettest July 15th recording 4.52" of rain. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for July 15th in Isle Royale? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 84°F | 60°F | 4.52" | -- |
| 2024 | 83°F | 58°F | 0.46" | -- |
| 2023 | 73°F | 53°F | 0" | -- |
| 2022 | 82°F | 56°F | 0" | -- |
| 2021 | 77°F | 55°F | 0" | -- |
| 2020 | 81°F | 58°F | 0" | -- |
| 2019 | 90°F | 65°F | 3.33" | -- |
| 2018 | 86°F | 61°F | 0" | -- |
| 2017 | 76°F | 59°F | 0" | -- |
| 2016 | 62°F | 44°F | 0" | -- |
| 2015 | 71°F | 49°F | 0" | -- |
| 2014 | 59°F | 49°F | 0.25" | -- |
| 2013 | 82°F | 59°F | 0" | -- |
| 2012 | 82°F | 61°F | 0" | -- |
| 2011 | 74°F | 58°F | 0.2" | -- |
| 2010 | 75°F | 65°F | 0" | -- |
| 2009 | 73°F | 54°F | 1.7" | -- |
| 2008 | 76°F | 54°F | 0.53" | -- |
| 2007 | 70°F | 50°F | 0" | -- |
| 2006 | 92°F | 63°F | 0" | -- |
| 2005 | 85°F | 55°F | 0" | -- |
| 2004 | 77°F | 57°F | 0" | -- |
| 2003 | 65°F | 49°F | 0.99" | -- |
| 2002 | 88°F | 68°F | 0" | 0" |
| 2001 | 85°F | 59°F | 1.07" | 0" |
| 2000 | 78°F | 57°F | 0" | 0" |
| 1999 | 82°F | 66°F | 0" | 0" |
| 1998 | 88°F | 65°F | 0.46" | 0" |
| 1997 | 83°F | 63°F | 0" | 0" |
| 1996 | 71°F | 54°F | 0" | 0" |
| 1995 | 81°F | 56°F | 0" | 0" |
| 1994 | 73°F | 47°F | 0" | 0" |
| 1993 | 74°F | 52°F | 0" | 0" |
| 1992 | 73°F | 50°F | 1.73" | 0" |
| 1991 | 86°F | 59°F | 0" | 0" |
| 1990 | 67°F | 53°F | 0.03" | 0" |
| 1989 | 76°F | 45°F | 0" | 0" |
| 1988 | 79°F | 55°F | 1.22" | 0" |
| 1983 | 91°F | 67°F | 0" | 0" |
| 1981 | 75°F | 51°F | 0" | 0" |
| 1980 | 78°F | 64°F | 0" | 0" |
| 1979 | 78°F | 55°F | 0" | 0" |
| 1978 | 69°F | 53°F | 0" | 0" |
| 1977 | 76°F | 60°F | 0" | 0" |
| 1976 | 72°F | 56°F | 0" | 0" |
| 1975 | 90°F | 58°F | 0" | 0" |
| 1974 | 67°F | 55°F | 0" | 0" |
| 1973 | 69°F | 49°F | 0" | 0" |
| 1972 | 73°F | 52°F | 0" | 0" |
| 1971 | 72°F | 55°F | 0" | 0" |
July 15 at Nearby Parks
Holiday Weather at Isle Royale
Official NPS WebsiteVisit nps.gov/isro for park information, alerts, and reservations
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