Weather on June 21 at Isle Royale
Isle Royale National Park
Based on 50 years of data from Houghton, MI
Planning Your Visit
June 21st in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 73°F and lows near 52°F. Over 50 years of records, the warmest June 21st was in 2022 (77°F average), while the coldest was 1992 (48°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 40% of June 21st dates historically, with the wettest June 21st recording 6.15" of rain. The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
Planning for June 21st 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 | 86°F | 60°F | 6.15" | -- |
| 2024 | 69°F | 48°F | 0" | -- |
| 2023 | 84°F | 52°F | 0" | -- |
| 2022 | 85°F | 69°F | 0.18" | -- |
| 2021 | 58°F | 44°F | 0.43" | -- |
| 2020 | 79°F | 52°F | 0.38" | -- |
| 2019 | 64°F | 47°F | 0" | -- |
| 2018 | 66°F | 49°F | 0" | -- |
| 2017 | 71°F | 51°F | 0.03" | -- |
| 2016 | 71°F | 47°F | 0" | -- |
| 2015 | 68°F | 46°F | 0" | -- |
| 2014 | 57°F | 46°F | 1.8" | -- |
| 2013 | 66°F | 52°F | 1.73" | 0" |
| 2012 | 69°F | 51°F | 0" | -- |
| 2011 | 60°F | 50°F | 0.53" | -- |
| 2010 | 75°F | 51°F | 0.56" | -- |
| 2009 | 76°F | 54°F | 0" | -- |
| 2008 | 72°F | 52°F | 0" | -- |
| 2007 | 70°F | 44°F | 0" | -- |
| 2006 | 83°F | 55°F | 0.66" | -- |
| 2005 | 75°F | 52°F | 0" | -- |
| 2004 | 69°F | 51°F | 0" | -- |
| 2003 | 80°F | 47°F | 0" | 0" |
| 2002 | 75°F | 57°F | 0" | 0" |
| 2001 | 71°F | 50°F | 0.48" | 0" |
| 2000 | 75°F | 58°F | 0.23" | 0" |
| 1999 | 77°F | 56°F | 0" | 0" |
| 1998 | 82°F | 66°F | 0" | 0" |
| 1997 | 82°F | 56°F | 0" | 0" |
| 1996 | 76°F | 52°F | 0.53" | 0" |
| 1995 | 87°F | 56°F | 0" | 0" |
| 1994 | 81°F | 57°F | 0" | 0" |
| 1993 | 81°F | 48°F | 0" | 0" |
| 1992 | 59°F | 37°F | 0" | 0" |
| 1991 | 60°F | 48°F | 0.05" | 0" |
| 1990 | 65°F | 51°F | 0.05" | 0" |
| 1989 | 76°F | 59°F | 0" | 0" |
| 1988 | 85°F | 59°F | 0" | 0" |
| 1983 | 84°F | 64°F | 0.56" | 0" |
| 1981 | 59°F | 45°F | 0" | 0" |
| 1980 | 76°F | 56°F | 0.05" | 0" |
| 1979 | 65°F | 47°F | 0.41" | 0" |
| 1978 | 62°F | 46°F | 0.03" | 0" |
| 1977 | 76°F | 49°F | 0" | 0" |
| 1976 | 88°F | 58°F | 0" | 0" |
| 1975 | 91°F | 61°F | 1.02" | 0" |
| 1974 | 72°F | 50°F | 0" | 0" |
| 1973 | 65°F | 52°F | 0" | 0" |
| 1972 | 65°F | 38°F | 0" | 0" |
| 1971 | 65°F | 50°F | 0" | 0" |