Weather on May 9 at Isle Royale
Isle Royale National Park
Based on 51 years of data from Houghton, MI
Planning Your Visit
May 9th in Isle Royale National Park (via Houghton, MI) typically brings cool spring weather, with average highs around 57°F and lows near 37°F. Over 51 years of records, the warmest May 9th was in 1993 (71°F average), while the coldest was 2009 (34°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 9th dates historically, with the wettest May 9th recording 1.85" of rain. The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.5°F cooler on this date compared to 20-30 years ago.
Planning for May 9th in Isle Royale? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 54°F | 36°F | 0" | -- |
| 2025 | 80°F | 29°F | 0" | -- |
| 2024 | 55°F | 35°F | 0" | -- |
| 2023 | 69°F | 42°F | 0" | -- |
| 2022 | 76°F | 49°F | 0" | -- |
| 2021 | 47°F | 31°F | 0" | -- |
| 2020 | 48°F | 23°F | 0" | -- |
| 2019 | 38°F | 33°F | 1.45" | -- |
| 2018 | 54°F | 41°F | 0.38" | -- |
| 2017 | 52°F | 29°F | 0" | -- |
| 2016 | 54°F | 33°F | 0" | -- |
| 2015 | 51°F | 38°F | 0" | -- |
| 2014 | 69°F | 39°F | 0.33" | -- |
| 2013 | 48°F | 37°F | 0.13" | -- |
| 2012 | 58°F | 35°F | 0" | -- |
| 2011 | 65°F | 43°F | 0.61" | -- |
| 2010 | 50°F | 23°F | 0" | -- |
| 2009 | 36°F | 32°F | 0" | -- |
| 2008 | 50°F | 32°F | 0" | -- |
| 2007 | 76°F | 52°F | 0" | -- |
| 2006 | 59°F | 50°F | 1.57" | -- |
| 2005 | 75°F | 54°F | 0.33" | -- |
| 2004 | 63°F | 36°F | 0" | -- |
| 2003 | 43°F | 37°F | 0.86" | -- |
| 2002 | 46°F | 33°F | 1.45" | 0" |
| 2001 | 70°F | 35°F | 0" | 0" |
| 2000 | 57°F | 41°F | 0" | 0" |
| 1999 | 58°F | 30°F | 0" | 0" |
| 1998 | 61°F | 41°F | 0" | 0" |
| 1997 | 55°F | 33°F | 1.24" | 0" |
| 1996 | 63°F | 37°F | 0" | 0" |
| 1995 | 54°F | 37°F | 1.5" | 0" |
| 1994 | 58°F | 40°F | 0.15" | 0" |
| 1993 | 87°F | 55°F | 0.05" | 0" |
| 1992 | 58°F | 43°F | 0" | 0" |
| 1991 | 59°F | 35°F | 0" | 0" |
| 1990 | 41°F | 35°F | 0" | 0" |
| 1989 | 56°F | 36°F | 0" | 0" |
| 1988 | 66°F | 40°F | 0.28" | 0" |
| 1982 | 52°F | 37°F | 0" | 0" |
| 1981 | 50°F | 25°F | 0.05" | 0" |
| 1980 | 51°F | 37°F | 0" | 0" |
| 1979 | 43°F | 36°F | 1.85" | 0" |
| 1978 | 45°F | 40°F | 0.53" | 0" |
| 1977 | 51°F | 30°F | 0" | 0" |
| 1976 | 71°F | 44°F | 0" | 0" |
| 1975 | 69°F | 44°F | 0" | 0" |
| 1974 | 56°F | 37°F | 0" | 0" |
| 1973 | 60°F | 44°F | 0.33" | 0" |
| 1972 | 55°F | 31°F | 0" | 0" |
| 1971 | 62°F | 32°F | 0" | 0" |