Weather on April 18 at Isle Royale
Isle Royale National Park
Based on 51 years of data from Houghton, MI
Planning Your Visit
April 18th in Isle Royale National Park (via Houghton, MI) typically brings chilly spring weather, with average highs around 49°F and lows near 31°F. Over 51 years of records, the warmest April 18th was in 1977 (58°F average), while the coldest was 2011 (21°F) — a 37°F range across recorded history. Precipitation has occurred on 47% of recorded April 18th dates, with snow falling 8% of the time (heaviest snowfall: 4"). The last decade has been 4.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.1°F cooler on this date compared to 20-30 years ago.
Planning for April 18th 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 | 36°F | 29°F | 0.13" | -- |
| 2025 | 42°F | 36°F | 0.2" | -- |
| 2024 | 47°F | 37°F | 2.41" | 0" |
| 2023 | 39°F | 28°F | 0.13" | -- |
| 2022 | 36°F | 30°F | 0.15" | -- |
| 2021 | 58°F | 27°F | 0" | -- |
| 2020 | 56°F | 31°F | 0.15" | -- |
| 2019 | 43°F | 31°F | 0.25" | -- |
| 2018 | 40°F | 26°F | 0" | -- |
| 2017 | 49°F | 29°F | 0.74" | -- |
| 2016 | 48°F | 32°F | 0.48" | -- |
| 2015 | 49°F | 33°F | 0" | -- |
| 2014 | 36°F | 26°F | 0" | -- |
| 2013 | 34°F | 30°F | 1.57" | -- |
| 2012 | 47°F | 30°F | 1.88" | -- |
| 2011 | 32°F | 11°F | 0" | -- |
| 2010 | 51°F | 29°F | 0" | -- |
| 2009 | 52°F | 36°F | 0" | -- |
| 2008 | 50°F | 32°F | 0.05" | -- |
| 2007 | 50°F | 37°F | 0" | -- |
| 2006 | 57°F | 34°F | 0" | -- |
| 2005 | 75°F | 38°F | 0" | -- |
| 2004 | 55°F | 35°F | 2.79" | -- |
| 2003 | 39°F | 24°F | 0" | -- |
| 2002 | 50°F | 39°F | 0.86" | -- |
| 2001 | 50°F | 31°F | 0" | 0" |
| 2000 | 51°F | 32°F | 0.03" | 0" |
| 1999 | 47°F | 33°F | 0" | 0" |
| 1998 | 53°F | 28°F | 0" | 0" |
| 1997 | 41°F | 22°F | 0" | 0" |
| 1996 | 60°F | 33°F | 0" | 0" |
| 1995 | 46°F | 31°F | 1.73" | 3.6" |
| 1994 | 77°F | 33°F | 0" | 0" |
| 1993 | 42°F | 31°F | 1.07" | 0" |
| 1992 | 53°F | 34°F | 0" | 0" |
| 1991 | 53°F | 33°F | 0" | 0" |
| 1990 | 58°F | 33°F | 0" | 0" |
| 1989 | 45°F | 25°F | 0" | 0" |
| 1988 | 35°F | 24°F | 0.03" | 0.2" |
| 1982 | 40°F | 22°F | 0.94" | 4" |
| 1981 | 47°F | 24°F | 0" | 0" |
| 1980 | 56°F | 37°F | 0" | 0" |
| 1979 | 52°F | 33°F | 0" | 0" |
| 1978 | 40°F | 30°F | 0.03" | 0" |
| 1977 | 72°F | 45°F | 0.13" | 0" |
| 1976 | 65°F | 45°F | 1.14" | 0" |
| 1975 | 39°F | 33°F | 0.41" | 0" |
| 1974 | 38°F | 24°F | 0" | 0" |
| 1973 | 60°F | 33°F | 0" | 0" |
| 1972 | 39°F | 31°F | 0.3" | 1.2" |
| 1971 | 49°F | 31°F | 0" | 0" |