Weather on May 21 at Glacier
Glacier National Park
Based on 55 years of data from Kalispell, MT
Elevation Note: Glacier sits at 4,500 ft. Expect temperatures 16°F cooler than the data shown below, which comes from Kalispell, MT at a lower elevation.
Planning Your Visit
May 21st in Glacier National Park (via Kalispell, MT) typically brings mild spring weather, with average highs around 66°F and lows near 40°F — a 26°F daily swing. Over 55 years of records, the warmest May 21st was in 1980 (70°F average), while the coldest was 1987 (42°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 36% of May 21st dates historically, with the wettest May 21st recording 2.54" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 21st in Glacier? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 58°F | 35°F | 0.36" | 0" |
| 2024 | 64°F | 34°F | 0.03" | 0" |
| 2023 | 82°F | 47°F | 0" | 0" |
| 2022 | 57°F | 30°F | 0" | 0" |
| 2021 | 48°F | 40°F | 0" | 0" |
| 2020 | 56°F | 40°F | 1.68" | 0" |
| 2019 | 64°F | 41°F | 0" | 0" |
| 2018 | 75°F | 48°F | 0" | 0" |
| 2017 | 72°F | 35°F | 0" | 0" |
| 2016 | 61°F | 46°F | 1.55" | 0" |
| 2015 | 80°F | 36°F | 0" | 0" |
| 2014 | 74°F | 37°F | 0" | 0" |
| 2013 | 78°F | 44°F | 0" | 0" |
| 2012 | 61°F | 47°F | 1.24" | 0" |
| 2011 | 73°F | 45°F | 0" | 0" |
| 2010 | 57°F | 35°F | 0" | 0" |
| 2009 | 64°F | 28°F | 0" | 0" |
| 2008 | 53°F | 47°F | 0.25" | 0" |
| 2007 | 56°F | 43°F | 0.05" | 0" |
| 2006 | 75°F | 43°F | 0" | 0" |
| 2005 | 62°F | 43°F | 0.36" | 0" |
| 2004 | 53°F | 47°F | 0.13" | -- |
| 2003 | 58°F | 47°F | 0" | -- |
| 2002 | 55°F | 45°F | 2.54" | -- |
| 2001 | 73°F | 25°F | 0" | -- |
| 2000 | 73°F | 56°F | 0" | -- |
| 1999 | 67°F | 37°F | 0" | 0" |
| 1998 | 65°F | 47°F | 0.46" | 0" |
| 1997 | 68°F | 30°F | 0" | 0" |
| 1996 | 62°F | 28°F | 0.03" | 0" |
| 1995 | 60°F | 44°F | 0" | 0" |
| 1994 | 59°F | 39°F | 0.05" | 0" |
| 1993 | 66°F | 47°F | 0.08" | 0" |
| 1992 | 64°F | 32°F | 0" | 0" |
| 1991 | 63°F | 40°F | 0" | 0" |
| 1990 | 61°F | 39°F | 0" | 0" |
| 1989 | 65°F | 30°F | 0" | 0" |
| 1988 | 75°F | 39°F | 0" | 0" |
| 1987 | 52°F | 32°F | 0" | 0" |
| 1986 | 61°F | 44°F | 1.57" | 0" |
| 1985 | 80°F | 46°F | 0" | 0" |
| 1984 | 58°F | 34°F | 0" | 0" |
| 1983 | 70°F | 41°F | 0" | 0" |
| 1982 | 73°F | 32°F | 0" | 0" |
| 1981 | 68°F | 50°F | 0.23" | 0" |
| 1980 | 87°F | 53°F | 0" | 0" |
| 1979 | 76°F | 45°F | 0" | 0" |
| 1978 | 69°F | 44°F | 0.36" | 0" |
| 1977 | 64°F | 39°F | 0.08" | 0" |
| 1976 | 71°F | 33°F | 0" | 0" |
| 1975 | 66°F | 30°F | 0" | 0" |
| 1974 | 61°F | 41°F | 0" | -- |
| 1973 | 67°F | 36°F | 0" | -- |
| 1972 | 66°F | 42°F | 0.13" | -- |
| 1971 | 62°F | 34°F | 0.03" | -- |