Weather on August 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
August 21st in Glacier National Park (via Kalispell, MT) typically brings pleasant summer weather, with average highs around 79°F and lows near 47°F — a 32°F daily swing. Over 55 years of records, the warmest August 21st was in 2004 (72°F average), while the coldest was 2000 (54°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 38% of August 21st dates historically, with the wettest August 21st recording 2.18" 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 August 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 | 83°F | 43°F | 0" | 0" |
| 2024 | 73°F | 51°F | 0.1" | 0" |
| 2023 | 70°F | 61°F | 1.83" | 0" |
| 2022 | 88°F | 54°F | 0" | 0" |
| 2021 | 64°F | 50°F | 0.33" | 0" |
| 2020 | 89°F | 43°F | 0" | 0" |
| 2019 | 93°F | 49°F | 0.03" | 0" |
| 2018 | 77°F | 37°F | 0" | 0" |
| 2017 | 80°F | 39°F | 0" | 0" |
| 2016 | 92°F | 42°F | 0" | 0" |
| 2015 | 74°F | 46°F | 0.08" | 0" |
| 2014 | 67°F | 54°F | 0.3" | 0" |
| 2013 | 85°F | 37°F | 0" | 0" |
| 2012 | 74°F | 48°F | 0.08" | 0" |
| 2011 | 87°F | 39°F | 0" | 0" |
| 2010 | 85°F | 40°F | 0" | 0" |
| 2009 | 90°F | 54°F | 0" | 0" |
| 2008 | 69°F | 53°F | 0.51" | 0" |
| 2007 | 73°F | 45°F | 0.03" | 0" |
| 2006 | 88°F | 44°F | 0" | 0" |
| 2005 | 91°F | 43°F | 0" | 0" |
| 2004 | 86°F | 57°F | 0" | -- |
| 2003 | 87°F | 38°F | 0" | -- |
| 2002 | 75°F | 52°F | 0.05" | -- |
| 2001 | 82°F | 36°F | 0" | -- |
| 2000 | 76°F | 33°F | 0" | -- |
| 1999 | 88°F | 52°F | 0.03" | -- |
| 1998 | 86°F | 49°F | 0.08" | 0" |
| 1997 | 82°F | 51°F | 0" | 0" |
| 1996 | 71°F | 41°F | 0" | 0" |
| 1995 | 85°F | 43°F | 0" | 0" |
| 1994 | 86°F | 47°F | 0" | 0" |
| 1993 | 67°F | 56°F | 0.69" | 0" |
| 1992 | 69°F | 44°F | 0.05" | 0" |
| 1991 | 93°F | 47°F | 0" | 0" |
| 1990 | 71°F | 52°F | 2.18" | 0" |
| 1989 | 66°F | 53°F | 0.51" | 0" |
| 1988 | 74°F | 38°F | 0" | 0" |
| 1987 | 74°F | 37°F | 0" | 0" |
| 1986 | 70°F | 51°F | 0" | 0" |
| 1985 | 64°F | 46°F | 1.27" | 0" |
| 1984 | 83°F | 42°F | 0" | 0" |
| 1983 | 82°F | 44°F | 0" | 0" |
| 1982 | 86°F | 49°F | 0" | 0" |
| 1981 | 79°F | 50°F | 0" | 0" |
| 1980 | 73°F | 47°F | 0.08" | 0" |
| 1979 | 85°F | 55°F | 0.43" | 0" |
| 1978 | 70°F | 50°F | 0" | 0" |
| 1977 | 86°F | 53°F | 0.1" | 0" |
| 1976 | 77°F | 44°F | 0" | 0" |
| 1975 | 75°F | 46°F | 0" | 0" |
| 1974 | 73°F | 48°F | 0.25" | -- |
| 1973 | 88°F | 52°F | 0" | -- |
| 1972 | 83°F | 53°F | 0" | -- |
| 1971 | 87°F | 48°F | 0" | -- |