Weather on August 21 at North Cascades
North Cascades National Park
Based on 54 years of data from Seattle, WA
Elevation Note: North Cascades sits at 4,200 ft. Expect temperatures 15°F cooler than the data shown below, which comes from Seattle, WA at a lower elevation.
Planning Your Visit
August 21st in North Cascades National Park (via Seattle, WA) typically brings pleasant summer weather, with average highs around 74°F and lows near 57°F. Over 54 years of records, the warmest August 21st was in 2018 (75°F average), while the coldest was 1973 (60°F) — a 15°F range across recorded history. Rain or other precipitation has occurred on about 20% of August 21st dates historically, with the wettest August 21st recording 1.73" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in North Cascades? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 76°F | 57°F | 0" | -- |
| 2024 | 71°F | 60°F | 0" | -- |
| 2023 | 76°F | 54°F | 0" | -- |
| 2022 | 81°F | 63°F | 0" | -- |
| 2021 | 70°F | 56°F | 0" | -- |
| 2020 | 73°F | 62°F | 0" | -- |
| 2019 | 71°F | 60°F | 0.25" | -- |
| 2018 | 87°F | 63°F | 0" | -- |
| 2017 | 81°F | 57°F | 0" | -- |
| 2016 | 74°F | 58°F | 0" | 0" |
| 2015 | 75°F | 61°F | 0" | -- |
| 2014 | 73°F | 57°F | 0" | -- |
| 2013 | 80°F | 58°F | 0" | -- |
| 2012 | 73°F | 58°F | 0" | -- |
| 2011 | 87°F | 60°F | 0" | -- |
| 2010 | 72°F | 54°F | 0.03" | -- |
| 2009 | 70°F | 60°F | 0" | -- |
| 2008 | 69°F | 57°F | 0" | -- |
| 2007 | 73°F | 61°F | 0.08" | -- |
| 2006 | 78°F | 55°F | 0" | -- |
| 2005 | 76°F | 56°F | 0" | -- |
| 2004 | 75°F | 63°F | 0.38" | -- |
| 2003 | 84°F | 59°F | 0" | -- |
| 2002 | 71°F | 56°F | 0" | -- |
| 2001 | 66°F | 57°F | 1.14" | -- |
| 2000 | 69°F | 50°F | 0" | -- |
| 1999 | 74°F | 60°F | 0" | -- |
| 1997 | 80°F | 61°F | 0" | 0" |
| 1996 | 75°F | 52°F | 0" | 0" |
| 1995 | 74°F | 56°F | 0" | 0" |
| 1994 | 73°F | 61°F | 0" | 0" |
| 1993 | 73°F | 57°F | 0" | 0" |
| 1992 | 73°F | 54°F | 0.05" | 0" |
| 1991 | 84°F | 59°F | 0" | 0" |
| 1990 | 68°F | 63°F | 0.36" | 0" |
| 1989 | 72°F | 59°F | 1.73" | 0" |
| 1988 | 73°F | 51°F | 0" | 0" |
| 1987 | 72°F | 49°F | 0" | 0" |
| 1986 | 86°F | 56°F | 0" | 0" |
| 1985 | 70°F | 55°F | 0" | 0" |
| 1984 | 80°F | 54°F | 0" | 0" |
| 1983 | 75°F | 56°F | 0" | 0" |
| 1982 | 79°F | 58°F | 0" | 0" |
| 1981 | 78°F | 60°F | 0" | 0" |
| 1980 | 68°F | 52°F | 0" | 0" |
| 1979 | 71°F | 61°F | 0.41" | 0" |
| 1978 | 72°F | 58°F | 0" | 0" |
| 1977 | 65°F | 60°F | 0" | 0" |
| 1976 | 69°F | 55°F | 0" | 0" |
| 1975 | 68°F | 58°F | 0" | 0" |
| 1974 | 72°F | 57°F | 0" | 0" |
| 1973 | 72°F | 48°F | 0" | 0" |
| 1972 | 70°F | 57°F | 0.53" | 0" |
| 1971 | 74°F | 59°F | 0.05" | 0" |