Weather on September 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
September 21st in North Cascades National Park (via Seattle, WA) typically brings pleasant fall weather, with average highs around 70°F and lows near 52°F. Over 54 years of records, the warmest September 21st was in 2014 (71°F average), while the coldest was 1996 (53°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 21st dates historically, with the wettest September 21st recording 4.01" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in North Cascades? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 68°F | 58°F | 0.94" | -- |
| 2024 | 72°F | 49°F | 0" | -- |
| 2023 | 68°F | 45°F | 0" | -- |
| 2022 | 76°F | 48°F | 0" | -- |
| 2021 | 74°F | 52°F | 0" | -- |
| 2020 | 72°F | 53°F | 0" | -- |
| 2019 | 68°F | 58°F | -- | -- |
| 2018 | 72°F | 59°F | 0.15" | -- |
| 2017 | 64°F | 51°F | 0" | -- |
| 2016 | 68°F | 51°F | 0" | -- |
| 2015 | 67°F | 55°F | 0" | -- |
| 2014 | 84°F | 57°F | 0" | -- |
| 2013 | 71°F | 56°F | 0.03" | -- |
| 2012 | 62°F | 56°F | 0" | -- |
| 2011 | 76°F | 59°F | 0" | -- |
| 2010 | 66°F | 52°F | 0" | -- |
| 2009 | 72°F | 52°F | 0" | -- |
| 2008 | 65°F | 54°F | 0" | -- |
| 2007 | 67°F | 51°F | 0.05" | -- |
| 2006 | 61°F | 48°F | 0.58" | -- |
| 2005 | 64°F | 50°F | 0" | -- |
| 2004 | 66°F | 48°F | 0" | -- |
| 2003 | 70°F | 49°F | 0" | -- |
| 2002 | 70°F | 49°F | 0" | -- |
| 2001 | 68°F | 55°F | 0.03" | -- |
| 2000 | 68°F | 54°F | 0" | -- |
| 1999 | 78°F | 56°F | 0" | -- |
| 1997 | 75°F | 50°F | 0" | 0" |
| 1996 | 58°F | 49°F | 0.13" | 0" |
| 1995 | 84°F | 51°F | 0" | 0" |
| 1994 | 80°F | 58°F | 0" | 0" |
| 1993 | 66°F | 43°F | 0" | 0" |
| 1992 | 71°F | 57°F | 0" | 0" |
| 1991 | 66°F | 46°F | 0" | 0" |
| 1990 | 79°F | 55°F | 0" | 0" |
| 1989 | 75°F | 50°F | 0" | 0" |
| 1988 | 64°F | 48°F | 0" | 0" |
| 1987 | 77°F | 53°F | 0" | 0" |
| 1986 | 64°F | 52°F | 0" | 0" |
| 1985 | 63°F | 50°F | 0" | 0" |
| 1984 | 62°F | 52°F | 0" | 0" |
| 1983 | 77°F | 50°F | 0" | 0" |
| 1982 | 69°F | 56°F | 0" | 0" |
| 1981 | 61°F | 51°F | 1.04" | 0" |
| 1980 | 66°F | 53°F | 0.03" | 0" |
| 1979 | 68°F | 53°F | 0" | 0" |
| 1978 | 62°F | 53°F | 0.53" | 0" |
| 1977 | 61°F | 47°F | 0" | 0" |
| 1976 | 64°F | 59°F | 0" | 0" |
| 1975 | 83°F | 50°F | 0" | 0" |
| 1974 | 84°F | 56°F | 0" | 0" |
| 1973 | 68°F | 56°F | 0.03" | 0" |
| 1972 | 59°F | 49°F | 4.01" | 0" |
| 1971 | 73°F | 50°F | 0" | 0" |