Weather on September 12 at Mount Rainier
Mount Rainier National Park
Based on 54 years of data from Seattle, WA
Elevation Note: Mount Rainier sits at 5,400 ft. Expect temperatures 19°F cooler than the data shown below, which comes from Seattle, WA at a lower elevation.
Planning Your Visit
September 12th in Mount Rainier National Park (via Seattle, WA) typically brings pleasant fall weather, with average highs around 71°F and lows near 55°F. Over 54 years of records, the warmest September 12th was in 2015 (71°F average), while the coldest was 1982 (57°F) — a 14°F range across recorded history. Rain or other precipitation has occurred on about 13% of September 12th dates historically, with the wettest September 12th recording 0.74" 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 September 12th in Mount Rainier? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 72°F | 60°F | 0" | -- |
| 2024 | 71°F | 57°F | 0" | -- |
| 2023 | 69°F | 56°F | 0" | -- |
| 2022 | 74°F | 61°F | 0" | -- |
| 2021 | 67°F | 56°F | 0.03" | -- |
| 2020 | 62°F | 53°F | 0" | -- |
| 2019 | 80°F | 58°F | 0.36" | -- |
| 2018 | 68°F | 56°F | 0" | -- |
| 2017 | 76°F | 59°F | 0" | -- |
| 2016 | 74°F | 55°F | 0" | -- |
| 2015 | 81°F | 61°F | 0" | -- |
| 2014 | 76°F | 55°F | 0" | -- |
| 2013 | 80°F | 61°F | 0" | -- |
| 2012 | 68°F | 50°F | 0" | -- |
| 2011 | 70°F | 58°F | 0" | -- |
| 2010 | 73°F | 58°F | 0" | -- |
| 2009 | 83°F | 57°F | 0" | -- |
| 2008 | 74°F | 53°F | 0" | -- |
| 2007 | 71°F | 56°F | 0" | -- |
| 2006 | 74°F | 56°F | 0" | -- |
| 2005 | 68°F | 56°F | 0" | -- |
| 2004 | 68°F | 54°F | 0.51" | -- |
| 2003 | 69°F | 53°F | 0" | -- |
| 2002 | 80°F | 56°F | 0" | -- |
| 2001 | 76°F | 53°F | 0" | -- |
| 2000 | 74°F | 51°F | 0" | -- |
| 1999 | 79°F | 55°F | 0" | -- |
| 1997 | 69°F | 54°F | 0.74" | 0" |
| 1996 | 70°F | 57°F | 0.2" | 0" |
| 1995 | 77°F | 55°F | 0" | 0" |
| 1994 | 70°F | 49°F | 0" | 0" |
| 1993 | 70°F | 49°F | 0" | 0" |
| 1992 | 65°F | 51°F | 0" | 0" |
| 1991 | 62°F | 53°F | 0" | 0" |
| 1990 | 66°F | 54°F | 0" | 0" |
| 1989 | 78°F | 54°F | 0" | 0" |
| 1988 | 76°F | 51°F | 0" | 0" |
| 1987 | 61°F | 58°F | 0" | 0" |
| 1986 | 71°F | 50°F | 0" | 0" |
| 1985 | 70°F | 55°F | 0" | 0" |
| 1984 | 67°F | 52°F | 0" | 0" |
| 1983 | 70°F | 53°F | 0" | 0" |
| 1982 | 63°F | 51°F | 0" | 0" |
| 1981 | 72°F | 53°F | 0" | 0" |
| 1980 | 60°F | 55°F | 0.23" | 0" |
| 1979 | 75°F | 53°F | 0" | 0" |
| 1978 | 64°F | 52°F | 0" | 0" |
| 1977 | 73°F | 53°F | 0" | 0" |
| 1976 | 69°F | 55°F | 0" | 0" |
| 1975 | 80°F | 55°F | 0" | 0" |
| 1974 | 75°F | 53°F | 0" | 0" |
| 1973 | 65°F | 53°F | 0.18" | 0" |
| 1972 | 69°F | 53°F | 0" | 0" |
| 1971 | 74°F | 53°F | 0" | 0" |