Weather on August 20 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
August 20th in Mount Rainier National Park (via Seattle, WA) typically brings pleasant summer weather, with average highs around 75°F and lows near 58°F. Over 54 years of records, the warmest August 20th was in 2016 (76°F average), while the coldest was 1973 (60°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 20% of August 20th dates historically, with the wettest August 20th recording 1.02" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Mount Rainier? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 75°F | 61°F | 0" | -- |
| 2024 | 70°F | 61°F | 0.15" | -- |
| 2023 | 77°F | 58°F | 0" | -- |
| 2022 | 78°F | 63°F | 0" | -- |
| 2021 | 66°F | 58°F | 0" | -- |
| 2020 | 80°F | 64°F | 0.05" | -- |
| 2019 | 83°F | 57°F | 0" | -- |
| 2018 | 81°F | 59°F | 0" | -- |
| 2017 | 76°F | 57°F | 0" | -- |
| 2016 | 91°F | 60°F | 0" | 0" |
| 2015 | 75°F | 61°F | 0" | -- |
| 2014 | 73°F | 60°F | 0" | -- |
| 2013 | 77°F | 62°F | 0" | -- |
| 2012 | 77°F | 60°F | 0" | -- |
| 2011 | 82°F | 57°F | 0" | -- |
| 2010 | 70°F | 55°F | 0" | -- |
| 2009 | 82°F | 62°F | 0" | -- |
| 2008 | 69°F | 58°F | 1.02" | -- |
| 2007 | 67°F | 58°F | 0.86" | -- |
| 2006 | 83°F | 55°F | 0" | -- |
| 2005 | 80°F | 56°F | 0" | -- |
| 2004 | 80°F | 60°F | 0" | -- |
| 2003 | 79°F | 54°F | 0" | -- |
| 2002 | 69°F | 56°F | 0.03" | -- |
| 2001 | 74°F | 56°F | 0" | -- |
| 2000 | 69°F | 54°F | 0" | -- |
| 1999 | 78°F | 57°F | 0" | -- |
| 1997 | 67°F | 59°F | 0.28" | 0" |
| 1996 | 71°F | 55°F | 0.51" | 0" |
| 1995 | 78°F | 52°F | 0" | 0" |
| 1994 | 75°F | 59°F | 0" | 0" |
| 1993 | 74°F | 59°F | 0" | 0" |
| 1992 | 76°F | 55°F | 0" | 0" |
| 1991 | 84°F | 59°F | 0" | 0" |
| 1990 | 77°F | 59°F | 0" | 0" |
| 1989 | 72°F | 61°F | 0.13" | 0" |
| 1988 | 67°F | 53°F | 0" | 0" |
| 1987 | 67°F | 54°F | 0" | 0" |
| 1986 | 81°F | 58°F | 0" | 0" |
| 1985 | 70°F | 57°F | 0" | 0" |
| 1984 | 75°F | 53°F | 0" | 0" |
| 1983 | 74°F | 55°F | 0" | 0" |
| 1982 | 81°F | 61°F | 0.05" | 0" |
| 1981 | 70°F | 62°F | 0" | 0" |
| 1980 | 69°F | 55°F | 0" | 0" |
| 1979 | 73°F | 58°F | 0.03" | 0" |
| 1978 | 66°F | 57°F | 0" | 0" |
| 1977 | 77°F | 59°F | 0" | 0" |
| 1976 | 70°F | 56°F | 0.05" | 0" |
| 1975 | 71°F | 57°F | 0" | 0" |
| 1974 | 68°F | 58°F | 0" | 0" |
| 1973 | 69°F | 52°F | 0" | 0" |
| 1972 | 72°F | 57°F | 0" | 0" |
| 1971 | 76°F | 64°F | 0" | 0" |