Weather on August 21
Bellevue, WA
55 Years of Data
Avg High
75°F
Avg Low
57°F
Warmest
2018
76°F avg
Coldest
1976
56°F avg
About This Date
August 21st in Bellevue, WA typically brings pleasant summer weather, with average highs around 75°F and lows near 57°F. Over 54 years of records, the warmest August 21st was in 2018 (76°F average), while the coldest was 1976 (56°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 17% of August 21st dates historically, with the wettest August 21st recording 1.42" of rain. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Bellevue, WA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 54° | 65° | — | — |
| 2024 | 71° | 59° | 65° | — | — |
| 2023 | 77° | 56° | 66° | — | — |
| 2022 | 82° | 64° | 73° | — | — |
| 2021 | 72° | 57° | 64° | — | — |
| 2020 | 71° | 63° | 67° | 0.08" | — |
| 2019 | 69° | 58° | 63° | 0.51" | — |
| 2018warmest | 89° | 63° | 76° | — | — |
| 2017 | 82° | 57° | 70° | — | — |
| 2016 | 74° | 58° | 66° | — | — |
| 2015 | 73° | 57° | 65° | — | — |
| 2014 | 72° | 54° | 63° | — | — |
| 2013 | 80° | 56° | 68° | — | — |
| 2012 | 73° | 56° | 64° | — | — |
| 2011 | 88° | 58° | 73° | — | — |
| 2010 | 72° | 50° | 61° | — | — |
| 2009 | 74° | 61° | 67° | — | — |
| 2008 | 68° | 56° | 62° | 0.03" | — |
| 2007 | 76° | 61° | 68° | — | — |
| 2006 | 80° | 55° | 68° | — | — |
| 2005 | 76° | 56° | 66° | — | — |
| 2004 | 74° | 62° | 68° | 0.23" | — |
| 2003 | 84° | 55° | 70° | — | — |
| 2002 | 72° | 55° | 63° | — | — |
| 2001 | 65° | 57° | 61° | 1.14" | — |
| 2000 | 75° | 53° | 64° | — | — |
| 1999 | 75° | 57° | 66° | — | — |
| 1997 | 78° | 61° | 69° | — | — |
| 1996 | 76° | 51° | 63° | — | — |
| 1995 | 74° | 56° | 65° | — | — |
| 1994 | 75° | 60° | 68° | — | — |
| 1993 | 74° | 57° | 65° | 0.05" | — |
| 1992 | 73° | 54° | 63° | — | — |
| 1991 | 83° | 59° | 71° | — | — |
| 1990 | 69° | 62° | 66° | 0.38" | — |
| 1989 | 73° | 58° | 65° | 1.42" | — |
| 1988 | 75° | 53° | 64° | — | — |
| 1987 | 73° | 51° | 62° | — | — |
| 1986 | 86° | 56° | 71° | — | — |
| 1985 | 70° | 55° | 62° | — | — |
| 1984 | 80° | 54° | 67° | — | — |
| 1983 | 75° | 56° | 65° | — | — |
| 1982 | 87° | 59° | 73° | — | — |
| 1981 | 75° | 60° | 68° | — | — |
| 1980 | 75° | 52° | 63° | — | — |
| 1979 | 74° | 61° | 67° | — | — |
| 1978 | 75° | 58° | 66° | — | — |
| 1977 | 77° | 59° | 68° | — | — |
| 1976coldest | 59° | 53° | 56° | — | — |
| 1975 | 70° | 56° | 63° | — | — |
| 1974 | 68° | 55° | 62° | — | — |
| 1973 | 72° | 49° | 60° | — | — |
| 1972 | 74° | 57° | 65° | 0.15" | — |
| 1971 | 76° | 64° | 70° | — | — |
54 years of data from SEATTLE UNIV OF WASHIN