Weather on August 21
Renton, WA
55 Years of Data
Avg High
76°F
Avg Low
55°F
Warmest
2018
76°F avg
Coldest
1980
57°F avg
About This Date
August 21st in Renton, WA typically brings pleasant summer weather, with average highs around 76°F and lows near 55°F. Over 55 years of records, the warmest August 21st was in 2018 (76°F average), while the coldest was 1980 (57°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 24% of August 21st dates historically, with the wettest August 21st recording 1.78" 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 August 21st in Renton, WA? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 53° | 66° | — | — |
| 2024 | 71° | 59° | 65° | — | — |
| 2023 | 77° | 56° | 66° | — | — |
| 2022 | 83° | 65° | 74° | — | — |
| 2021 | 70° | 58° | 64° | — | — |
| 2020 | 73° | 61° | 67° | 0.15" | — |
| 2019 | 70° | 60° | 65° | 0.79" | — |
| 2018warmest | 89° | 62° | 76° | — | — |
| 2017 | 82° | 60° | 71° | — | — |
| 2016 | 74° | 59° | 66° | — | — |
| 2015 | 73° | 57° | 65° | — | — |
| 2014 | 73° | 55° | 64° | — | — |
| 2013 | 80° | 54° | 67° | — | — |
| 2012 | 76° | 59° | 67° | — | — |
| 2011 | 87° | 59° | 73° | — | — |
| 2010 | 72° | 52° | 62° | — | — |
| 2009 | 70° | 61° | 65° | — | — |
| 2008 | 70° | 55° | 62° | 0.05" | — |
| 2007 | 73° | 61° | 67° | 0.08" | — |
| 2006 | 79° | 57° | 68° | — | — |
| 2005 | 77° | 56° | 66° | — | — |
| 2004 | 75° | 64° | 70° | 0.36" | — |
| 2003 | 84° | 56° | 70° | — | — |
| 2002 | 71° | 57° | 64° | — | — |
| 2001 | 66° | 55° | 61° | 1.3" | — |
| 2000 | 75° | 52° | 63° | — | — |
| 1999 | 77° | 64° | 71° | — | — |
| 1998 | 81° | 57° | 69° | — | — |
| 1997 | 78° | 61° | 69° | 0.03" | — |
| 1996 | 75° | 51° | 63° | — | — |
| 1995 | 79° | 56° | 67° | — | — |
| 1994 | 80° | 61° | 70° | — | — |
| 1993 | 69° | 56° | 62° | 0.03" | — |
| 1992 | 74° | 53° | 63° | — | — |
| 1991 | 85° | 59° | 72° | — | — |
| 1990 | 65° | 60° | 62° | 0.3" | — |
| 1989 | 74° | 59° | 66° | 1.78" | — |
| 1988 | 76° | 44° | 60° | — | — |
| 1987 | 75° | 43° | 59° | — | — |
| 1986 | 87° | 57° | 72° | — | — |
| 1985 | 73° | 43° | 58° | — | — |
| 1984 | 83° | 46° | 64° | — | — |
| 1983 | 78° | 46° | 62° | — | — |
| 1982 | 81° | 50° | 65° | — | — |
| 1981 | 77° | 51° | 64° | — | — |
| 1980coldest | 72° | 42° | 57° | — | — |
| 1979 | 74° | 59° | 66° | 0.84" | — |
| 1978 | 74° | 56° | 65° | — | — |
| 1977 | 79° | 58° | 68° | — | — |
| 1976 | 73° | 46° | 60° | — | — |
| 1975 | 70° | 56° | 63° | — | — |
| 1974 | 74° | 50° | 62° | — | — |
| 1973 | 72° | 46° | 59° | — | — |
| 1972 | 72° | 50° | 61° | 0.58" | — |
| 1971 | 80° | 59° | 70° | 0.03" | — |
55 years of data from RENTON MUNI AP