Weather on August 21
Renton, WA
55 Years of Data
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.
| 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" | — |
Renton, WA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Renton, WA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Renton, WA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Renton, WA
Renton, WA has no months that meet our "pleasant" threshold — every season has tradeoffs.