Weather on May 21
Renton, WA
55 Years of Data
Avg High
66°F
Avg Low
48°F
Warmest
1988
67°F avg
Coldest
2010
49°F avg
About This Date
May 21st in Renton, WA typically brings mild spring weather, with average highs around 66°F and lows near 48°F. Over 55 years of records, the warmest May 21st was in 1988 (67°F average), while the coldest was 2010 (49°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 40% of May 21st dates historically, with the wettest May 21st recording 1.35" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for May 21st in Renton, WA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 51° | 57° | — | — |
| 2024 | 54° | 48° | 51° | 0.91" | — |
| 2023 | 62° | 54° | 58° | — | — |
| 2022 | 67° | 43° | 55° | — | — |
| 2021 | 64° | 46° | 55° | — | — |
| 2020 | 57° | 47° | 52° | 0.28" | — |
| 2019 | 62° | 51° | 57° | — | — |
| 2018 | 72° | 54° | 63° | — | — |
| 2017 | 76° | 51° | 63° | — | — |
| 2016 | 58° | 52° | 55° | 0.51" | — |
| 2015 | 79° | 55° | 67° | — | — |
| 2014 | 67° | 54° | 60° | — | — |
| 2013 | 60° | 47° | 53° | 1.12" | — |
| 2012 | 63° | 51° | 57° | 1.22" | — |
| 2011 | 55° | 49° | 52° | 0.25" | — |
| 2010coldest | 54° | 45° | 49° | 0.08" | — |
| 2009 | 66° | 45° | 55° | — | — |
| 2008 | 56° | 48° | 52° | 1.35" | — |
| 2007 | 60° | 46° | 53° | 1.14" | — |
| 2006 | 70° | 50° | 60° | 0.33" | — |
| 2005 | 63° | 45° | 54° | 0.58" | — |
| 2004 | 63° | 53° | 58° | — | — |
| 2003 | 67° | 53° | 60° | — | — |
| 2002 | 62° | 51° | 57° | 0.25" | — |
| 2001 | 76° | 46° | 61° | — | — |
| 2000 | 70° | 56° | 63° | 0.33" | — |
| 1999 | 65° | 49° | 57° | — | — |
| 1998 | 63° | 52° | 57° | 0.05" | — |
| 1997 | 67° | 49° | 58° | — | — |
| 1996 | 58° | 44° | 51° | 0.2" | — |
| 1995 | 75° | 50° | 63° | — | — |
| 1994 | 66° | 52° | 59° | — | — |
| 1993 | 63° | 52° | 57° | 0.3" | — |
| 1992 | 68° | 40° | 54° | — | — |
| 1991 | 63° | 50° | 56° | — | — |
| 1990 | 67° | 47° | 57° | 0.2" | — |
| 1989 | 64° | 39° | 52° | — | — |
| 1988warmest | 85° | 49° | 67° | — | — |
| 1987 | 71° | 40° | 55° | — | — |
| 1986 | 60° | 44° | 52° | 0.03" | — |
| 1985 | 70° | 42° | 56° | — | — |
| 1984 | 64° | 39° | 52° | — | — |
| 1983 | 67° | 53° | 60° | — | — |
| 1982 | 74° | 43° | 58° | — | — |
| 1981 | 60° | 47° | 53° | 0.03" | — |
| 1980 | 59° | 47° | 53° | 0.53" | — |
| 1979 | 76° | 45° | 60° | — | — |
| 1978 | 84° | 46° | 65° | — | — |
| 1977 | 67° | 48° | 57° | 0.13" | — |
| 1976 | 71° | 42° | 57° | — | — |
| 1975 | 67° | 38° | 52° | — | — |
| 1974 | 68° | 39° | 54° | — | — |
| 1973 | 68° | 37° | 53° | — | — |
| 1972 | 77° | 53° | 65° | 0.18" | — |
| 1971 | 68° | — | — | — | — |
55 years of data from RENTON MUNI AP