Weather on May 21
Seattle, WA
55 Years of Data
Avg High
65°F
Avg Low
49°F
Warmest
2015
69°F avg
Coldest
1996
48°F avg
About This Date
May 21st in Seattle, WA typically brings mild spring weather, with average highs around 65°F and lows near 49°F. Over 55 years of records, the warmest May 21st was in 2015 (69°F average), while the coldest was 1996 (48°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 21st dates historically, with the wettest May 21st recording 1.3" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 21st in Seattle, WA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 50° | 56° | — | — |
| 2024 | 54° | 49° | 51° | 1.22" | — |
| 2023 | 62° | 52° | 57° | — | — |
| 2022 | 66° | 44° | 55° | — | — |
| 2021 | 63° | 46° | 54° | — | — |
| 2020 | 58° | 47° | 52° | 0.43" | — |
| 2019 | 62° | 51° | 57° | — | — |
| 2018 | 70° | 54° | 62° | — | — |
| 2017 | 75° | 53° | 64° | — | — |
| 2016 | 59° | 52° | 55° | 0.1" | — |
| 2015warmest | 81° | 58° | 69° | — | — |
| 2014 | 69° | 55° | 62° | — | — |
| 2013 | 61° | 48° | 54° | 1.09" | — |
| 2012 | 63° | 51° | 57° | 1.04" | — |
| 2011 | 56° | 50° | 53° | 0.25" | — |
| 2010 | 57° | 47° | 52° | 0.1" | — |
| 2009 | 65° | 45° | 55° | — | — |
| 2008 | 61° | 48° | 54° | 0.3" | — |
| 2007 | 59° | 45° | 52° | 1.3" | — |
| 2006 | 69° | 50° | 60° | 0.1" | — |
| 2005 | 63° | 46° | 54° | 0.58" | — |
| 2004 | 63° | 53° | 58° | — | — |
| 2003 | 69° | 53° | 61° | — | — |
| 2002 | 62° | 50° | 56° | 0.51" | — |
| 2001 | 74° | 50° | 62° | — | — |
| 2000 | 69° | 56° | 62° | 0.28" | — |
| 1999 | 64° | 47° | 55° | — | — |
| 1998 | 57° | 50° | 54° | — | — |
| 1997 | 66° | 50° | 58° | — | — |
| 1996coldest | 52° | 44° | 48° | 0.25" | — |
| 1995 | 74° | 51° | 62° | — | — |
| 1994 | 70° | 52° | 61° | — | — |
| 1993 | 64° | 55° | 60° | — | — |
| 1992 | 65° | 44° | 54° | — | — |
| 1991 | 62° | 52° | 57° | — | — |
| 1990 | 71° | 47° | 59° | 0.53" | — |
| 1989 | 61° | 44° | 52° | — | — |
| 1988 | 83° | 49° | 66° | — | — |
| 1987 | 74° | 49° | 61° | — | — |
| 1986 | 59° | 45° | 52° | 0.74" | — |
| 1985 | 73° | 47° | 60° | — | — |
| 1984 | 60° | 46° | 53° | — | — |
| 1983 | 70° | 53° | 61° | — | — |
| 1982 | 72° | 50° | 61° | — | — |
| 1981 | 59° | 51° | 55° | — | — |
| 1980 | 61° | 48° | 54° | 0.56" | — |
| 1979 | 73° | 49° | 61° | — | — |
| 1978 | 60° | 47° | 53° | — | — |
| 1977 | 62° | 49° | 55° | — | — |
| 1976 | 69° | 46° | 58° | — | — |
| 1975 | 60° | 46° | 53° | 0.03" | — |
| 1974 | 67° | 45° | 56° | — | — |
| 1973 | 69° | 45° | 57° | — | — |
| 1972 | 59° | 53° | 56° | — | — |
| 1971 | 68° | 44° | 56° | — | — |
55 years of data from SEATTLE URBAN SITE