Weather on March 21
Seattle, WA
55 Years of Data
Avg High
55°F
Avg Low
41°F
Warmest
2004
55°F avg
Coldest
1994
39°F avg
About This Date
March 21st in Seattle, WA typically brings cool spring weather, with average highs around 55°F and lows near 41°F. Over 56 years of records, the warmest March 21st was in 2004 (55°F average), while the coldest was 1994 (39°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 55% of March 21st dates historically, with the wettest March 21st recording 1.6" 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 March 21st in Seattle, WA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 53° | 41° | 47° | — | — |
| 2025 | 53° | 41° | 47° | 0.64" | — |
| 2024 | 59° | 47° | 53° | 0.25" | — |
| 2023 | 56° | 44° | 50° | — | — |
| 2022 | 51° | 42° | 47° | 0.25" | — |
| 2021 | 45° | 40° | 42° | — | — |
| 2020 | 55° | 38° | 46° | — | — |
| 2019 | 61° | 45° | 53° | — | — |
| 2018 | 59° | 34° | 46° | 0.36" | — |
| 2017 | 57° | 46° | 52° | 0.43" | — |
| 2016 | 56° | 47° | 51° | 0.71" | — |
| 2015 | 59° | 49° | 54° | 0.36" | — |
| 2014 | 52° | 39° | 45° | — | — |
| 2013 | 50° | 36° | 43° | 0.25" | — |
| 2012 | 49° | 36° | 42° | 0.1" | — |
| 2011 | 53° | 42° | 48° | 0.03" | — |
| 2010 | 57° | 48° | 53° | 0.08" | — |
| 2009 | 51° | 31° | 41° | — | — |
| 2008 | 49° | 38° | 43° | — | — |
| 2007 | 50° | 32° | 41° | — | — |
| 2006 | 52° | 46° | 49° | 0.18" | — |
| 2005 | 50° | 35° | 43° | 0.28" | — |
| 2004warmest | 68° | 41° | 55° | — | — |
| 2003 | 53° | 45° | 49° | 1.6" | — |
| 2002 | 53° | 36° | 44° | — | — |
| 2001 | 53° | 40° | 46° | — | — |
| 2000 | 57° | 43° | 50° | 0.03" | — |
| 1999 | 59° | 47° | 53° | 0.43" | — |
| 1998 | 54° | 44° | 49° | 0.46" | — |
| 1997 | 57° | 35° | 46° | — | — |
| 1996 | 59° | 42° | 51° | 0.15" | — |
| 1995 | 49° | 36° | 42° | 0.08" | — |
| 1994coldest | 45° | 34° | 39° | 0.89" | — |
| 1993 | 61° | 47° | 54° | 0.1" | — |
| 1992 | 66° | 40° | 53° | — | — |
| 1991 | 54° | 38° | 46° | — | — |
| 1990 | 58° | 41° | 49° | — | — |
| 1989 | 52° | 44° | 48° | 0.18" | — |
| 1988 | 54° | 43° | 48° | 0.03" | — |
| 1987 | 60° | 37° | 49° | — | — |
| 1986 | 55° | 45° | 50° | 0.84" | — |
| 1985 | 58° | 36° | 47° | 0.48" | — |
| 1984 | 55° | 46° | 51° | 0.03" | — |
| 1983 | 59° | 46° | 53° | 0.2" | — |
| 1982 | 56° | 34° | 45° | — | — |
| 1981 | 64° | 43° | 53° | 0.15" | — |
| 1980 | 54° | 41° | 47° | — | — |
| 1979 | 61° | 36° | 48° | — | — |
| 1978 | 62° | 44° | 53° | — | — |
| 1977 | 55° | 46° | 51° | — | — |
| 1976 | 58° | 41° | 49° | 0.08" | — |
| 1975 | 49° | 37° | 43° | 0.58" | — |
| 1974 | 57° | 34° | 45° | — | — |
| 1973 | 54° | 40° | 47° | — | — |
| 1972 | 52° | 46° | 49° | 0.69" | — |
| 1971 | 51° | 36° | 43° | — | — |
56 years of data from SEATTLE URBAN SITE