Weather on March 18
Seattle, WA
55 Years of Data
Avg High
56°F
Avg Low
40°F
Warmest
2019
57°F avg
Coldest
2012
37°F avg
About This Date
March 18th in Seattle, WA typically brings cool spring weather, with average highs around 56°F and lows near 40°F. Over 56 years of records, the warmest March 18th was in 2019 (57°F average), while the coldest was 2012 (37°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 52% of March 18th dates historically, with the wettest March 18th recording 5.33" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for March 18th 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 | 59° | 51° | 55° | 0.25" | — |
| 2025 | 51° | 33° | 42° | — | — |
| 2024 | 65° | 45° | 55° | — | — |
| 2023 | 65° | 38° | 51° | — | — |
| 2022 | 56° | 43° | 49° | 0.3" | — |
| 2021 | 54° | 38° | 46° | 0.3" | — |
| 2020 | 58° | 32° | 45° | — | — |
| 2019warmest | 75° | 40° | 57° | — | — |
| 2018 | 55° | 38° | 46° | — | — |
| 2017 | 57° | 36° | 46° | 1.19" | — |
| 2016 | 63° | 41° | 52° | — | — |
| 2015 | 63° | 46° | 54° | — | — |
| 2014 | 52° | 41° | 46° | 0.03" | — |
| 2013 | 54° | 40° | 47° | — | — |
| 2012coldest | 42° | 32° | 37° | 0.2" | — |
| 2011 | 52° | 38° | 45° | 0.46" | — |
| 2010 | 53° | 34° | 43° | — | — |
| 2009 | 54° | 39° | 46° | — | — |
| 2008 | 51° | 39° | 45° | — | — |
| 2007 | 61° | 50° | 55° | 0.03" | — |
| 2006 | 49° | 39° | 44° | 0.43" | — |
| 2005 | 52° | 38° | 45° | — | — |
| 2004 | 53° | 39° | 46° | 0.23" | — |
| 2003 | 54° | 39° | 46° | 0.3" | — |
| 2002 | 43° | 35° | 39° | 0.43" | — |
| 2001 | 55° | 47° | 51° | 1.14" | — |
| 2000 | 51° | 42° | 47° | 0.46" | — |
| 1999 | 52° | 42° | 47° | 0.1" | — |
| 1998 | 62° | 39° | 51° | — | — |
| 1997 | 56° | 46° | 51° | 5.33" | — |
| 1996 | 71° | 37° | 54° | — | — |
| 1995 | 57° | 48° | 53° | 0.69" | — |
| 1994 | 51° | 40° | 45° | 0.23" | — |
| 1993 | 50° | 42° | 46° | 0.2" | — |
| 1992 | 57° | 39° | 48° | — | — |
| 1991 | 56° | 36° | 46° | 0.71" | — |
| 1990 | 59° | 42° | 51° | — | — |
| 1989 | 50° | 42° | 46° | 1.02" | — |
| 1988 | 68° | 37° | 53° | — | — |
| 1987 | 52° | 43° | 47° | 0.43" | — |
| 1986 | 57° | 45° | 51° | 0.33" | — |
| 1985 | 50° | 46° | 48° | — | — |
| 1984 | 56° | 45° | 50° | 0.05" | — |
| 1983 | 62° | 38° | 50° | — | — |
| 1982 | 54° | 34° | 44° | — | — |
| 1981 | 65° | 37° | 51° | — | — |
| 1980 | 50° | 39° | 45° | 0.03" | — |
| 1979 | 58° | 42° | 50° | — | — |
| 1978 | 64° | 40° | 52° | — | — |
| 1977 | 54° | 43° | 48° | — | — |
| 1976 | 53° | 42° | 48° | 0.33" | — |
| 1975 | 50° | 42° | 46° | 0.33" | — |
| 1974 | 54° | 35° | 44° | — | — |
| 1973 | 54° | 36° | 45° | 1.02" | — |
| 1972 | 56° | 47° | 51° | 0.05" | — |
| 1971 | 52° | 33° | 42° | — | — |
56 years of data from SEATTLE URBAN SITE