March weather in SeaTac, WA
The average temperature in SeaTac in March is 47.1°F (39.9°F–54.2°F). Average precipitation: 4.17 inches. Average snowfall is 0.4 inches.
March is a spring month in SeaTac, and is cooler than the annual average of 53.7°F. Daily temperatures swing about 14.3°F between overnight low and afternoon high. Expect about 17 days with precipitation. Daylight averages about 11h 39m. For travel, March is cool.
Avg High
54.2°F
Avg Low
39.9°F
Precipitation
4.17 in
Snow
0.4 in
March records in SeaTac
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| March 1 | 62.1°F (1968) | 23.0°F (1971) | 0.84 in (1975) |
| March 2 | 64.0°F (1965) | 21.9°F (1989) | 1.16 in (1987) |
| March 3 | 69.1°F (1965) | 19.9°F (1989) | 2.08 in (1950) |
| March 4 | 68.0°F (1965) | 10.9°F (1955) | 0.92 in (1979) |
| March 5 | 66.0°F (1965) | 12.9°F (1955) | 2.70 in (1972) |
| March 6 | 68.0°F (2007) | 26.1°F (1951) | 1.18 in (1970) |
| March 7 | 66.0°F (2001) | 26.1°F (1951) | 0.75 in (2017) |
| March 8 | 66.9°F (2005) | 28.0°F (1951) | 1.27 in (2014) |
| March 9 | 66.9°F (1981) | 28.0°F (1951) | 1.47 in (2011) |
| March 10 | 68.0°F (1979) | 19.9°F (1956) | 0.87 in (1971) |
| March 11 | 64.9°F (1965) | 23.0°F (1956) | 1.15 in (2026) |
| March 12 | 73.0°F (2018) | 25.0°F (1954) | 0.99 in (2003) |
| March 13 | 70.0°F (1979) | 28.0°F (1954) | 1.22 in (2026) |
| March 14 | 64.0°F (1996) | 26.1°F (1953) | 0.76 in (1984) |
| March 15 | 64.9°F (2010) | 30.0°F (1955) | 2.20 in (2015) |
| March 16 | 73.9°F (2024) | 28.9°F (1952) | 1.09 in (2014) |
| March 17 | 71.1°F (2024) | 27.0°F (1951) | 1.05 in (1950) |
| March 18 | 75.9°F (2019) | 28.9°F (1954) | 1.86 in (1997) |
| March 19 | 79.0°F (2019) | 27.0°F (1965) | 1.27 in (1997) |
| March 20 | 79.0°F (2019) | 26.1°F (1955) | 0.76 in (1984) |
| March 21 | 69.1°F (1992) | 28.9°F (1952) | 2.04 in (1948) |
| March 22 | 68.0°F (1979) | 28.0°F (1952) | 1.81 in (1993) |
| March 23 | 68.0°F (1979) | 28.0°F (1954) | 0.94 in (1971) |
| March 24 | 68.0°F (2010) | 30.0°F (1965) | 0.99 in (2026) |
| March 25 | 73.0°F (2025) | 30.9°F (1954) | 0.62 in (2010) |
| March 26 | 70.0°F (1969) | 32.0°F (1975) | 1.51 in (2005) |
| March 27 | 71.1°F (1994) | 26.1°F (1975) | 0.64 in (1968) |
| March 28 | 73.0°F (1994) | 26.1°F (1954) | 0.87 in (2014) |
| March 29 | 78.1°F (2004) | 24.1°F (1954) | 1.08 in (2012) |
| March 30 | 72.0°F (1995) | 27.0°F (1954) | 0.65 in (1963) |
| March 31 | 75.0°F (1987) | 30.0°F (1949) | 0.57 in (1959) |