March weather in Mercer Island, WA
The average temperature in Mercer Island in March is 47.1°F (39.4°F–54.8°F). Average precipitation: 3.94 inches.
March is a spring month in Mercer Island, and is cooler than the annual average of 53.8°F. Daily temperatures swing about 15.4°F between overnight low and afternoon high. Expect about 18 days with precipitation. Daylight averages about 11h 39m. For travel, March is cool.
Avg High
54.8°F
Avg Low
39.4°F
Precipitation
3.94 in
Daylight
11h 39m
March records in Mercer Island
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| March 1 | 63.0°F (2025) | 27.0°F (2002) | 0.71 in (2016) |
| March 2 | 61.0°F (1965) | 26.1°F (1951) | 0.70 in (2014) |
| March 3 | 69.1°F (1965) | 25.0°F (1955) | 1.59 in (1950) |
| March 4 | 66.9°F (1965) | 16.0°F (1955) | 0.84 in (1962) |
| March 5 | 64.0°F (2016) | 17.1°F (1955) | 1.44 in (2014) |
| March 6 | 68.0°F (2007) | 27.1°F (2009) | 0.61 in (2013) |
| March 7 | 66.9°F (2001) | 27.1°F (2012) | 0.78 in (1956) |
| March 8 | 69.1°F (2005) | 29.1°F (2021) | 1.12 in (2014) |
| March 9 | 62.1°F (1965) | 27.1°F (2019) | 1.49 in (2011) |
| March 10 | 66.0°F (1965) | 25.0°F (1956) | 0.47 in (2012) |
| March 11 | 66.9°F (1965) | 25.0°F (1956) | 0.83 in (2002) |
| March 12 | 73.0°F (2018) | 26.1°F (1954) | 1.16 in (2003) |
| March 13 | 66.9°F (2015) | 29.1°F (2009) | 0.79 in (1961) |
| March 14 | 63.0°F (1961) | 30.9°F (1953) | 0.63 in (2015) |
| March 15 | 63.0°F (2010) | 30.0°F (1955) | 2.45 in (2015) |
| March 16 | 73.9°F (2024) | 30.0°F (1956) | 1.08 in (2014) |
| March 17 | 71.1°F (2024) | 28.0°F (1955) | 0.94 in (1950) |
| March 18 | 75.0°F (2019) | 30.0°F (1965) | 0.75 in (1950) |
| March 19 | 79.0°F (2019) | 26.1°F (1965) | 0.80 in (1949) |
| March 20 | 72.0°F (2000) | 27.0°F (1955) | 0.59 in (2013) |
| March 21 | 68.0°F (2004) | 30.0°F (1954) | 2.32 in (1948) |
| March 22 | 66.0°F (2019) | 30.0°F (1952) | 0.64 in (2003) |
| March 23 | 66.0°F (1953) | 30.9°F (1954) | 0.82 in (2008) |
| March 24 | 70.0°F (2010) | 28.9°F (1965) | 0.79 in (2026) |
| March 25 | 72.0°F (2025) | 32.0°F (2008) | 0.65 in (2004) |
| March 26 | 72.0°F (2015) | 31.1°F (2009) | 1.42 in (2005) |
| March 27 | 70.0°F (1948) | 32.0°F (2023) | 0.65 in (2005) |
| March 28 | 64.0°F (1964) | 28.9°F (1954) | 0.70 in (2010) |
| March 29 | 79.0°F (2004) | 28.0°F (1954) | 1.15 in (2012) |
| March 30 | 68.0°F (2016) | 28.9°F (1954) | 0.40 in (2020) |
| March 31 | 73.0°F (2016) | 30.0°F (1949) | 0.65 in (1959) |