Seattle weather in March
Temperature, sea and sunshine in March: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in March
Poor
Best time to visit: July – September
What is the weather like in Seattle in March?
In March, Seattle is cool: daytime highs average 11 °C, and nights cool down to about 3 °C. The sea averages 8.2 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. It rains often – on about 18 days, adding up to 141 mm. All in all, March is not an ideal month for a holiday in Seattle.
March compared
How the weather changes from February to April. Tap a month to open it.
| FebruaryFeb | MarchMar | AprilApr | |
|---|---|---|---|
| Score | 8 | 17 | 43 |
| Day | 8° | 11° | 13° |
| Night | 1° | 3° | 5° |
| Sea | 8° | 8° | 9° |
| Sun | 4 h | 4 h | 6 h |
| Rain days | 16 | 18 | 15 |
More details for March
- Daylight
- 11 h 49 min07:25 – 19:13
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 74 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 1 day1 cm or more of fresh snowAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %26 %
- Sunshineweight 20 %22 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in March
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Seattle in March: quick answers
Is Seattle hot in March?
No. In March, Seattle is cool: daytime highs average 11 °C and nights drop to about 3 °C.
Can you swim in Seattle in March?
Only if you don't mind cold water: in March the sea averages just 8.2 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Seattle in March?
It rains often – on about 18 days, adding up to 141 mm.
Seattle month by month
The whole year in SeattleAll destinations: USAWhere to go in MarchSea temperature in March
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences