Climate averages 1991–2020
Seattle weather
in March.
A cool, wet month: the 8th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a cool month in Seattle: daytime highs average 10.8°C and nights cool to about 2.9°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 139 mm of rain on roughly 18 days, which makes March a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 52 min on an average March day.
The nearest other city in this atlas is Bellevue (10 km away). In March its highs average 11.0°C, about as warm as Seattle, with 139 mm of rain.
Among the 498 cities listed in the United States, Seattle ranks joint 335th of 498 for the warmest March highs and joint 478th of 498 for the driest March (rainfall, lowest first). The mean March high of those 498 cities is 14.9°C; Seattle is 4.1°C cooler than that mean.
From March to April, average highs rise by 2.6°C to 13.4°C, and monthly rainfall falls from 139 mm to 113 mm.
The annual picture
March in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Seattle climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.2°C1.6°C | 1.6°C | 176 | 18.4 | 8.99 h |
| February | 8.6°C1.4°C | 1.4°C | 121 | 14.7 | 10.210 h |
| March, selected | 10.8°C2.9°C | 2.9°C | 139 | 17.5 | 11.912 h |
| April | 13.4°C4.8°C | 4.8°C | 113 | 14.9 | 13.614 h |
| May | 17.1°C8.2°C | 8.2°C | 76 | 12.0 | 15.115 h |
| June | 19.7°C11.0°C | 11.0°C | 59 | 9.5 | 15.916 h |
| July | 23.7°C13.6°C | 13.6°C | 25 | 5.0 | 15.616 h |
| August | 24.0°C13.9°C | 13.9°C | 33 | 4.8 | 14.314 h |
| September | 20.6°C11.3°C | 11.3°C | 67 | 8.4 | 12.613 h |
| October | 14.6°C7.4°C | 7.4°C | 134 | 14.1 | 10.911 h |
| November | 9.6°C4.0°C | 4.0°C | 194 | 18.0 | 9.49 h |
| December | 6.6°C1.6°C | 1.6°C | 178 | 17.7 | 8.59 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
March in nearby cities
- Bellevue in MarchUnited States · 10 kmHigh 11.0°C · Low 2.9°C · 139 mm rain
- Kirkland in MarchUnited States · 12 kmHigh 10.6°C · Low 2.8°C · 139 mm rain
- Renton in MarchUnited States · 16 kmHigh 11.2°C · Low 3.0°C · 139 mm rain
- Kent in MarchUnited States · 26 kmHigh 11.3°C · Low 3.0°C · 139 mm rain
- Federal Way in MarchUnited States · 32 kmHigh 10.3°C · Low 2.2°C · 152 mm rain
- Auburn in MarchUnited States · 34 kmHigh 11.0°C · Low 2.7°C · 152 mm rain
- Tacoma in MarchUnited States · 40 kmHigh 10.7°C · Low 2.9°C · 132 mm rain
- Everett in MarchUnited States · 43 kmHigh 10.5°C · Low 3.1°C · 177 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Seattle) is explained once on the Seattle year overview and on the Sources, method and limits page.
Bellevue, Kent and Renton lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.