Seattle weather in April
In April, Seattle has daytime highs averaging 14 °C, nights around 5.2 °C, with 16 wet days. Figures are 1991–2020 climate normals.
- 14.2°C Average high
- 5.2°C Average low
- 16days Wet days
- 111mm Rainfall
- 14h Daylight
Daily temperatures through April
How April develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 April | 13.0 °C | 4.3 °C | 54 % |
| 11–20 April | 14.2 °C | 5.1 °C | 54 % |
| 21–30 April | 15.4 °C | 6.1 °C | 49 % |
- Average highs rise from 13.0 °C early in April to 15.4 °C by the end of it.
- Rain is most likely over days 1–10 of April (54 % of days) and least likely over days 21–30 (49 %).
What to expect
| Measure | Typical April | Share of the month |
|---|---|---|
| Days above 25 °C | 0.07 of 30 | 0 % |
| Days above 30 °C | 0 of 30 | 0 % |
| Days below 0 °C | 0.6 of 30 | 2 % |
| Days with more than 1 mm rain | 16 of 30 | 52 % |
Conditions in April
| Measure | Average |
|---|---|
| Mean temperature | 9.0 °C |
| Record high (1991–2020) | 28 °C |
| Record low (1991–2020) | -2.2 °C |
| Relative humidity | 78 % |
| Wind speed | 15 km/h |
| Cloud cover | 69 % |
Where Seattle ranks in April
| Ranking | Position | Value |
|---|---|---|
| The coolest places in North America in April | 42ndof 50 | 14 °C |
April compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| February | 9.1 °C | 119 mm | 70 % |
| March | 11.4 °C | 136 mm | 72 % |
| April | 14.2 °C | 111 mm | 69 % |
| May | 17.9 °C | 76 mm | 65 % |
| June | 20.6 °C | 59 mm | 62 % |
See all twelve months for Seattle
- April is the 7th warmest month here.
- It is the 6th driest month of the year.
- It ranks 7th for least cloud cover.
- Days last about 14 hours from sunrise to sunset.
- It rains on 16 of 30 days — 52 % of the month.
- Nights are about 9.1 °C cooler than the middle of the day.
- The hottest April day on record since 1991 reached 28 °C, 13 °C above the usual daytime high.
Nearby destinations in April
QuestionsApril in Seattle, answered
How warm is Seattle in April?
Daily highs average 14 °C and nights fall to about 5.2 °C, a spread of 9.1 °C between afternoon and dawn. That makes April the 7th warmest month of the year here.
Does it rain much in Seattle in April?
April averages 111 mm of rain, spread over about 16 of the 30 days — 52 % of the month. Cloud cover averages 69 % of the sky.
How long are the days in April?
Seattle averages 14 hours between sunrise and sunset in April. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.