Water temperature in Seattle (WA) in April
Is it warm enough to swim in Seattle in April? Average water temperature in Seattle in April is 48.6°F and therefore is not suitable for comfortable swimming. The warmest sea in Seattle in April is 55.2°F, and the coldest is 45.3°F. Average high air temperature in Seattle in April is 59°F, and average low temperature is 42°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Seattle
Changes water temperature in Seattle in April 2025, 2024
To get an accurate forecast for the water temperature in Seattle for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Seattle, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of April.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| April 1 | 47.5°F | 49.1°F | 45.5°F | 51.6°F |
| April 2 | 47.5°F | 50.5°F | 45.5°F | 52°F |
| April 3 | 48.4°F | 50.2°F | 45.3°F | 51.6°F |
| April 4 | 48°F | 49.8°F | 45.3°F | 51.3°F |
| April 5 | 48.2°F | 49.6°F | 45.3°F | 50.7°F |
| April 6 | 48.2°F | 49.6°F | 45.5°F | 50.5°F |
| April 7 | 48.9°F | 49.6°F | 45.3°F | 51.3°F |
| April 8 | 48.4°F | 49.6°F | 45.7°F | 50.9°F |
| April 9 | 48°F | 49.3°F | 45.5°F | 51.4°F |
| April 10 | 48.7°F | 49.1°F | 45.5°F | 52°F |
| April 11 | 48.6°F | 49.1°F | 45.5°F | 52°F |
| April 12 | 49.1°F | 48.9°F | 45.3°F | 51.8°F |
| April 13 | 49.8°F | 49.5°F | 45.3°F | 51.3°F |
| April 14 | 50.2°F | 48.9°F | 45.5°F | 51.1°F |
| April 15 | 51.1°F | 48.9°F | 45.7°F | 51.1°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| April 16 | 50.5°F | 49.6°F | 45.7°F | 51.6°F |
| April 17 | 50°F | 49.5°F | 45.9°F | 51.8°F |
| April 18 | 50.7°F | 50.2°F | 46.6°F | 53.1°F |
| April 19 | 50.4°F | 50.4°F | 46.4°F | 53.4°F |
| April 20 | 50.2°F | 51.6°F | 46.4°F | 54.1°F |
| April 21 | 50.7°F | 50.5°F | 46.2°F | 54.5°F |
| April 22 | 51.1°F | 50.4°F | 46.4°F | 55.2°F |
| April 23 | 51.8°F | 51.1°F | 46.4°F | 54.5°F |
| April 24 | 51.1°F | 50.7°F | 46.2°F | 54.1°F |
| April 25 | 51.4°F | 50.5°F | 46.2°F | 53.8°F |
| April 26 | 52°F | 50.4°F | 46.6°F | 53.6°F |
| April 27 | 52°F | 50.7°F | 46.8°F | 53.4°F |
| April 28 | 51.3°F | 50.4°F | 47.3°F | 53.4°F |
| April 29 | 51.3°F | 50.4°F | 47.7°F | 53.4°F |
| April 30 | 50.5°F | 50.7°F | 47.8°F | 53.6°F |
Average water temperature in Seattle in April over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 52.5°F | 48.6°F | 48.9°F | 49.5°F | 49.5°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 49.8°F | 48.4°F | 47.8°F | 50°F | 49.8°F |
Seattle sea state in April
Chart comparing the height of waves in Seattle in April over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Weather and climate in Seattle in April
This data display average monthly climate indicators in Seattle in April based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature59°F
- Average LOW temperature42°F
- Average humidity
71 - Average rainfall days14 days
- Average rainfall69mm/2.7''
- Average daylight14h
- Average sunshine6.9h
- Average UV index5
Seattle water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
