Seattle water temp
This data the coastal Seattle ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in Seattle
Water temperature in Seattle today is 56.8°F. Based on our historical data over a period of ten years, the warmest water in this day in the Pacific Ocean near Seattle was recorded in 2021 and was 56.7°F, and the coldest was recorded in 2007 at 52.5°F. Sea water temperature in Seattle is expected to drop to 54.1°F in the next 10 days. September average water temperature in Seattle is 55.9°F, the minimum temperature is 51.4°F, and the maximum is 60.4°F.
Throughout the year, the water temperature in Seattle does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Seattle in winter reaches 46.4°F, in spring 49.1°F, in summer the average temperature rises to 56.5°F, and in autumn it is 53.1°F.
Seattle water temperature now
| September 26, 2025 |
|---|
| today temp |
| 56.8°F |
| September 25, 2025 |
|---|
| yesterday temp |
| 57.2°F |
The ocean salinity in Seattle is 31.61‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Seattle for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Seattle. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Seattle. Data in table shown for September 26, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 0' 3" | 0' 2" | 0' 2" | 0' 1" |
| 0.07 m | 0.06 m | 0.04 m | 0.03 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 0' 1" | 0' 1" | 0' 1" | 0' 2" |
| 0.03 m | 0.03 m | 0.03 m | 0.05 m |
Surf report in Seattle
Seattle weather forecast
Current temperature and weather
Data in a table show Seattle temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Seattle.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 52.3°F | 52.5°F | 50.2°F | 53.8°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 |  | | |
| 60.4°F | 65.5°F | 66.9°F | 65.1°F |
You may also be interested in other sections of our site for Seattle: Sunrise and Sunset, Tides
Seattle water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Seattle. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Seattle on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 46.2°F | 43.2°F | 49.1°F | cold |
| Ocean water temperature in Seattle in January | ||||
| February | 45.7°F | 43.5°F | 48.2°F | cold |
| Ocean water temperature in Seattle in February | ||||
| March | 46.6°F | 44.2°F | 50.4°F | cold |
| Ocean water temperature in Seattle in March | ||||
| April | 48.6°F | 45.3°F | 55.2°F | cold |
| Ocean water temperature in Seattle in April | ||||
| May | 52°F | 48°F | 57.6°F | cold |
| Ocean water temperature in Seattle in May | ||||
| June | 54.7°F | 50.2°F | 61.5°F | cold |
| Ocean water temperature in Seattle in June | ||||
| July | 57.4°F | 52.5°F | 64°F | cold |
| Ocean water temperature in Seattle in July | ||||
| August | 57.6°F | 54.1°F | 63.7°F | cold |
| Ocean water temperature in Seattle in August | ||||
| September | 55.9°F | 51.4°F | 60.4°F | cold |
| Ocean water temperature in Seattle in September | ||||
| October | 53.1°F | 48.6°F | 56.7°F | cold |
| Ocean water temperature in Seattle in October | ||||
| November | 50°F | 46.4°F | 54°F | cold |
| Ocean water temperature in Seattle in November | ||||
| December | 47.5°F | 44.2°F | 50.5°F | cold |
| Ocean water temperature in Seattle in December | ||||
Chart monthly average water temperature in Seattle
