What is the current water temperature in Seattle?

Q: What is the current water temperature in Seattle?

As of now, in Seattle, the water temperature is 9.65°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

United States > Seattle

Water temperature in Seattle

Detailed information about the current water temperature in Seattle. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.

49.4

°F

April 18, 08:26

Trend:

stable

Yesterday:

49.6°F

Tomorrow:

49.6°F

Sunrise:

06:15

Sunset:

20:03

Day Length:

13 h. 48 min.

Seattle in April

Minimum:

45.9°F

Average:

47.3°F

Maximum:

48.7°F

Sea water temperature in Seattle today

As of now, in Seattle, the water temperature is 49.4°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 0.5°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 51.7°F on 2016, while the historical minimum was 46.9°F on 2023.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 50.1°F, with minimum temperature starting at 49.6°F, while the maximum might reach 50.4°F.

Daily water temperature in Seattle

Date	Current Year actual* / forecast**	last year	10 years average
Apr 4	48.7°F	49.3°F	47.9°F
Apr 5	49.6°F	49.2°F	48.0°F
Apr 6	48.9°F	50.3°F	47.8°F
Apr 7	49.3°F	50.1°F	48.1°F
Apr 8	50.0°F	52.4°F	48.6°F
Apr 9	50.4°F	50.8°F	48.6°F
Apr 10	50.5°F	50.1°F	48.7°F
Apr 11	50.9°F	51.6°F	49.2°F
Apr 12	50.6°F	49.6°F	48.9°F
Apr 13	50.6°F	49.2°F	48.7°F
Apr 14	50.3°F	49.2°F	48.7°F
Apr 15	49.8°F	49.8°F	48.7°F
Apr 16	49.6°F	49.9°F	48.8°F
Apr 17	49.6°F	50.2°F	48.9°F
Apr 18	49.4°F	50.2°F	48.9°F
Apr 19	49.6°F	50.5°F	49.2°F
Apr 20	49.9°F	50.4°F	49.4°F
Apr 21	50.1°F	50.1°F	49.6°F
Apr 22	50.2°F	50.4°F	49.7°F
Apr 23	50.4°F	50.9°F	50.0°F
Apr 24	50.3°F	50.8°F	49.9°F
Apr 25	50.3°F	50.6°F	49.9°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Seattle by month

In an average year, Seattle offers no days when the water temperature is warm enough to swim comfortably.

The warmest water in Seattle was recorded on July 6, 2021, reaching a 63.4°F. While the coldest temperature occurred on January 29, 2022, dipping to 44.4°F. The average readings by season are 47.9°F in Winter, 49.6°F in Spring, 57.0°F in Summer, and 54.4°F in Autumn.