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 14.4°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.

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.

57.9

°F

September 18, 03:29

Trend:

stable

Yesterday:

57.1°F

Tomorrow:

57.8°F

Sunrise:

06:50

Sunset:

19:16

Day Length:

12 h. 26 min.

Seattle in September

Minimum:

45.8°F

Average:

47.5°F

Maximum:

48.4°F

Sea water temperature in Seattle today

As of now, in Seattle, the water temperature is 57.9°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 1.7°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 56.7°F on 2019, while the historical minimum was 55.6°F on 2021.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 57.8°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Seattle

Date	Current Year actual* / forecast**	last year	10 years average
Sep 4	58.7°F	58.6°F	57.8°F
Sep 5	58.8°F	58.2°F	57.4°F
Sep 6	58.4°F	56.8°F	57.1°F
Sep 7	59.1°F	57.6°F	57.4°F
Sep 8	58.0°F	57.7°F	57.3°F
Sep 9	57.9°F	59.2°F	57.4°F
Sep 10	57.7°F	58.6°F	57.3°F
Sep 11	57.3°F	58.0°F	57.4°F
Sep 12	57.2°F	56.9°F	57.0°F
Sep 13	56.7°F	57.5°F	57.1°F
Sep 14	57.3°F	57.3°F	57.1°F
Sep 15	57.1°F	57.0°F	56.9°F
Sep 16	57.4°F	56.0°F	56.6°F
Sep 17	57.1°F	56.7°F	56.6°F
Sep 18	57.9°F	56.3°F	56.2°F
Sep 19	57.8°F	56.7°F	56.1°F
Sep 20	57.5°F	56.1°F	55.9°F
Sep 21	57.7°F	55.7°F	56.0°F
Sep 22	57.8°F	56.1°F	56.1°F
Sep 23	57.7°F	56.1°F	56.0°F
Sep 24	57.8°F	56.8°F	56.1°F
Sep 25	57.9°F	56.5°F	56.2°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 47.8°F in Winter, 49.7°F in Spring, 57.1°F in Summer, and 54.4°F in Autumn.