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 9.83°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.

49.7

°F

December 21, 09:50

Trend:

decreasing

Yesterday:

49.9°F

Tomorrow:

49.6°F

Sunrise:

07:55

Sunset:

16:21

Day Length:

8 h. 26 min.

Seattle in December

Minimum:

45.8°F

Average:

47.1°F

Maximum:

48.9°F

Sea water temperature in Seattle today

As of now, in Seattle, the water temperature is 49.7°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 0.7°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 fall a bit.

Recent sea temperature and forecast

Today's water temperature slightly varies from the average of the past two weeks. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 50.1°F on 2018, while the historical minimum was 48.1°F on 2022.

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. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 49.0°F, the minimum temperature may reach 48.7°F, and the maximum might stay at 49.6°F.

Daily water temperature in Seattle

Date	Current Year actual* / forecast**	last year	10 years average
Dec 7	50.1°F	50.0°F	49.4°F
Dec 8	50.3°F	49.7°F	49.2°F
Dec 9	49.9°F	49.9°F	49.2°F
Dec 10	49.6°F	49.6°F	49.0°F
Dec 11	50.4°F	50.4°F	49.0°F
Dec 12	50.2°F	49.9°F	49.0°F
Dec 13	49.6°F	49.4°F	49.2°F
Dec 14	49.2°F	49.7°F	49.1°F
Dec 15	49.2°F	49.5°F	49.0°F
Dec 16	49.4°F	49.3°F	49.1°F
Dec 17	49.2°F	48.7°F	48.9°F
Dec 18	49.1°F	48.9°F	49.0°F
Dec 19	50.2°F	48.8°F	49.1°F
Dec 20	49.9°F	48.7°F	49.0°F
Dec 21	49.7°F	49.4°F	49.0°F
Dec 22	49.6°F	49.2°F	48.8°F
Dec 23	49.4°F	48.9°F	48.7°F
Dec 24	49.2°F	49.5°F	48.5°F
Dec 25	49.0°F	48.5°F	48.3°F
Dec 26	48.8°F	48.3°F	48.1°F
Dec 27	48.8°F	49.3°F	48.1°F
Dec 28	48.7°F	49.0°F	48.0°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 February 5, 2014, dipping to 44.4°F. The average readings by season are 47.6°F in Winter, 49.6°F in Spring, 57.1°F in Summer, and 54.3°F in Autumn.