World sea water temperatures

Water temperature in Seattle (WA) in August

Is it warm enough to swim in Seattle in August? Average water temperature in Seattle in August is 57.6°F and therefore is not suitable for comfortable swimming. The warmest sea in Seattle in August is 63.7°F, and the coldest is 54.1°F. Average high air temperature in Seattle in August is 76°F, and average low temperature is 56°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 August 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 August.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
August 159.2°F58.8°F55°F63.7°F
August 258.3°F59.7°F54.3°F63°F
August 358.5°F59.9°F54.5°F61.3°F
August 457.9°F59.5°F55°F60.6°F
August 557.7°F58.6°F55°F61.5°F
August 657.6°F59.2°F55.2°F61°F
August 758.5°F58.6°F55.4°F61.9°F
August 857.9°F60.1°F55.2°F62.4°F
August 959.7°F60.3°F54.9°F61.9°F
August 1059.5°F61.2°F54.9°F61.7°F
August 1160.3°F61.5°F54.5°F61.5°F
August 1259.9°F59.2°F54.3°F59.9°F
August 1359.9°F58.8°F54.9°F60.4°F
August 1459.4°F60.4°F54.5°F61°F
August 1559°F60.6°F54.5°F61.2°F
Day 2025 2024 Min Max
August 1656.7°F58.8°F54.1°F60.8°F
August 1756.8°F59.2°F54.1°F61.3°F
August 1856.8°F57.7°F54.5°F60.1°F
August 1959°F57.7°F54.7°F62.4°F
August 2057.4°F57.9°F54.7°F61.5°F
August 2158.5°F58.1°F54.9°F61.9°F
August 2258.8°F58.5°F54.7°F61.3°F
August 2359.5°F58.3°F54.5°F60.8°F
August 2459.4°F57.9°F54.3°F60.6°F
August 2559°F58.6°F54.7°F61.2°F
August 2660.1°F57.2°F55°F60.8°F
August 2759.2°F57°F55.2°F59.5°F
August 2860.1°F57.6°F55°F60.1°F
August 2959.9°F57.9°F54.3°F59.9°F
August 3059°F58.3°F54.3°F59.5°F
August 3160.1°F59.5°F54.5°F60.3°F
Seattle water temp chart in August

Average water temperature in Seattle in August over a decade

20162017201820192020
57.7°F58.1°F58.8°F58.6°F58.6°F
20212022202320242025
58.5°F60.4°F58.8°F59°F58.3°F

Seattle sea state in August

Chart comparing the height of waves in Seattle in August 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.

Waves height in Seattle in August

Weather and climate in Seattle in August

This data display average monthly climate indicators in Seattle in August 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 temperature76°F
  • Average LOW temperature56°F
  • Average humidity
    68
  • Average rainfall days5 days
  • Average rainfall23mm/0.9''
  • Average daylight14h
  • Average sunshine9.1h
  • Average UV index6

Seattle water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in August?

Want to know where the water temperature in August is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Whidbey Island57.6°F54.1°F63.7°F
Mutiny Bay57.2°F53.4°F61.9°F
Hansville57.2°F53.8°F61.3°F
Meadowdale57.9°F54°F65.3°F
Freeland57°F53.4°F61°F
Mukilteo58.3°F53.6°F66.2°F
Clinton58.3°F53.6°F66.2°F
Lofall57.7°F54.1°F64.4°F
Kingston57.6°F54.3°F63.1°F
Langley58.1°F52.9°F66°F

Washington photo gallery

  • Mutiny Bay, Robinson Beach, Whidbey Island
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  • Mutiny Bay, Robinson Beach, Whidbey Island

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Seattle is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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