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Water temperature in Coupeville (WA) in September

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Is it warm enough to swim in Coupeville in September? Average water temperature in Coupeville in September is 54°F and therefore is not suitable for comfortable swimming. The warmest sea in Coupeville in September is 58.3°F, and the coldest is 49.8°F. Average high air temperature in Coupeville in September is 67°F, and average low temperature is 47°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Coupeville

Changes water temperature in Coupeville in September 2025, 2024

To get an accurate forecast for the water temperature in Coupeville for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Coupeville, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 156.1°F55°F50.9°F58.3°F
September 255.9°F55°F50.7°F57.6°F
September 356.3°F54.5°F50.9°F58.1°F
September 455.2°F55.6°F50.9°F57.9°F
September 555.6°F56.3°F51.3°F56.7°F
September 657°F56.7°F51.6°F57.7°F
September 7 57°F51.6°F57°F
September 8 57.7°F51.6°F57.7°F
September 9 57.2°F51.4°F57.2°F
September 10 57.9°F51.4°F57.9°F
September 11 55.4°F51.6°F57.7°F
September 12 54.7°F51.6°F57.4°F
September 13 54.7°F51.4°F57.2°F
September 14 54.9°F51.3°F56.7°F
September 15 54.5°F50.9°F55.9°F
Day 2025 2024 Min Max
September 16 53.8°F50.9°F56.3°F
September 17 53.6°F50.9°F55.6°F
September 18 55°F50.7°F55.4°F
September 19 54.3°F50.9°F55.2°F
September 20 54.3°F50.7°F55°F
September 21 54.1°F50.7°F55.4°F
September 22 52.7°F50.5°F55.4°F
September 23 53.2°F50.7°F54.9°F
September 24 53.6°F50.7°F54.5°F
September 25 52.7°F50.5°F54.9°F
September 26 52.9°F50°F54.9°F
September 27 52.7°F49.8°F55.2°F
September 28 52.9°F49.8°F54.9°F
September 29 52.7°F49.8°F54.9°F
September 30 52.5°F49.8°F54.7°F
Coupeville water temp chart in September

Average water temperature in Coupeville in September over a decade

20152016201720182019
54.7°F55°F54.7°F54.7°F55.6°F
20202021202220232024
54.5°F54.9°F54.7°F54.5°F54.5°F

Coupeville sea state in September

Chart comparing the height of waves in Coupeville in September 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 Coupeville in September

Weather and climate in Coupeville in September

This data display average monthly climate indicators in Coupeville in September 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 temperature67°F
  • Average LOW temperature47°F
  • Average rainfall days8 days
  • Average rainfall33mm/1.3''

Coupeville 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 September?

Want to know where the water temperature in September 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 September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Oak Harbor54.3°F50.4°F59.2°F
Port Townsend53.8°F49.8°F57.6°F
Bowman Bay54.7°F50.7°F59.4°F
Deception Pass54.7°F50.7°F59.4°F
Discovery Bay53.1°F49.8°F57.6°F
Sequim52.7°F49.8°F57.2°F
Port Ludlow55°F51.3°F59.7°F
Langley56.5°F51.3°F62.8°F
Warm Beach56.7°F51.3°F64.6°F
Lopez Island53.1°F50.5°F56.7°F

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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 Coupeville 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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