World sea water temperatures

Water temperature in Eureka (CA) in September

Is it warm enough to swim in Eureka in September? Average water temperature in Eureka in September is 55.2°F and therefore is not suitable for comfortable swimming. The warmest sea in Eureka in September is 61.5°F, and the coldest is 49.1°F. Average high air temperature in Eureka in September is 64°F, and average low temperature is 50°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Eureka

Changes water temperature in Eureka in September 2025, 2024

To get an accurate forecast for the water temperature in Eureka for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Eureka, 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 156.3°F57°F49.3°F61°F
September 256.5°F56.8°F49.1°F61°F
September 356.3°F57°F50.2°F60.4°F
September 456.5°F56.7°F50.2°F60.3°F
September 556.7°F56.3°F51.6°F60.4°F
September 657.2°F53.1°F52°F60.1°F
September 756.3°F54.1°F52.2°F60.1°F
September 857°F52.3°F51.8°F58.8°F
September 957.7°F53.6°F51.6°F58.6°F
September 1056.8°F51.8°F51.6°F58.5°F
September 1157°F53.6°F51.8°F57.7°F
September 1256.5°F56.5°F52.2°F57.6°F
September 1358.5°F56.7°F52°F58.5°F
September 1457.2°F56.1°F52.2°F57.2°F
September 1557.2°F56.8°F52.3°F57.7°F
Day 2025 2024 Min Max
September 1657.2°F55.4°F52.5°F58.1°F
September 1754.9°F54.9°F52.7°F58.3°F
September 1853.2°F55.2°F52.9°F59.5°F
September 1954.5°F54.1°F52.7°F58.6°F
September 2055.4°F54.7°F53.6°F58.8°F
September 2155.9°F54.3°F53.4°F59°F
September 2256.1°F53.6°F52.9°F59.5°F
September 2356.5°F54.7°F53.2°F60.3°F
September 2456.5°F55.2°F53.4°F60.8°F
September 2554.9°F55°F53.2°F60.8°F
September 2656.1°F54.9°F53.1°F61.2°F
September 27 53.6°F52.7°F61.5°F
September 28 51.1°F51.1°F60.8°F
September 29 53.1°F52.9°F60.6°F
September 30 52°F52°F60.3°F
Eureka water temp chart in September

Average water temperature in Eureka in September over a decade

20152016201720182019
56.1°F54.3°F56.5°F54°F57.7°F
20202021202220232024
56.1°F53.4°F55.4°F55°F54.7°F

Eureka sea state in September

Chart comparing the height of waves in Eureka 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 Eureka in September

Weather and climate in Eureka in September

This data display average monthly climate indicators in Eureka 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 temperature64°F
  • Average LOW temperature50°F
  • Average rainfall days4 days
  • Average rainfall15mm/0.6''
  • Average sunshine7.3h

Eureka 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

Best Beach Resorts in California in September

Places with the warmest average sea water temperature in California in September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
San Diego69.1°F63.1°F75.6°F
Santa Monica68.4°F62.6°F73.4°F
La Jolla Cove70°F63.7°F76.1°F
Lake Tahoe64.9°F59°F70.5°F
Los Angeles68.2°F61.5°F74.3°F
Samoa55.2°F48.7°F61.3°F
King Salmon55°F48.7°F61.5°F
Humboldt Beach55.2°F49.3°F61.3°F
Manila55.2°F49.3°F61.3°F
McKinleyville55.2°F49.3°F61.2°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 Eureka 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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