World sea water temperatures

Water temperature in Los Osos (CA) in September

Is it warm enough to swim in Los Osos in September? Average water temperature in Los Osos in September is 59.4°F and therefore is not suitable for comfortable swimming. The warmest sea in Los Osos in September is 66.7°F, and the coldest is 55.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Los Osos

Changes water temperature in Los Osos in September 2025, 2024

To get an accurate forecast for the water temperature in Los Osos for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Los Osos, 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 160.8°F57.9°F55.2°F61.2°F
September 261.7°F58.3°F55.9°F61.7°F
September 362.2°F58.5°F56.1°F62.2°F
September 460.8°F58.3°F56.1°F61.5°F
September 5 57.9°F55.2°F62.2°F
September 6 58.1°F55.4°F62.6°F
September 7 58.1°F55.6°F62.8°F
September 8 57.2°F55.8°F63°F
September 9 57°F56.1°F64.2°F
September 10 57.4°F55.9°F64.9°F
September 11 57.2°F55.9°F65.3°F
September 12 57°F56.3°F66.4°F
September 13 56.7°F56.3°F66°F
September 14 57.6°F56.5°F64.4°F
September 15 57.7°F56.3°F63.9°F
Day 2025 2024 Min Max
September 16 57.4°F56.7°F63.7°F
September 17 57.9°F56.7°F64.4°F
September 18 57.2°F56.7°F64.2°F
September 19 57.6°F56.7°F64°F
September 20 57.2°F56.7°F64.6°F
September 21 57.4°F56.1°F65.8°F
September 22 58.1°F56.1°F66.7°F
September 23 58.5°F56.1°F65.8°F
September 24 58.1°F56.3°F66.2°F
September 25 59.2°F57°F66.2°F
September 26 59.5°F55.9°F66.2°F
September 27 59.9°F55.6°F66°F
September 28 60.8°F55.9°F66.2°F
September 29 61.5°F56.8°F66.4°F
September 30 59.5°F56.1°F65.3°F
Los Osos water temp chart in September

Average water temperature in Los Osos in September over a decade

20152016201720182019
64.2°F59.5°F61°F59°F58.3°F
20202021202220232024
58.5°F58.6°F59.7°F59.9°F58.1°F

Los Osos sea state in September

Chart comparing the height of waves in Los Osos 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 Los Osos in September

Los Osos 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
Arroyo Grande59.7°F54.7°F66.2°F
Grover Beach59.7°F54.7°F66.2°F
Shell Beach59.7°F54.7°F66.2°F
Oceano59.7°F54.7°F66.2°F
Sand Dollar Beach58.8°F51.6°F67.6°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 Los Osos 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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