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Water temperature in Arroyo Grande (CA) in September

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Is it warm enough to swim in Arroyo Grande in September? Average water temperature in Arroyo Grande in September is 59.7°F and therefore is not suitable for comfortable swimming. The warmest sea in Arroyo Grande in September is 66.2°F, and the coldest is 54.7°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Arroyo Grande

Changes water temperature in Arroyo Grande in September 2025, 2024

To get an accurate forecast for the water temperature in Arroyo Grande for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Arroyo Grande, 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 164°F60.3°F55.8°F64°F
September 263°F59.9°F56.3°F63°F
September 363.7°F60.4°F56.3°F63.7°F
September 463°F59.9°F56.8°F63°F
September 561.7°F59°F55.9°F62.6°F
September 6 59.5°F56.1°F63.1°F
September 7 59°F56.3°F63.7°F
September 8 59°F56.3°F63.5°F
September 9 58.5°F56.5°F64.4°F
September 10 57.9°F56.1°F65.7°F
September 11 57.6°F56.3°F65.8°F
September 12 56.5°F56.5°F66.2°F
September 13 56.1°F56.1°F66°F
September 14 54.7°F54.7°F65.7°F
September 15 55.9°F55°F65.3°F
Day 2025 2024 Min Max
September 16 57°F55.4°F64.8°F
September 17 59.2°F56.5°F64.8°F
September 18 58.5°F56.1°F64.4°F
September 19 59°F56.7°F64.4°F
September 20 59.2°F56.7°F65.1°F
September 21 59.4°F55.6°F65.7°F
September 22 59.7°F55.8°F65.8°F
September 23 59.9°F55.8°F65.5°F
September 24 59.4°F56.1°F66.2°F
September 25 60.1°F56.8°F66.2°F
September 26 60.1°F56.1°F66.2°F
September 27 60.3°F55.9°F66.2°F
September 28 60.4°F55.9°F66.2°F
September 29 60.1°F56.3°F65.8°F
September 30 60.4°F56.5°F64.9°F
Arroyo Grande water temp chart in September

Average water temperature in Arroyo Grande in September over a decade

20152016201720182019
64.8°F59.7°F61°F59.5°F59.7°F
20202021202220232024
59.4°F57.7°F61.2°F60.6°F58.8°F

Arroyo Grande sea state in September

Chart comparing the height of waves in Arroyo Grande 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 Arroyo Grande in September

Arroyo Grande 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
Grover Beach59.7°F54.7°F66.2°F
Shell Beach59.7°F54.7°F66.2°F
Oceano59.7°F54.7°F66.2°F
Cambria59.4°F54.3°F67.3°F
Gaviota64°F57.2°F72.1°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 Arroyo Grande 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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