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Water temperature in Isla San Francisco (BCS) in September

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Is it warm enough to swim in Isla San Francisco in September? Average water temperature in Isla San Francisco in September is 85.6°F and therefore suitable for comfortable swimming. The warmest sea in Isla San Francisco in September is 89.2°F, and the coldest is 81.9°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Isla San Francisco

Changes water temperature in Isla San Francisco in September 2025, 2024

To get an accurate forecast for the water temperature in Isla San Francisco for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Isla San Francisco, 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 187.3°F85.6°F84.7°F88.7°F
September 286.7°F85.8°F84.6°F88.3°F
September 386.5°F86.5°F82.6°F88.5°F
September 486.4°F86.4°F82.4°F88.3°F
September 586.2°F85.6°F83.1°F88°F
September 6 86.4°F82.9°F88°F
September 7 87.1°F82.2°F89.2°F
September 8 86.2°F81.9°F87.6°F
September 9 86.7°F82.2°F87.6°F
September 10 86.7°F82.4°F87.3°F
September 11 86.5°F81.9°F87.3°F
September 12 86.2°F82°F87.4°F
September 13 86°F82.8°F88.2°F
September 14 86.2°F82.9°F88.2°F
September 15 85.8°F83.5°F87.8°F
Day 2025 2024 Min Max
September 16 85.3°F83.1°F88°F
September 17 84.7°F82.6°F88°F
September 18 84°F83.1°F88.9°F
September 19 83.7°F83.7°F88°F
September 20 83.8°F83.8°F87.6°F
September 21 83.7°F83.7°F88°F
September 22 83.8°F83.8°F88.9°F
September 23 84.4°F83.7°F88.5°F
September 24 84.6°F83.8°F87.4°F
September 25 84.4°F84°F88.3°F
September 26 84.6°F84.2°F88.5°F
September 27 84.2°F83.7°F88.5°F
September 28 84.6°F82.4°F88.5°F
September 29 84.4°F83.8°F87.8°F
September 30 84.2°F84.2°F88°F
Isla San Francisco water temp chart in September

Average water temperature in Isla San Francisco in September over a decade

20152016201720182019
87.3°F84.6°F84.6°F86.2°F85.3°F
20202021202220232024
85.6°F85.1°F84.4°F87.8°F85.3°F

Isla San Francisco sea state in September

Chart comparing the height of waves in Isla San Francisco 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 Isla San Francisco in September

Isla San Francisco 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
El Sargento85.3°F80.6°F88.7°F
La Ventana85.5°F80.4°F88.9°F
Isla del Carmen86.5°F83.1°F90°F
Los Barriles85.6°F80.1°F89.1°F
Buena Vista85.6°F80.1°F88.9°F
Todos Santos83.1°F77.4°F87.1°F
Punta Lobos83.1°F77.4°F87.1°F
El Pescadero83.1°F77.4°F87.1°F
La Ribera85.8°F80.2°F88.9°F
Cerritos Beach83.1°F76.5°F87.3°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 Isla San Francisco 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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