World sea water temperatures

Water temperature in Alcatraz (CA) in September

Is it warm enough to swim in Alcatraz in September? Average water temperature in Alcatraz in September is 61.7°F and therefore is not suitable for comfortable swimming. The warmest sea in Alcatraz in September is 69.3°F, and the coldest is 55.8°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Alcatraz

Changes water temperature in Alcatraz in September 2025, 2024

To get an accurate forecast for the water temperature in Alcatraz for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Alcatraz, 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 167.8°F63.5°F56.5°F67.8°F
September 267.8°F64.4°F56.7°F67.8°F
September 367.5°F64.2°F56.7°F67.5°F
September 465.1°F65.3°F56.7°F68.5°F
September 564.9°F65.7°F56.7°F67.5°F
September 6 66.4°F56.5°F67.1°F
September 7 64.8°F56.7°F67.5°F
September 8 66.2°F56.5°F67.8°F
September 9 67.1°F56.3°F67.6°F
September 10 66.7°F56.1°F68.2°F
September 11 66.2°F55.9°F67.6°F
September 12 66.9°F56.3°F69.3°F
September 13 66.2°F56.7°F66.6°F
September 14 66.4°F57°F66.6°F
September 15 64.2°F56.5°F65.8°F
Day 2025 2024 Min Max
September 16 63.1°F56.8°F66.6°F
September 17 62.6°F57.7°F66°F
September 18 62.6°F57.4°F66.2°F
September 19 62.1°F57.7°F66°F
September 20 64°F57.2°F66.4°F
September 21 63.1°F57.2°F66°F
September 22 63.7°F56.8°F66.9°F
September 23 63.1°F57°F66.7°F
September 24 64.6°F56.8°F66.2°F
September 25 65.3°F56.8°F67.3°F
September 26 62.8°F56.7°F66.6°F
September 27 64.2°F55.8°F66.7°F
September 28 63.3°F56.1°F66.4°F
September 29 62.4°F56.3°F65.7°F
September 30 62.8°F56.3°F66.6°F
Alcatraz water temp chart in September

Average water temperature in Alcatraz in September over a decade

20152016201720182019
60.8°F59.2°F63.5°F62.8°F66°F
20202021202220232024
63.9°F66°F66.4°F66°F64.4°F

Alcatraz sea state in September

Chart comparing the height of waves in Alcatraz 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 Alcatraz in September

Alcatraz 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
Angel Island61.7°F55.8°F69.3°F
Marshall's Beach61.2°F55.8°F66.9°F
Paradise Beach Park61.7°F55.8°F68.9°F
Albany61.9°F55.8°F70.3°F
North Beach62.2°F55.8°F71.4°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 Alcatraz 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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