World sea water temperatures

Water temperature in Fontana (CA) in September

Is it warm enough to swim in Fontana in September? Average water temperature in Fontana in September is 79.7°F and therefore suitable for comfortable swimming. The warmest water in Fontana in September is 91.4°F, and the coldest is 66.2°F. To find out the water temperature today and in the coming days, go to Current water temperature in Fontana

Changes water temperature in Fontana in September 2025, 2024

To get an accurate forecast for the water temperature in Fontana for any chosen month, compare two years within a 10 year range using the chart below.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024
September 184.2°F80.6°F
September 284.2°F80.6°F
September 384.2°F82.4°F
September 484.2°F82.4°F
September 584.2°F82.4°F
September 684.2°F84.2°F
September 7 84.2°F
September 8 84.2°F
September 9 84.2°F
September 10 84.2°F
September 11 82.4°F
September 12 80.6°F
September 13 77°F
September 14 73.4°F
September 15 69.8°F
Day 2025 2024
September 16 68°F
September 17 68°F
September 18 66.2°F
September 19 66.2°F
September 20 66.2°F
September 21 68°F
September 22 71.6°F
September 23 73.4°F
September 24 73.4°F
September 25 73.4°F
September 26 75.2°F
September 27 75.2°F
September 28 75.2°F
September 29 77°F
September 30 77°F

Fontana 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

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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 Fontana 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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