Water temperature in Mission Bay (CA) in September

Is it warm enough to swim in Mission Bay in September? Average water temperature in Mission Bay in September is 68.9°F and therefore suitable for comfortable swimming. The warmest sea in Mission Bay in September is 75.4°F, and the coldest is 63.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Mission Bay

Changes water temperature in Mission Bay in September 2025, 2024

To get an accurate forecast for the water temperature in Mission Bay for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Mission Bay, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

Average water temperature in Mission Bay in September over a decade

Chart comparing the height of waves in Mission Bay 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.

You can also view information about water temperature for other months by clicking on the month button below

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

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Our report for Mission Bay 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.