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Water temperature in Indianapolis (IN) in September

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Is it warm enough to swim in Indianapolis in September? Average water temperature in Indianapolis in September is 70.9°F and therefore suitable for comfortable swimming. The warmest water in Indianapolis in September is 78.8°F, and the coldest is 60.8°F. To find out the water temperature today and in the coming days, go to Current water temperature in Indianapolis

Changes water temperature in Indianapolis in September 2025, 2024

To get an accurate forecast for the water temperature in Indianapolis 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 168°F75.2°F
September 266.2°F73.4°F
September 368°F73.4°F
September 466.2°F71.6°F
September 566.2°F68°F
September 664.4°F68°F
September 764.4°F66.2°F
September 864.4°F66.2°F
September 964.4°F68°F
September 1066.2°F66.2°F
September 1166.2°F66.2°F
September 1268°F68°F
September 1371.6°F71.6°F
September 1471.6°F73.4°F
September 1573.4°F73.4°F
Day 2025 2024
September 1673.4°F73.4°F
September 1773.4°F73.4°F
September 1873.4°F75.2°F
September 1973.4°F75.2°F
September 2073.4°F75.2°F
September 2173.4°F73.4°F
September 2273.4°F73.4°F
September 2371.6°F71.6°F
September 2469.8°F71.6°F
September 2569.8°F69.8°F
September 2669.8°F69.8°F
September 2769.8°F68°F
September 2869.8°F68°F
September 2969.8°F68°F
September 3069.8°F66.2°F

Indianapolis 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 Indianapolis 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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