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Water temperature in Ashtabula (OH) in September

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Is it warm enough to swim in Ashtabula in September? Average water temperature in Ashtabula in September is 70.9°F and therefore suitable for comfortable swimming. The warmest water in Ashtabula in September is 78.1°F, and the coldest is 63.7°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Ashtabula

Changes water temperature in Ashtabula in September 2025, 2024

To get an accurate forecast for the water temperature in Ashtabula for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Ashtabula, 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 170.2°F73.4°F70.2°F78.1°F
September 270.2°F72.7°F70.2°F76.6°F
September 370.5°F72.3°F70.3°F76.1°F
September 470.5°F72°F70.2°F75.7°F
September 5 71.8°F69.6°F76.6°F
September 6 71.2°F69.6°F77°F
September 7 70.3°F69.3°F76.3°F
September 8 69.1°F69.1°F75.6°F
September 9 68.9°F68.4°F75.9°F
September 10 69.1°F68.2°F75.7°F
September 11 69.1°F68°F75.2°F
September 12 68.7°F68.2°F75.2°F
September 13 69.3°F68.4°F75.2°F
September 14 69.3°F68.9°F74.7°F
September 15 69.3°F68.9°F74.5°F
Day 2025 2024 Min Max
September 16 69.6°F69.4°F73.4°F
September 17 69.8°F68.5°F73.2°F
September 18 70°F68.2°F73.2°F
September 19 70°F67.8°F74.1°F
September 20 70°F68°F73.9°F
September 21 70.5°F67.8°F73.6°F
September 22 71.1°F65.8°F73.2°F
September 23 71.1°F66°F73.2°F
September 24 70.9°F66°F73.2°F
September 25 69.8°F65.7°F72.1°F
September 26 70.3°F65.7°F73.2°F
September 27 70°F64.4°F73.6°F
September 28 69.6°F64.2°F72.1°F
September 29 70.2°F64°F71.4°F
September 30 70°F63.7°F70°F
Ashtabula water temp chart in September

Average water temperature in Ashtabula in September over a decade

20152016201720182019
71.1°F73.8°F70.2°F72.3°F70.9°F
20202021202220232024
70.3°F72.5°F69.6°F71.2°F70.3°F

Ashtabula sea state in September

Chart comparing the height of waves in Ashtabula 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 Ashtabula in September

Ashtabula 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
Conneaut71.1°F64.6°F77.4°F
Fairport Harbor71.2°F64.4°F77.2°F
Headlands Beach71.4°F64.4°F77.4°F
Presque Isle Bay71.1°F64.2°F78.1°F
Mentor on the Lake71.4°F64.9°F77.4°F
Port Bruce70.7°F64.4°F76.8°F
Port Burwell70.3°F64°F76.6°F
Long Point70.3°F63.7°F76.8°F
Euclid71.6°F65.1°F77.7°F
Port Stanley70.7°F63.9°F76.5°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 Ashtabula 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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