Water temperature in Chatham in September
Is it warm enough to swim in Chatham in September? Average water temperature in Chatham in September is 64.8°F and therefore is not suitable for comfortable swimming. The warmest sea in Chatham in September is 71.2°F, and the coldest is 59.2°F. Average high air temperature in Chatham in September is 69°F, and average low temperature is 58°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Chatham
Changes water temperature in Chatham in September 2025, 2024
To get an accurate forecast for the water temperature in Chatham for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Chatham, 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:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| September 1 | 64.2°F | 66.4°F | 63.7°F | 70°F |
| September 2 | 64.6°F | 66.6°F | 63.7°F | 69.6°F |
| September 3 | 65.3°F | 64.2°F | 63.9°F | 70.7°F |
| September 4 | 65.3°F | 64.8°F | 63.7°F | 71.1°F |
| September 5 | 65.5°F | 64°F | 63.7°F | 70.9°F |
| September 6 | 66°F | 64.2°F | 63.7°F | 71.2°F |
| September 7 | 67.8°F | 63°F | 63°F | 70.9°F |
| September 8 | 67.5°F | 64.9°F | 62.4°F | 70.3°F |
| September 9 | 65.5°F | 63.3°F | 63°F | 69.1°F |
| September 10 | 65.3°F | 63.5°F | 63.5°F | 70°F |
| September 11 | 64.4°F | 63°F | 63°F | 69.3°F |
| September 12 | 63.9°F | 64.2°F | 62.6°F | 68.9°F |
| September 13 | 62.8°F | 65.3°F | 62.6°F | 67.6°F |
| September 14 | 63°F | 64.9°F | 62.4°F | 68.9°F |
| September 15 | 63.3°F | 65.7°F | 62.8°F | 68.2°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| September 16 | 64.2°F | 65.3°F | 63.1°F | 67.5°F |
| September 17 | 65.1°F | 65.3°F | 61.9°F | 67.1°F |
| September 18 | 64.8°F | 65.8°F | 61.7°F | 67.5°F |
| September 19 | 64.8°F | 65.5°F | 61°F | 66.7°F |
| September 20 | 64°F | 64.8°F | 61.7°F | 66.4°F |
| September 21 | 64.8°F | 64.2°F | 61.2°F | 66.4°F |
| September 22 | 63.7°F | 63.5°F | 60.4°F | 66.4°F |
| September 23 | 63.3°F | 62.4°F | 60.3°F | 66.2°F |
| September 24 | 64.4°F | 61.7°F | 59.9°F | 66.6°F |
| September 25 | 61.5°F | 59.7°F | 65.8°F | |
| September 26 | 61.2°F | 59.2°F | 66.7°F | |
| September 27 | 61.3°F | 59.2°F | 65.8°F | |
| September 28 | 62.6°F | 59.4°F | 66°F | |
| September 29 | 62.6°F | 59.2°F | 65.5°F | |
| September 30 | 62.1°F | 59.2°F | 66°F |
Average water temperature in Chatham in September over a decade
| 2015 | 2016 | 2017 | 2018 | 2019 |
| 65.8°F | 65.5°F | 63.1°F | 67.3°F | 64°F |
| 2020 | 2021 | 2022 | 2023 | 2024 |
| 64.9°F | 66.7°F | 64.9°F | 65.1°F | 63.9°F |
Chatham sea state in September
Chart comparing the height of waves in Chatham 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.
Weather and climate in Chatham in September
This data display average monthly climate indicators in Chatham in September based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature69°F
- Average LOW temperature58°F
- Average rainfall days9 days
- Average rainfall97mm/3.8''
- Average daylight12h
- Average sunshine8h
- Average UV index6
Chatham water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
