Water temperature in Crystal Lake (IL) in September
Is it warm enough to swim in Crystal Lake in September? Average water temperature in Crystal Lake in September is 66.7°F and therefore is not suitable for comfortable swimming. The warmest water in Crystal Lake in September is 77°F, and the coldest is 53.6°F. To find out the water temperature today and in the coming days, go to Current water temperature in Crystal Lake
Changes water temperature in Crystal Lake in September 2025, 2024
To get an accurate forecast for the water temperature in Crystal Lake for any chosen month, compare two years within a 10 year range using the chart below.
You can choose any other years:
| Day | 2025 | 2024 |
|---|---|---|
| September 1 | 64.4°F | 69.8°F |
| September 2 | 62.6°F | 68°F |
| September 3 | 62.6°F | 68°F |
| September 4 | 60.8°F | 66.2°F |
| September 5 | 59°F | 62.6°F |
| September 6 | 59°F | 60.8°F |
| September 7 | 59°F | 62.6°F |
| September 8 | 59°F | 62.6°F |
| September 9 | 60.8°F | 62.6°F |
| September 10 | 62.6°F | 64.4°F |
| September 11 | 64.4°F | 64.4°F |
| September 12 | 66.2°F | 66.2°F |
| September 13 | 68°F | 69.8°F |
| September 14 | 68°F | 69.8°F |
| September 15 | 69.8°F | 71.6°F |
| Day | 2025 | 2024 |
|---|---|---|
| September 16 | 69.8°F | 69.8°F |
| September 17 | 69.8°F | 69.8°F |
| September 18 | 69.8°F | 71.6°F |
| September 19 | 69.8°F | 71.6°F |
| September 20 | 69.8°F | 69.8°F |
| September 21 | 69.8°F | 68°F |
| September 22 | 68°F | 66.2°F |
| September 23 | 68°F | 66.2°F |
| September 24 | 66.2°F | 66.2°F |
| September 25 | 66.2°F | 64.4°F |
| September 26 | 68°F | 64.4°F |
| September 27 | 64.4°F | |
| September 28 | 64.4°F | |
| September 29 | 64.4°F | |
| September 30 | 64.4°F |
Crystal Lake water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
