Water temperature in Folsom Lake (CA) in January
Is it warm enough to swim in Folsom Lake in January? Average water temperature in Folsom Lake in January is 48°F and therefore is not suitable for comfortable swimming. The warmest water in Folsom Lake in January is 55.4°F, and the coldest is 41°F. To find out the water temperature today and in the coming days, go to Current water temperature in Folsom Lake
Changes water temperature in Folsom Lake in January 2026, 2025
To get an accurate forecast for the water temperature in Folsom Lake for any chosen month, compare two years within a 10 year range using the chart below.
You can choose any other years:
| Day | 2026 | 2025 |
|---|---|---|
| January 1 | 50°F | 51.8°F |
| January 2 | 51.8°F | |
| January 3 | 51.8°F | 48.2°F |
| January 4 | 53.6°F | 48.2°F |
| January 5 | 53.6°F | 50°F |
| January 6 | 53.6°F | 50°F |
| January 7 | 53.6°F | 50°F |
| January 8 | 51.8°F | 50°F |
| January 9 | 50°F | 50°F |
| January 10 | 48.2°F | 50°F |
| January 11 | 46.4°F | 50°F |
| January 12 | 46.4°F | 50°F |
| January 13 | 46.4°F | 48.2°F |
| January 14 | 46.4°F | 48.2°F |
| January 15 | 48.2°F | 48.2°F |
| Day | 2026 | 2025 |
|---|---|---|
| January 16 | 48.2°F | 46.4°F |
| January 17 | 48.2°F | 46.4°F |
| January 18 | 48.2°F | 46.4°F |
| January 19 | 48.2°F | 46.4°F |
| January 20 | 48.2°F | 46.4°F |
| January 21 | 48.2°F | 46.4°F |
| January 22 | 48.2°F | 46.4°F |
| January 23 | 48.2°F | 46.4°F |
| January 24 | 48.2°F | 46.4°F |
| January 25 | 48.2°F | 46.4°F |
| January 26 | 48.2°F | 46.4°F |
| January 27 | 48.2°F | 46.4°F |
| January 28 | 50°F | 44.6°F |
| January 29 | 50°F | 44.6°F |
| January 30 | 50°F | 46.4°F |
| January 31 | 50°F | 48.2°F |
Folsom Lake water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
