Water temperature in Portland (OR) in January
Is it warm enough to swim in Portland in January? Average water temperature in Portland in January is 42.1°F and therefore is not suitable for comfortable swimming. The warmest water in Portland in January is 51.8°F, and the coldest is 35.6°F. To find out the water temperature today and in the coming days, go to Current water temperature in Portland
Changes water temperature in Portland in January 2026, 2025
To get an accurate forecast for the water temperature in Portland 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 | 39.2°F | 44.6°F |
| January 2 | 39.2°F | |
| January 3 | 41°F | 42.8°F |
| January 4 | 41°F | 42.8°F |
| January 5 | 42.8°F | 44.6°F |
| January 6 | 42.8°F | 44.6°F |
| January 7 | 42.8°F | 44.6°F |
| January 8 | 41°F | 42.8°F |
| January 9 | 41°F | 42.8°F |
| January 10 | 41°F | 42.8°F |
| January 11 | 41°F | 42.8°F |
| January 12 | 42.8°F | 41°F |
| January 13 | 41°F | |
| January 14 | 39.2°F | |
| January 15 | 39.2°F |
| Day | 2026 | 2025 |
|---|---|---|
| January 16 | 39.2°F | |
| January 17 | 39.2°F | |
| January 18 | 39.2°F | |
| January 19 | 39.2°F | |
| January 20 | 37.4°F | |
| January 21 | 37.4°F | |
| January 22 | 37.4°F | |
| January 23 | 35.6°F | |
| January 24 | 35.6°F | |
| January 25 | 37.4°F | |
| January 26 | 35.6°F | |
| January 27 | 35.6°F | |
| January 28 | 35.6°F | |
| January 29 | 35.6°F | |
| January 30 | 35.6°F | |
| January 31 | 35.6°F |
Portland water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
