Water temperature in Cook Inlet (AK) in April
Is it warm enough to swim in Cook Inlet in April? Average water temperature in Cook Inlet in April is 35.4°F and therefore is not suitable for comfortable swimming. The warmest sea in Cook Inlet in April is 41.4°F, and the coldest is 31.6°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Cook Inlet
Changes water temperature in Cook Inlet in April 2025, 2024
To get an accurate forecast for the water temperature in Cook Inlet for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Cook Inlet, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of April.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| April 1 | 36.9°F | 34.5°F | 32.2°F | 36.9°F |
| April 2 | 36.9°F | 34.7°F | 32.2°F | 36.9°F |
| April 3 | 37.4°F | 34.9°F | 32.2°F | 37.4°F |
| April 4 | 37.4°F | 35.1°F | 32.5°F | 37.4°F |
| April 5 | 37.4°F | 35.4°F | 32.7°F | 37.4°F |
| April 6 | 37.2°F | 34.3°F | 32.9°F | 37.2°F |
| April 7 | 37°F | 34.7°F | 32.9°F | 37.6°F |
| April 8 | 37°F | 34.7°F | 31.8°F | 38.3°F |
| April 9 | 37°F | 34.9°F | 31.6°F | 38.3°F |
| April 10 | 36.7°F | 35.2°F | 32°F | 38.3°F |
| April 11 | 36.9°F | 35.2°F | 31.6°F | 38.7°F |
| April 12 | 36.7°F | 35.1°F | 32.2°F | 38.5°F |
| April 13 | 36.7°F | 35.6°F | 32.4°F | 38.3°F |
| April 14 | 38.3°F | 35.1°F | 32.4°F | 38.3°F |
| April 15 | 37.4°F | 34.9°F | 32.5°F | 38.1°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| April 16 | 37.4°F | 34.9°F | 32.5°F | 38.7°F |
| April 17 | 37.6°F | 34.9°F | 32.7°F | 39.6°F |
| April 18 | 37.6°F | 35.1°F | 33.1°F | 39.4°F |
| April 19 | 37.9°F | 35.1°F | 32.7°F | 39.6°F |
| April 20 | 38.1°F | 35.4°F | 32.5°F | 39.7°F |
| April 21 | 38.3°F | 35.8°F | 33.3°F | 40.6°F |
| April 22 | 38.5°F | 36.3°F | 33.4°F | 40.6°F |
| April 23 | 38.7°F | 37°F | 33.6°F | 40.6°F |
| April 24 | 38.7°F | 36.1°F | 33.1°F | 40.8°F |
| April 25 | 38.5°F | 36.3°F | 33.1°F | 41.2°F |
| April 26 | 38.7°F | 36.9°F | 33.6°F | 41.2°F |
| April 27 | 38.7°F | 36°F | 34°F | 41.4°F |
| April 28 | 39.7°F | 37.2°F | 35.1°F | 41.4°F |
| April 29 | 38.8°F | 36.5°F | 35.1°F | 41.2°F |
| April 30 | 39°F | 35.8°F | 35.4°F | 41°F |
Average water temperature in Cook Inlet in April over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 39°F | 36.3°F | 36.3°F | 38.3°F | 34.2°F |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 33.4°F | 36°F | 34.3°F | 35.4°F | 37.8°F |
Cook Inlet sea state in April
Chart comparing the height of waves in Cook Inlet in April 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.
Cook Inlet water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
