Water temperature in Seattle (WA) in December
Is it warm enough to swim in Seattle in December? Average water temperature in Seattle in December is 47.5°F and therefore is not suitable for comfortable swimming. The warmest sea in Seattle in December is 50.5°F, and the coldest is 44.2°F. Average high air temperature in Seattle in December is 46°F, and average low temperature is 36°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Seattle
Changes water temperature in Seattle in December 2024, 2023
To get an accurate forecast for the water temperature in Seattle for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Seattle, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of December.
You can choose any other years:
| Day | 2024 | 2023 | Min | Max |
|---|---|---|---|---|
| December 1 | 49.1°F | 48.6°F | 46.2°F | 50.4°F |
| December 2 | 48.9°F | 48.6°F | 46.2°F | 50.2°F |
| December 3 | 48.7°F | 48.4°F | 46°F | 50.4°F |
| December 4 | 48.6°F | 48.7°F | 46.9°F | 48.9°F |
| December 5 | 48.9°F | 48.7°F | 46.6°F | 48.9°F |
| December 6 | 48.6°F | 48.6°F | 45.7°F | 49.6°F |
| December 7 | 48.7°F | 48.4°F | 45.5°F | 49.5°F |
| December 8 | 48.6°F | 49.3°F | 45.1°F | 49.3°F |
| December 9 | 48°F | 48.7°F | 45.1°F | 49.1°F |
| December 10 | 47.5°F | 48.6°F | 45.1°F | 48.7°F |
| December 11 | 47.7°F | 48.2°F | 45.1°F | 48.4°F |
| December 12 | 47.5°F | 47.5°F | 45.1°F | 50.2°F |
| December 13 | 47.1°F | 48.6°F | 45.1°F | 49.5°F |
| December 14 | 47.7°F | 48.4°F | 45.3°F | 50.2°F |
| December 15 | 48.6°F | 48.4°F | 45.5°F | 49.8°F |
| Day | 2024 | 2023 | Min | Max |
|---|---|---|---|---|
| December 16 | 48.4°F | 47.8°F | 44.6°F | 49.5°F |
| December 17 | 48.2°F | 47.8°F | 44.6°F | 48.7°F |
| December 18 | 48.9°F | 47.8°F | 44.8°F | 49.1°F |
| December 19 | 48.9°F | 48°F | 44.6°F | 49.5°F |
| December 20 | 49.1°F | 48.7°F | 46.2°F | 49.1°F |
| December 21 | 48.7°F | 48.4°F | 45.1°F | 48.9°F |
| December 22 | 48.9°F | 48.6°F | 46.6°F | 48.9°F |
| December 23 | 49.5°F | 48.6°F | 46.6°F | 49.5°F |
| December 24 | 49.1°F | 47.3°F | 44.6°F | 49.1°F |
| December 25 | 49.1°F | 47.1°F | 45.7°F | 49.1°F |
| December 26 | 48.7°F | 48.9°F | 44.6°F | 48.9°F |
| December 27 | 48.4°F | 48.6°F | 44.4°F | 48.6°F |
| December 28 | 49.1°F | 48.2°F | 44.4°F | 49.1°F |
| December 29 | 48.7°F | 48°F | 45.7°F | 48.7°F |
| December 30 | 48.2°F | 47.8°F | 44.2°F | 48.2°F |
| December 31 | 48.4°F | 48.6°F | 45.5°F | 48.6°F |
Average water temperature in Seattle in December over a decade
| 2015 | 2016 | 2017 | 2018 | 2019 |
| 47.7°F | 48.7°F | 47.8°F | 48.9°F | 48.6°F |
| 2020 | 2021 | 2022 | 2023 | 2024 |
| 48°F | 48.4°F | 47.3°F | 48.4°F | 48.6°F |
Seattle sea state in December
Chart comparing the height of waves in Seattle in December 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 Seattle in December
This data display average monthly climate indicators in Seattle in December 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 temperature46°F
- Average LOW temperature36°F
- Average humidity
80 - Average rainfall days18 days
- Average rainfall137mm/5.4''
- Average daylight8h
- Average sunshine1.7h
- Average UV index1
Seattle water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
