Water temperature in Poulsbo (WA) in September
Is it warm enough to swim in Poulsbo in September? Average water temperature in Poulsbo in September is 56.5°F and therefore is not suitable for comfortable swimming. The warmest sea in Poulsbo in September is 62.8°F, and the coldest is 51.8°F. Average high air temperature in Poulsbo in September is 71°F, and average low temperature is 50°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Poulsbo
Changes water temperature in Poulsbo in September 2025, 2024
To get an accurate forecast for the water temperature in Poulsbo for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Poulsbo, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| September 1 | 63.3°F | 60.3°F | 54.9°F | 63.3°F |
| September 2 | 62.4°F | 59.5°F | 54.3°F | 62.4°F |
| September 3 | 62.8°F | 60.4°F | 54.5°F | 62.8°F |
| September 4 | 63.3°F | 59.4°F | 54.1°F | 63.3°F |
| September 5 | 62.8°F | 59.5°F | 54°F | 62.8°F |
| September 6 | 61°F | 61.5°F | 54.1°F | 61.7°F |
| September 7 | 59.9°F | 62.1°F | 53.8°F | 62.1°F |
| September 8 | 59.9°F | 60.8°F | 53.8°F | 61°F |
| September 9 | 59.9°F | 61.7°F | 53.4°F | 61.7°F |
| September 10 | 59.7°F | 60.6°F | 53.2°F | 60.6°F |
| September 11 | 59.9°F | 59.5°F | 53.4°F | 59.9°F |
| September 12 | 60.1°F | 58.3°F | 53.4°F | 60.1°F |
| September 13 | 59.2°F | 57.6°F | 53.4°F | 59.2°F |
| September 14 | 58.8°F | 57.4°F | 53.6°F | 58.8°F |
| September 15 | 59.2°F | 55.9°F | 53.6°F | 59.2°F |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| September 16 | 58.5°F | 57.2°F | 53.4°F | 58.5°F |
| September 17 | 59.7°F | 56.8°F | 53.6°F | 59.7°F |
| September 18 | 59.7°F | 57°F | 53.4°F | 59.7°F |
| September 19 | 59°F | 56.3°F | 52.9°F | 59°F |
| September 20 | 58.1°F | 56.8°F | 52.7°F | 58.1°F |
| September 21 | 57.6°F | 57.7°F | 52.9°F | 57.7°F |
| September 22 | 57.4°F | 57.2°F | 52.9°F | 57.4°F |
| September 23 | 57.4°F | 56.1°F | 52.9°F | 57.4°F |
| September 24 | 56.8°F | 58.8°F | 52.9°F | 58.8°F |
| September 25 | 56.1°F | 58.5°F | 53.1°F | 58.5°F |
| September 26 | 55.6°F | 52.9°F | 57.9°F | |
| September 27 | 55.6°F | 53.1°F | 58.1°F | |
| September 28 | 56.1°F | 52.5°F | 58.5°F | |
| September 29 | 55.2°F | 52.3°F | 58.5°F | |
| September 30 | 54.9°F | 51.8°F | 57.4°F |
Average water temperature in Poulsbo in September over a decade
| 2015 | 2016 | 2017 | 2018 | 2019 |
| 56.7°F | 56.3°F | 57.2°F | 56.5°F | 58.1°F |
| 2020 | 2021 | 2022 | 2023 | 2024 |
| 58.1°F | 57.6°F | 58.5°F | 57.7°F | 58.1°F |
Poulsbo sea state in September
Chart comparing the height of waves in Poulsbo in September 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 Poulsbo in September
This data display average monthly climate indicators in Poulsbo in September 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 temperature71°F
- Average LOW temperature50°F
- Average rainfall41mm/1.6''
Poulsbo water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
