Des Moines — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit can be used.

It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.

Water Temperature Chart Over the Last 30 Days

Currently, the sea water temperature at this location matches the average for this day in previous years.

According to our forecast, Water temperature in Des Moines will be 12.4°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Des Moines, Washington, sits on the eastern shore of Puget Sound and experiences a maritime-influenced climate that keeps the local seawater relatively cool year-round. Seasonal surface temperatures typically range from about 6–9 °C in winter, rising to roughly 7–12 °C in spring as the water begins to warm. Peak summer values on the calmest, warmest days usually fall in the 12–17 °C range, with occasional short-lived patches slightly warmer during heat events. In autumn the water cools back toward 9–12 °C as air temperatures drop and storms mix the surface layers. These values reflect general conditions for the shallow nearshore areas and can vary with tides, currents and weather patterns.