Lake Sacajawea — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Sacajawea, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Sacajawea today is 21.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 14 | 23.6°C | 23.2°C | |
| SEP 15 | 23.6°C | 23.2°C | |
| SEP 16 | 23.0°C | 23.2°C | |
| SEP 17 | 22.4°C | 23.2°C | |
| SEP 18 | 22.3°C | 23.2°C | |
| SEP 19 | 21.8°C | 23.2°C | |
| SEP 20 | 22.3°C | 23.2°C | |
| SEP 21 | 21.7°C | 23.2°C | |
| SEP 22 | 23.2°C | 21.8°C | |
| SEP 23 | 23.2°C | 21.9°C | |
| SEP 24 | 23.2°C | 21.9°C | |
| SEP 25 | 23.2°C | 22.0°C | |
| SEP 26 | 23.2°C | 22.1°C | |
| SEP 27 | 23.2°C | 22.2°C | |
| SEP 28 | 23.2°C | 22.2°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 3°C | 7°C |
| February | 1°C | 4°C | 7°C |
| March | 3°C | 7°C | 10°C |
| April | 8°C | 12°C | 15°C |
| May | 13°C | 17°C | 22°C |
| June | 15°C | 19°C | 23°C |
| July | 19°C | 25°C | 31°C |
| August | 22°C | 26°C | 30°C |
| September | 20°C | 23°C | 27°C |
| October | 14°C | 18°C | 21°C |
| November | 5°C | 11°C | 15°C |
| December | 3°C | 6°C | 8°C |
Lake Sacajawea: Water Temperature by Location
Lake Sacajawea: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Lake Sacajawea’s water temperatures vary considerably through the year because it is a relatively shallow, inland lake in Washington. In early spring the surface water typically sits around 40–60°F (4–16°C) as runoff and cooler air keep it brisk. By summer, surface temperatures commonly warm to roughly 60–75°F (15–24°C) on warm, sunny days, although deeper or shaded spots remain cooler. Fall brings a steady cooling back into the 45–60°F (7–16°C) range as air temperatures drop, and winter surface temperatures frequently fall to about 35–45°F (2–7°C) and can approach freezing at the margins in cold spells.
Swimming is generally possible but comes with caveats. Public access and park areas around the lake allow people to enter the water, and many locals swim during the warmest weeks when surface temperatures are most comfortable. However, there are usually no lifeguards, water quality and clarity can vary, and cooler or changing temperatures make hypothermia a real risk outside peak summer conditions. Boat traffic and submerged hazards also mean swimmers should choose designated or well-used spots, heed posted rules and advisories, and avoid solo or unsupervised swims.