Franklin D Roosevelt Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Franklin D Roosevelt Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Franklin D Roosevelt Lake today is 16.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 |
|---|---|---|---|
| JUN 3 | 17.1°C | 15.5°C | |
| JUN 4 | 17.1°C | 15.5°C | |
| JUN 5 | 17.1°C | 15.5°C | |
| JUN 6 | 17.1°C | 15.5°C | |
| JUN 7 | 16.2°C | 15.5°C | |
| JUN 8 | 16.2°C | 15.5°C | |
| JUN 11 | 15.5°C | 16.1°C | |
| JUN 12 | 15.5°C | 16.0°C | |
| JUN 13 | 15.5°C | 16.0°C | |
| JUN 14 | 15.5°C | 16.0°C | |
| JUN 15 | 15.5°C | 16.0°C | |
| JUN 16 | 15.5°C | 15.9°C | |
| JUN 17 | 15.5°C | 15.9°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 | 2°C | 5°C |
| February | 1°C | 4°C | 7°C |
| March | 1°C | 4°C | 7°C |
| April | 0°C | 6°C | 13°C |
| May | 7°C | 13°C | 19°C |
| June | 11°C | 16°C | 20°C |
| July | 15°C | 19°C | 23°C |
| August | 20°C | 22°C | 25°C |
| September | 14°C | 19°C | 23°C |
| October | 6°C | 12°C | 18°C |
| November | 3°C | 8°C | 13°C |
| December | 1°C | 4°C | 7°C |
Franklin D Roosevelt Lake: Water Temperature by Location
Franklin D Roosevelt Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Franklin D. Roosevelt Lake, often called Lake Roosevelt, is a large Columbia River reservoir behind Grand Coulee Dam in Washington. Surface water temperatures vary with season and location on the reservoir; typical winter surface temperatures are near freezing to the mid-40s °F (about 1–7 °C). In spring the lake commonly warms to roughly 45–60 °F (7–16 °C) as air temperatures rise. Summer is the warmest period, with many open-water areas and shallow bays generally reaching about 60–75 °F (16–24 °C), and some sheltered shallow spots occasionally approaching 80 °F (27 °C). In autumn the surface cools again to a range around 50–65 °F (10–18 °C) before winter turnover.
Swimming is generally allowed at public recreation sites and beaches along Lake Roosevelt because the reservoir is managed for multiple uses including recreation, but it is not supervised in most locations and some areas are off-limits for safety or operational reasons near the dam, intake structures and boat channels. Swimmers should be aware of cold-water shock even in summer, changing weather, boat traffic, steep drop-offs, and occasional water-quality advisories. Choosing designated swimming areas at parks or marinas, wearing a life jacket when appropriate, and checking local conditions helps reduce risks.