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 19.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 23 | 18.2°C | 16.1°C | |
| JUN 24 | 21.1°C | 16.1°C | |
| JUN 25 | 21.2°C | 16.1°C | |
| JUN 26 | 21.2°C | 16.1°C | |
| JUN 27 | 19.5°C | 16.1°C | |
| JUN 28 | 19.4°C | 16.1°C | |
| JUN 29 | 19.2°C | 16.1°C | |
| JUN 30 | 19.3°C | 16.1°C | |
| JUL 1 | 19.0°C | 19.3°C | |
| JUL 2 | 19.0°C | 19.3°C | |
| JUL 3 | 19.0°C | 19.3°C | |
| JUL 4 | 19.0°C | 19.2°C | |
| JUL 5 | 19.0°C | 19.2°C | |
| JUL 6 | 19.0°C | 19.2°C | |
| JUL 7 | 19.0°C | 19.2°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 | 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 | 22°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
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July 6
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.