Lake Umatilla — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Umatilla, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Umatilla today is 19.1°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 | 21.3°C | 20.0°C | |
| JUN 24 | 21.4°C | 20.0°C | |
| JUN 25 | 21.4°C | 20.0°C | |
| JUN 26 | 21.5°C | 20.0°C | |
| JUN 27 | 21.1°C | 20.0°C | |
| JUN 28 | 20.8°C | 20.0°C | |
| JUN 29 | 20.3°C | 20.0°C | |
| JUN 30 | 19.7°C | 20.0°C | |
| JUL 1 | 24.5°C | 19.4°C | |
| JUL 2 | 24.5°C | 19.6°C | |
| JUL 3 | 24.5°C | 19.9°C | |
| JUL 4 | 24.5°C | 20.2°C | |
| JUL 5 | 24.5°C | 20.5°C | |
| JUL 6 | 24.5°C | 20.7°C | |
| JUL 7 | 24.5°C | 21.0°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 | 2°C | 5°C | 8°C |
| March | 4°C | 8°C | 11°C |
| April | 8°C | 12°C | 15°C |
| May | 12°C | 17°C | 21°C |
| June | 16°C | 20°C | 24°C |
| July | 18°C | 25°C | 31°C |
| August | 20°C | 25°C | 30°C |
| September | 19°C | 23°C | 26°C |
| October | 11°C | 16°C | 20°C |
| November | 7°C | 11°C | 14°C |
| December | 4°C | 7°C | 11°C |
Lake Umatilla: Water Temperature by Location
Lake Umatilla: Weather Forecast
July 1
July 2
July 3
July 4
Location & Local Information
Lake Umatilla is a reservoir on the Columbia River along the Oregon-Washington border; because it is a large, flowing impoundment its surface temperatures vary noticeably through the year. In winter the water is cold, commonly in the low 40s °F (about 4–7 °C). Spring brings a gradual warming into the mid-40s to mid-50s °F (8–13 °C) as runoff and air temperatures rise. By summer the surface often reaches the comfortable range of roughly 60–70 °F (15–21 °C), and on warm, calm spells can climb into the low- to mid-70s °F (about 22–24 °C). Temperatures typically decline again in autumn, falling back through the 50s °F (10–15 °C) as the season progresses.
Swimming is generally possible at Lake Umatilla, particularly in summer when surface temperatures are warmest, but it is not uniformly recommended everywhere. Because this is a reservoir on a major river, boat traffic, variable currents, sudden depth changes and occasional water-quality advisories can affect safety; areas near the dam or busy launches are hazardous. Local parks and beaches with posted swim zones are the safest places to enter the water, and seasonal advisories about algae or bacterial concerns should be checked before swimming. Even in summer, cold-water shock and hypothermia risk from cooler, deeper water means caution is warranted.