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 21°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 | 22.3°C | 22.5°C | |
| SEP 15 | 22.3°C | 22.5°C | |
| SEP 16 | 22.2°C | 22.5°C | |
| SEP 17 | 22.1°C | 22.5°C | |
| SEP 18 | 20.9°C | 22.5°C | |
| SEP 19 | 20.9°C | 22.5°C | |
| SEP 20 | 21.5°C | 22.5°C | |
| SEP 21 | 21.0°C | 22.5°C | |
| SEP 22 | 22.5°C | 21.1°C | |
| SEP 23 | 22.5°C | 21.2°C | |
| SEP 24 | 22.5°C | 21.2°C | |
| SEP 25 | 22.5°C | 21.3°C | |
| SEP 26 | 22.5°C | 21.4°C | |
| SEP 27 | 22.5°C | 21.5°C | |
| SEP 28 | 22.5°C | 21.5°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
September 21
September 22
September 23
September 24
September 25
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.