Prineville Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Prineville Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Prineville Reservoir today is 20.7°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 |
|---|---|---|---|
| AUG 4 | 21.2°C | 20.0°C | |
| AUG 5 | 21.3°C | 20.0°C | |
| AUG 6 | 20.9°C | 20.0°C | |
| AUG 7 | 20.0°C | 20.0°C | |
| AUG 8 | 20.0°C | 20.0°C | |
| AUG 9 | 20.5°C | 20.0°C | |
| AUG 10 | 22.0°C | 20.0°C | |
| AUG 11 | 22.3°C | 20.0°C | |
| AUG 12 | 20.0°C | 20.7°C | |
| AUG 13 | 20.0°C | 20.6°C | |
| AUG 14 | 20.0°C | 20.6°C | |
| AUG 15 | 20.0°C | 20.6°C | |
| AUG 16 | 20.0°C | 20.5°C | |
| AUG 17 | 20.0°C | 20.5°C | |
| AUG 18 | 20.0°C | 20.5°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 | 5°C |
| February | 2°C | 5°C | 8°C |
| March | 0°C | 4°C | 8°C |
| April | 5°C | 8°C | 11°C |
| May | 8°C | 13°C | 17°C |
| June | 9°C | 15°C | 21°C |
| July | 13°C | 17°C | 22°C |
| August | 16°C | 20°C | 24°C |
| September | 13°C | 17°C | 21°C |
| October | 6°C | 10°C | 14°C |
| November | 3°C | 6°C | 9°C |
| December | 0°C | 3°C | 7°C |
Prineville Reservoir: Water Temperature by Location
Prineville Reservoir: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Lake of Prineville Reservoir shows pronounced seasonal variation in surface water temperature because it sits in a high-desert climate and stratifies in the summer. Typical spring temperatures run roughly 45–60°F (7–16°C) as snowmelt and runoff cool the lake. During summer the surface commonly warms to about 65–80°F (18–27°C) on sunny days, with the warmest readings in July and August; deeper water remains much colder. In fall the surface usually drops back to roughly 55–65°F (13–18°C) as air temperatures cool, and winter temperatures can fall to the mid-30s to mid-40s °F (2–7°C) where ice and cold inflows influence conditions. These figures are approximate and vary with weather, depth, and location around the reservoir.
Swimming at Lake of Prineville Reservoir is permitted in recreation areas and from beaches and shorelines, but it is largely unguarded and subject to posted rules. The combination of cold water below the surface, boat traffic, sudden drop-offs, and occasional algal or debris issues means swimmers should exercise caution; wearing a personal flotation device, staying near shore, and checking current conditions are recommended. Local management maintains day-use facilities and signage, so visitors should follow those guidelines to ensure a safe swimming experience.