Diamond Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Diamond Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Diamond Lake today is 14.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 13 | 15.9°C | 18.8°C | |
| SEP 14 | 16.9°C | 18.8°C | |
| SEP 15 | 15.8°C | 18.8°C | |
| SEP 16 | 15.3°C | 18.8°C | |
| SEP 17 | 15.6°C | 18.8°C | |
| SEP 18 | 15.7°C | 18.8°C | |
| SEP 19 | 15.5°C | 18.8°C | |
| SEP 20 | 14.8°C | 18.8°C | |
| SEP 21 | 18.8°C | 14.8°C | |
| SEP 22 | 18.8°C | 15.0°C | |
| SEP 23 | 18.8°C | 15.2°C | |
| SEP 24 | 18.8°C | 15.4°C | |
| SEP 25 | 18.8°C | 15.7°C | |
| SEP 26 | 18.8°C | 15.9°C | |
| SEP 27 | 18.8°C | 16.1°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 | 4°C |
| February | 0°C | 1°C | 3°C |
| March | 1°C | 4°C | 7°C |
| April | 3°C | 9°C | 15°C |
| May | 5°C | 13°C | 21°C |
| June | 9°C | 16°C | 23°C |
| July | 13°C | 20°C | 26°C |
| August | 15°C | 21°C | 27°C |
| September | 15°C | 19°C | 22°C |
| October | 9°C | 13°C | 17°C |
| November | 0°C | 5°C | 10°C |
| December | 0°C | 2°C | 4°C |
Diamond Lake: Water Temperature by Location
Diamond Lake: Weather Forecast
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Diamond Lake, a high-elevation body of water in Oregon’s Cascade Range, stays relatively cool year-round. Typical surface temperatures in winter hover around freezing where ice can form, roughly 32°F (0°C) and sometimes slightly below at isolated spots. In spring and early summer the lake usually warms into the 40s to mid-50s°F (4–13°C) as snowmelt continues to influence inflows. Peak summer surface readings commonly range from about 55 to 68°F (13–20°C) on warm afternoons, though deeper water remains colder. By fall the surface generally cools back into the 40s to low 50s°F (4–11°C) as air temperatures drop and daylight shortens.
Swimming at Diamond Lake is permitted because the area is a designated recreational site with public beaches and access points, but it is not heavily supervised. Many visitors swim or wade in summer when surface temperatures are at their warmest, yet even then the cold water can produce rapid chilling and increase the risk of cold-water shock and hypothermia. There are usually no lifeguards, so swimmers should exercise caution, limit time in the water, wear flotation if venturing farther from shore, and check local advisories for temporary closures or safety notices before entering.