John Redmond Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in John Redmond Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in John Redmond Reservoir today is 22.9°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 | 24.4°C | 23.3°C | |
| SEP 15 | 23.4°C | 23.3°C | |
| SEP 16 | 23.4°C | 23.3°C | |
| SEP 17 | 23.2°C | 23.3°C | |
| SEP 18 | 23.6°C | 23.3°C | |
| SEP 19 | 22.0°C | 23.3°C | |
| SEP 20 | 22.9°C | 23.3°C | |
| SEP 21 | 22.9°C | 23.3°C | |
| SEP 22 | 23.3°C | 22.9°C | |
| SEP 23 | 23.3°C | 22.9°C | |
| SEP 24 | 23.3°C | 23.0°C | |
| SEP 25 | 23.3°C | 23.0°C | |
| SEP 26 | 23.3°C | 23.0°C | |
| SEP 27 | 23.3°C | 23.0°C | |
| SEP 28 | 23.3°C | 23.0°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 | 0°C | 4°C | 8°C |
| March | 1°C | 8°C | 15°C |
| April | 9°C | 14°C | 19°C |
| May | 13°C | 18°C | 23°C |
| June | 18°C | 21°C | 25°C |
| July | 24°C | 28°C | 31°C |
| August | 23°C | 27°C | 31°C |
| September | 19°C | 23°C | 28°C |
| October | 16°C | 19°C | 22°C |
| November | 8°C | 12°C | 16°C |
| December | 3°C | 6°C | 9°C |
John Redmond Reservoir: Water Temperature by Location
John Redmond Reservoir: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
John Redmond Reservoir’s surface water temperatures change substantially through the year. In spring (March–May) surface readings typically range from about 45–65°F (7–18°C) as the lake warms after winter. By summer (June–August) the upper layers commonly reach 70–85°F (21–29°C), and during hot spells can edge higher at the surface. Fall (September–November) sees a gradual cooling to roughly 55–70°F (13–21°C) before winter, when surface temperatures often fall to about 33–45°F (1–7°C). These are typical surface values; deeper water remains colder year-round and temperature can vary with weather, wind and reservoir operations.
Swimming is generally permitted at John Redmond for recreational use, but usually only in designated or commonly used shoreline areas and typically at the swimmer’s own risk, because official lifeguards are not routinely provided. Authorities can close parts of the reservoir or post advisories for safety reasons such as strong currents, fluctuating water levels, debris, poor visibility, or water-quality issues including elevated bacteria or blue‑green algal blooms. Because of the seasonal temperature swings, summer offers the most comfortable swimming conditions, spring and fall can be brisk, and winter swimming poses hypothermia risks. Visitors should check current advisories and exercise caution.