Butt Valley Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Butt Valley Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Butt Valley Reservoir today is 17.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 17 | 18.8°C | 22.0°C | |
| SEP 18 | 18.8°C | 22.0°C | |
| SEP 19 | 18.8°C | 22.0°C | |
| SEP 20 | 17.7°C | 22.0°C | |
| SEP 21 | 17.6°C | 22.0°C | |
| SEP 22 | 17.7°C | 22.0°C | |
| SEP 23 | 18.2°C | 22.0°C | |
| SEP 24 | 17.6°C | 22.0°C | |
| SEP 25 | 22.0°C | 17.5°C | |
| SEP 26 | 22.0°C | 17.4°C | |
| SEP 27 | 22.0°C | 17.3°C | |
| SEP 28 | 22.0°C | 17.2°C | |
| SEP 29 | 22.0°C | 17.1°C | |
| SEP 30 | 22.0°C | 17.0°C | |
| OCT 1 | 15.5°C | 16.9°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 | 2°C | 10°C | 18°C |
| February | 2°C | 10°C | 17°C |
| March | 3°C | 12°C | 21°C |
| April | 5°C | 13°C | 21°C |
| May | 10°C | 16°C | 21°C |
| June | 15°C | 18°C | 22°C |
| July | 19°C | 23°C | 27°C |
| August | 19°C | 23°C | 27°C |
| September | 19°C | 22°C | 25°C |
| October | 12°C | 16°C | 19°C |
| November | 7°C | 13°C | 19°C |
| December | 5°C | 9°C | 12°C |
Butt Valley Reservoir: Water Temperature by Location
Butt Valley Reservoir: Weather Forecast
September 25
September 26
September 27
September 28
September 29
Location & Local Information
Butt Valley Reservoir’s water temperatures change a lot through the year because it is a relatively deep, mountain-fed reservoir. In summer the surface often warms into the low 60s to low 70s °F (about 15–22 °C) on sunny days, though cooler conditions are common after long cloudy spells. During spring and fall the surface typically ranges from the mid‑40s to mid‑60s °F (roughly 7–18 °C) as snowmelt and rain influence inflows. In winter the water hangs colder, frequently in the upper 30s to around 50 °F (about 4–10 °C). Deeper water remains substantially colder year‑round, and temperatures can vary with recent weather, wind, and reservoir release schedules.
Swimming at Butt Valley is generally considered a recreational activity in appropriate areas, but access and rules can be limited for safety and resource reasons. Restrictions may be posted because of strong currents near dam outlets, cold-water shock risk, water quality concerns, or operational needs, and lifeguards are not always provided. Visitors should check current management rules before entering the water and be mindful that even in summer the reservoir can feel quite chilly below the surface, making flotation devices, wetsuits, and caution advisable.