Clark Canyon Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Clark Canyon Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Clark Canyon Reservoir today is 22.4°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 |
|---|---|---|---|
| JUL 14 | 20.5°C | 17.1°C | |
| JUL 15 | 22.2°C | 17.1°C | |
| JUL 16 | 22.0°C | 17.1°C | |
| JUL 17 | 22.0°C | 17.1°C | |
| JUL 18 | 22.2°C | 17.1°C | |
| JUL 19 | 22.6°C | 17.1°C | |
| JUL 20 | 22.3°C | 17.1°C | |
| JUL 21 | 22.4°C | 17.1°C | |
| JUL 22 | 17.1°C | 22.1°C | |
| JUL 23 | 17.1°C | 21.9°C | |
| JUL 24 | 17.1°C | 21.6°C | |
| JUL 25 | 17.1°C | 21.3°C | |
| JUL 26 | 17.1°C | 21.1°C | |
| JUL 27 | 17.1°C | 20.8°C | |
| JUL 28 | 17.1°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 | 1°C | 4°C | 6°C |
| February | 2°C | 5°C | 7°C |
| March | 2°C | 6°C | 9°C |
| April | 0°C | 4°C | 9°C |
| May | 4°C | 10°C | 16°C |
| June | 9°C | 14°C | 18°C |
| July | 12°C | 17°C | 23°C |
| August | 17°C | 19°C | 22°C |
| September | 13°C | 17°C | 20°C |
| October | 4°C | 9°C | 14°C |
| November | 1°C | 6°C | 10°C |
| December | 3°C | 7°C | 10°C |
Clark Canyon Reservoir: Water Temperature by Location
Clark Canyon Reservoir: Weather Forecast
July 22
July 23
July 24
July 25
Location & Local Information
Clark Canyon Reservoir is a high-elevation impoundment in southwestern Montana, so its water stays relatively cool for much of the year. In spring (April–May) surface temperatures commonly range from about 35–55°F (2–13°C) as snowmelt and cooler air dominate. By summer (June–August) the surface often warms to roughly 60–70°F (15–21°C), and on the warmest, calmest afternoons can occasionally reach the low 70s°F (22–23°C). In early fall (September–October) temperatures typically fall back into the 50s–60s°F (10–16°C) range, while winter conditions bring near-freezing water and frequent ice cover around 32°F (0°C), especially in shallow bays.
Swimming is permitted in the reservoir because it is a publicly managed recreation area with access points and shoreline open for use, but it is not supervised with lifeguards and conditions can be hazardous. Cold-water shock and rapid heat loss are real risks even in summer where surface warmth masks colder depths, and fluctuating reservoir levels, boat traffic, submerged structures and occasional strong currents near the dam make caution important. If you choose to swim, do so from established access sites, be aware of water temperature and weather, never swim alone, and consider a wetsuit or flotation device in cooler conditions.