Deadmans Basin Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Deadmans Basin Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Deadmans Basin Reservoir today is 25.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 | 22.8°C | 20.6°C | |
| JUL 15 | 26.3°C | 20.6°C | |
| JUL 16 | 24.7°C | 20.6°C | |
| JUL 17 | 24.8°C | 20.6°C | |
| JUL 18 | 25.1°C | 20.6°C | |
| JUL 19 | 25.2°C | 20.6°C | |
| JUL 20 | 25.1°C | 20.6°C | |
| JUL 21 | 25.0°C | 20.6°C | |
| JUL 22 | 20.6°C | 24.9°C | |
| JUL 23 | 20.6°C | 24.7°C | |
| JUL 24 | 20.6°C | 24.4°C | |
| JUL 25 | 20.6°C | 24.2°C | |
| JUL 26 | 20.6°C | 24.0°C | |
| JUL 27 | 20.6°C | 23.8°C | |
| JUL 28 | 20.6°C | 23.5°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 | 4°C | 6°C |
| February | 1°C | 4°C | 7°C |
| March | 1°C | 5°C | 9°C |
| April | 0°C | 6°C | 12°C |
| May | 4°C | 11°C | 18°C |
| June | 9°C | 14°C | 19°C |
| July | 15°C | 21°C | 27°C |
| August | 17°C | 19°C | 22°C |
| September | 13°C | 16°C | 19°C |
| October | 4°C | 11°C | 17°C |
| November | 2°C | 7°C | 11°C |
| December | 2°C | 5°C | 7°C |
Deadmans Basin Reservoir: Water Temperature by Location
Deadmans Basin Reservoir: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Deadmans Basin Reservoir in Montana typically has cold water year-round, with surface temperatures varying by season and by depth. In summer the surface commonly warms to roughly 55–70°F (13–21°C) on warm afternoons, though deeper water remains much colder. During spring melt and into early fall surface temperatures are often in the 40–55°F range (4–13°C). In winter the reservoir approaches freezing conditions, with surface temperatures near 32–39°F (0–4°C) and ice cover possible at higher elevations. Like many reservoirs, it stratifies in summer so temperatures drop sharply below the surface, and localized shallow bays can be a few degrees warmer than the main basin.
Swimming opportunities depend on management, access and safety rather than water temperature alone. Recreational swimming is commonly possible where the reservoir and shoreline are managed for public use, but specific areas may be restricted because of dam operations, water-quality concerns, private land, or seasonal hazards. Even where allowed, the cold water poses risks of cold shock and hypothermia and submerged hazards and boat traffic can make swimming unsafe. Visitors should check local regulations and signage, use caution around sudden drop-offs, and limit time in the water to reduce cold-related risks.