Deadwood Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Deadwood Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Deadwood Reservoir today is 20.9°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 |
|---|---|---|---|
| AUG 24 | 23.3°C | 22.8°C | |
| AUG 25 | 23.4°C | 22.8°C | |
| AUG 26 | 23.4°C | 22.8°C | |
| AUG 27 | 21.5°C | 22.8°C | |
| AUG 28 | 21.3°C | 22.8°C | |
| AUG 29 | 21.3°C | 22.8°C | |
| AUG 30 | 21.3°C | 22.8°C | |
| AUG 31 | 20.9°C | 22.8°C | |
| SEP 1 | 19.4°C | 20.8°C | |
| SEP 2 | 19.4°C | 20.8°C | |
| SEP 3 | 19.4°C | 20.7°C | |
| SEP 4 | 19.4°C | 20.6°C | |
| SEP 5 | 19.4°C | 20.5°C | |
| SEP 6 | 19.4°C | 20.5°C | |
| SEP 7 | 19.4°C | 20.4°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 | 1°C | 3°C | 6°C |
| March | 3°C | 5°C | 7°C |
| April | 0°C | 4°C | 8°C |
| May | 3°C | 9°C | 15°C |
| June | 10°C | 15°C | 19°C |
| July | 15°C | 20°C | 25°C |
| August | 20°C | 23°C | 25°C |
| September | 17°C | 19°C | 22°C |
| October | 8°C | 13°C | 18°C |
| November | 3°C | 7°C | 9°C |
| December | 0°C | 2°C | 5°C |
Deadwood Reservoir: Water Temperature by Location
Deadwood Reservoir: Weather Forecast
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September 6
Location & Local Information
Deadwood Reservoir, a high-elevation impoundment in central Idaho, tends to run cool for much of the year. Surface temperatures in spring commonly sit between about 40–55°F (4–13°C) as snowmelt and cool inflows dominate. By early to mid-summer the surface usually warms to roughly 60–70°F (16–21°C), with the warmest days occasionally pushing into the low 70s°F (around 22–24°C). Fall sees a steady decline back toward 45–60°F (7–16°C), and winter conditions bring near‑freezing water and often ice cover, roughly 32–39°F (0–4°C). Deeper water remains substantially colder year‑round and thermoclines can make temperature changes abrupt with depth.
Swimming at Deadwood Reservoir is generally permitted because the area is managed for multiple recreational uses, including boating, camping and shoreline access. However, swimmers should be aware that even summer surface temperatures can feel chilly compared with lowland lakes, and cold water, sudden drop-offs, submerged timber, and limited lifeguard presence increase risk. For comfort and safety many people use wetsuits for longer swims, wear personal flotation devices when boating, and limit swimming to calm, well‑visible areas. Always check current local advisories and conditions before entering the water.