Boysen Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Boysen Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Boysen Reservoir today is 8.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing can be used. 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 |
|---|---|---|---|
| APR 11 | 9.1°C | 5.1°C | |
| APR 12 | 9.9°C | 5.1°C | |
| APR 13 | 10.0°C | 5.1°C | |
| APR 14 | 10.0°C | 5.1°C | |
| APR 15 | 10.2°C | 5.1°C | |
| APR 16 | 10.0°C | 5.1°C | |
| APR 17 | 10.3°C | 5.1°C | |
| APR 18 | 10.1°C | 5.1°C | |
| APR 19 | 5.1°C | 8.7°C | |
| APR 20 | 5.1°C | 8.5°C | |
| APR 21 | 5.1°C | 8.3°C | |
| APR 22 | 5.1°C | 8.1°C | |
| APR 23 | 5.1°C | 8.0°C | |
| APR 24 | 5.1°C | 7.8°C | |
| APR 25 | 5.1°C | 7.6°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 | 5°C |
| February | 1°C | 4°C | 7°C |
| March | 1°C | 6°C | 11°C |
| April | 0°C | 5°C | 11°C |
| May | 4°C | 9°C | 14°C |
| June | 11°C | 15°C | 19°C |
| July | 16°C | 19°C | 22°C |
| August | 18°C | 21°C | 23°C |
| September | 14°C | 17°C | 20°C |
| October | 7°C | 12°C | 16°C |
| November | 4°C | 7°C | 9°C |
| December | 2°C | 4°C | 7°C |
Boysen Reservoir: Water Temperature by Location
Boysen Reservoir: Weather Forecast
April 18
April 19
April 20
April 21
April 22
April 23
Location & Local Information
Boysen Reservoir in central Wyoming experiences a wide seasonal swing in water temperature. In spring the surface water typically runs cool, roughly 40–55°F (4–13°C) as runoff and snowmelt dominate. By early summer temperatures commonly climb into the mid-50s to high-60s °F (13–20°C), and at the warmest points of July and August the surface can reach about 60–75°F (16–24°C) in sheltered areas. As autumn arrives the lake cools again, often falling to the 45–60°F range (7–16°C). In winter much of the reservoir can approach freezing, generally around 32–40°F (0–4°C) where ice forms, while deeper water remains just above freezing.
Swimming at Boysen is generally permitted because the reservoir and adjacent lands are managed for multiple recreational uses, including bathing, boating, and fishing. However, swimmers should be cautious: even in summer the water can be cool enough to cause cold-water shock and cramps, boat traffic and wind-driven waves create hazards, and there are submerged structures and sudden drop-offs in some areas. Areas immediately around the dam and some launch zones may be restricted, and lifeguards are uncommon, so personal flotation devices and conservative judgment are recommended.