Caldron Falls Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Caldron Falls Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Caldron Falls 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 |
|---|---|---|---|
| JUN 3 | 18.4°C | 19.5°C | |
| JUN 4 | 18.5°C | 19.5°C | |
| JUN 5 | 18.7°C | 19.5°C | |
| JUN 6 | 18.7°C | 19.5°C | |
| JUN 7 | 19.8°C | 19.5°C | |
| JUN 8 | 20.1°C | 19.5°C | |
| JUN 11 | 19.5°C | 20.8°C | |
| JUN 12 | 19.5°C | 20.8°C | |
| JUN 13 | 19.5°C | 20.7°C | |
| JUN 14 | 19.5°C | 20.6°C | |
| JUN 15 | 19.5°C | 20.6°C | |
| JUN 16 | 19.5°C | 20.5°C | |
| JUN 17 | 19.5°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 | 4°C | 7°C |
| February | 0°C | 4°C | 8°C |
| March | 0°C | 3°C | 5°C |
| April | 0°C | 6°C | 12°C |
| May | 6°C | 15°C | 23°C |
| June | 17°C | 20°C | 22°C |
| July | 18°C | 22°C | 25°C |
| August | 18°C | 23°C | 27°C |
| September | 12°C | 15°C | 18°C |
| October | 13°C | 16°C | 18°C |
| November | 0°C | 7°C | 14°C |
| December | 0°C | 2°C | 5°C |
Caldron Falls Reservoir: Water Temperature by Location
Caldron Falls Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Caldron Falls Reservoir, like many inland reservoirs in northern Wisconsin, experiences a wide seasonal swing in water temperature. In spring the water is cold, often ranging from the low 30s to mid 50s °F (around 0–13 °C) as snowmelt and cool inflows dominate. By summer the surface can warm substantially, typically reaching the mid 60s to upper 70s °F (about 18–26 °C) on warm, calm days, with the warmest surface temperatures in July and August. In fall temperatures decline again into the 40s–50s °F (5–15 °C) as air cools and mixing increases, and in winter the reservoir commonly approaches freezing with ice cover in many years, keeping water close to 32–34 °F (0–1 °C) beneath the ice.
Swimming opportunities at Caldron Falls Reservoir depend on local access, signage, and seasonal conditions. Many reservoirs in the region are used recreationally for swimming where shore access or public beaches exist, but restrictions often apply near dams, spillways, or private property for safety and operational reasons. Cold water, sudden drop-offs, submerged hazards, boat traffic and potential algal blooms are factors that can limit safe swimming; during summer months, however, surface temperatures frequently become comfortable enough for casual swimming in permitted areas. Visitors should follow posted rules and local guidance before entering the water.