Delavan Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Delavan Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Delavan Lake today is 21.3°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 2 | 18.9°C | 18.6°C | |
| JUN 3 | 19.0°C | 18.6°C | |
| JUN 4 | 19.1°C | 18.6°C | |
| JUN 5 | 19.2°C | 18.6°C | |
| JUN 6 | 19.4°C | 18.6°C | |
| JUN 7 | 20.1°C | 18.6°C | |
| JUN 8 | 21.1°C | 18.6°C | |
| JUN 10 | 18.6°C | 21.2°C | |
| JUN 11 | 18.6°C | 21.0°C | |
| JUN 12 | 18.6°C | 20.9°C | |
| JUN 13 | 18.6°C | 20.8°C | |
| JUN 14 | 18.6°C | 20.6°C | |
| JUN 15 | 18.6°C | 20.5°C | |
| JUN 16 | 18.6°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 | 0°C | 3°C | 6°C |
| March | 1°C | 5°C | 8°C |
| April | 5°C | 9°C | 14°C |
| May | 8°C | 13°C | 19°C |
| June | 16°C | 19°C | 22°C |
| July | 21°C | 25°C | 29°C |
| August | 22°C | 25°C | 27°C |
| September | 18°C | 20°C | 22°C |
| October | 13°C | 17°C | 20°C |
| November | 3°C | 9°C | 15°C |
| December | 0°C | 3°C | 6°C |
Delavan Lake: Water Temperature by Location
Delavan Lake: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Delavan Lake in southeastern Wisconsin experiences marked seasonal shifts in water temperature that influence swimming conditions. In spring, surface temperatures typically range from roughly 40–60°F (4–16°C) as the lake warms after ice-off, which is generally too cool for comfortable extended swimming. Summer months are when the lake is most inviting: surface temperatures commonly reach about 70–80°F (21–27°C), with the warmest weeks occasionally pushing a few degrees higher in shallow, sheltered areas. Early fall sees a gradual cooling to roughly 50–65°F (10–18°C) as the lake releases summer heat. In winter the surface often approaches freezing, around 32–40°F (0–4°C), and significant ice cover can develop.
Swimming at Delavan Lake is generally permitted and is popular during the warm months because it is a freshwater lake with public and private access points and designated beach areas. However, safety and usability vary: water that is too cold limits safe exposure times outside mid-summer, and local health advisories or algal bloom warnings can temporarily close beaches. In winter, open-water swimming is uncommon and potentially hazardous unless part of an organized, properly supervised event with safety measures in place. Checking current conditions and postings before entering the water is recommended.