Lake Geneva — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Geneva, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Geneva today is 29.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating. 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 | 24.0°C | 24.7°C | |
| JUL 15 | 26.1°C | 24.7°C | |
| JUL 16 | 26.2°C | 24.7°C | |
| JUL 17 | 26.3°C | 24.7°C | |
| JUL 18 | 26.3°C | 24.7°C | |
| JUL 19 | 26.3°C | 24.7°C | |
| JUL 20 | 27.4°C | 24.7°C | |
| JUL 21 | 28.4°C | 24.7°C | |
| JUL 22 | 24.7°C | 29.1°C | |
| JUL 23 | 24.7°C | 28.8°C | |
| JUL 24 | 24.7°C | 28.6°C | |
| JUL 25 | 24.7°C | 28.4°C | |
| JUL 26 | 24.7°C | 28.2°C | |
| JUL 27 | 24.7°C | 27.9°C | |
| JUL 28 | 24.7°C | 27.7°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 | 6°C |
| February | 0°C | 3°C | 6°C |
| March | 1°C | 5°C | 8°C |
| April | 5°C | 9°C | 13°C |
| May | 9°C | 14°C | 19°C |
| June | 15°C | 19°C | 23°C |
| July | 20°C | 25°C | 30°C |
| August | 22°C | 25°C | 27°C |
| September | 17°C | 20°C | 22°C |
| October | 13°C | 17°C | 20°C |
| November | 3°C | 7°C | 11°C |
| December | 0°C | 4°C | 8°C |
Lake Geneva: Water Temperature by Location
Lake Geneva: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Lake Geneva in Wisconsin experiences a wide range of water temperatures through the year. In winter the lake commonly has surface readings near freezing, about 32–40°F (0–4°C) when open water exists and often ice cover develops. Spring temperatures typically climb from roughly 40–60°F (4–15°C) as the lake stratifies and thaws. The warmest period is summer, with surface temperatures most often in the 70–80°F range (21–27°C) and occasionally reaching the mid‑80s (around 29°C) on hot, calm days. By autumn the water cools again to roughly 50–65°F (10–18°C) as heat loss increases and turnover begins.
Swimming in Lake Geneva is permitted and commonly practiced during the warmer months at public beaches and park swim areas, where lifeguards and designated swimming zones are provided for safety. Restrictions are typically seasonal: water-based recreation is discouraged or prohibited when the lake is ice‑covered or during official water‑quality advisories. Local health departments monitor bacterial counts and harmful algal blooms and will issue short‑term advisories if conditions pose risks. Even when temperatures are comfortable, swimmers should heed posted signs and local guidance for safety and water‑quality updates.