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 18.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| SEP 14 | 20.7°C | 21.3°C | |
| SEP 15 | 20.4°C | 21.3°C | |
| SEP 16 | 19.6°C | 21.3°C | |
| SEP 17 | 18.7°C | 21.3°C | |
| SEP 18 | 17.9°C | 21.3°C | |
| SEP 19 | 18.2°C | 21.3°C | |
| SEP 20 | 17.9°C | 21.3°C | |
| SEP 21 | 18.2°C | 21.3°C | |
| SEP 22 | 21.3°C | 18.4°C | |
| SEP 23 | 21.3°C | 18.5°C | |
| SEP 24 | 21.3°C | 18.7°C | |
| SEP 25 | 21.3°C | 18.8°C | |
| SEP 26 | 21.3°C | 19.0°C | |
| SEP 27 | 21.3°C | 19.1°C | |
| SEP 28 | 21.3°C | 19.3°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 | 1°C | 7°C | 12°C |
| February | 3°C | 9°C | 15°C |
| March | 0°C | 9°C | 17°C |
| April | 2°C | 11°C | 20°C |
| May | 5°C | 13°C | 21°C |
| June | 14°C | 19°C | 24°C |
| July | 17°C | 22°C | 27°C |
| August | 21°C | 25°C | 28°C |
| September | 17°C | 21°C | 26°C |
| October | 5°C | 12°C | 18°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 5°C | 8°C |
Lake Geneva: Water Temperature by Location
Lake Geneva: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Lake Geneva in Minnesota experiences the typical seasonal swings of a temperate inland lake. In spring the surface often runs cool, roughly 40–60°F (4–16°C) as the lake stratifies, while summer brings the warmest conditions with surface temperatures commonly in the 68–78°F range (20–26°C), occasionally rising toward 80°F (27°C) in heat spells. By autumn the water cools back toward 50–60°F (10–16°C) and then approaches freezing in winter, with surface ice and temperatures near 32°F (0°C) or lower. Deeper parts of the lake remain noticeably colder year‑round, so readings can vary by depth, weather and lake clarity.
Swimming is generally permitted and most comfortable during the warm summer months when surface temperatures are highest; many recreational beaches and private shorelines allow swimming when conditions are safe. However, local health advisories, boating activity, and the occasional harmful algal bloom or bacterial contamination can lead to temporary restrictions, so checking current notices before entering the water is wise. Winter swimming is not recommended for casual visitors because of ice and hypothermia risk, and any cold‑water or ice‑swimming should only be done with appropriate safety measures and local guidance.