Ascona — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Ascona, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Ascona today is 20°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 |
|---|---|---|---|
| JUN 3 | 19.9°C | 15.5°C | |
| JUN 4 | 19.5°C | 15.5°C | |
| JUN 5 | 19.5°C | 15.5°C | |
| JUN 6 | 19.5°C | 15.5°C | |
| JUN 7 | 19.5°C | 15.5°C | |
| JUN 8 | 19.4°C | 15.5°C | |
| JUN 10 | 19.9°C | 15.5°C | |
| JUN 11 | 15.5°C | 19.8°C | |
| JUN 12 | 15.5°C | 19.6°C | |
| JUN 13 | 15.5°C | 19.3°C | |
| JUN 14 | 15.5°C | 19.1°C | |
| JUN 15 | 15.5°C | 18.9°C | |
| JUN 16 | 15.5°C | 18.7°C | |
| JUN 17 | 15.5°C | 18.4°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 | 3°C | 6°C | 10°C |
| February | 3°C | 6°C | 10°C |
| March | 4°C | 7°C | 10°C |
| April | 5°C | 10°C | 16°C |
| May | 6°C | 13°C | 21°C |
| June | 8°C | 16°C | 23°C |
| July | 9°C | 17°C | 24°C |
| August | 11°C | 18°C | 25°C |
| September | 10°C | 16°C | 21°C |
| October | 7°C | 12°C | 17°C |
| November | 5°C | 10°C | 14°C |
| December | 3°C | 6°C | 10°C |
Ascona: Weather Forecast
June 9
June 10
June 11
June 12
June 13
June 14
Location & Local Information
Ascona lies on the northern shore of Lake Maggiore and enjoys one of the mildest climates in Switzerland. The lake’s water temperature changes gradually through the year. In winter, it usually cools to about 6–8 °C (43–46 °F). During spring, warming accelerates and temperatures typically reach around 14–18 °C (57–64 °F). Summer brings the most pleasant conditions, with July and August surface temperatures commonly ranging from 22–26 °C (72–79 °F). In autumn, the lake retains heat well and often stays above 18 °C (64 °F) well into September and early October.
Swimming in Lake Maggiore at Ascona is fully allowed and very popular. The lake has calm waters, good water quality, and numerous public lidos and accessible shore areas. Thanks to its size and depth, the lake warms slowly but also cools slowly, extending the swimming season compared to most Swiss lakes. Summer offers comfortable conditions for all swimmers, while late spring and early autumn remain suitable for those tolerant of slightly cooler water.