In the middle of July, it is usually summer in the Engadin Valley with day time temperatures of around 20 degrees C. However, the valley floor is at 1700 meters above sea level and this means that there could even be snowfall.
Water temperatures will be between 10 – 14 degrees C depending on where along the course. Make sure you dress accordingly and consider wearing something under your wetsuit if you tend to get cold on the long swims. Use a Neoprene cap if you are not used to cold water.
Like everywhere we can have wind, rain and un-seasonably cold weather. Make sure you bring clothes to handle this.