If you planning to travel to St.Leonard Underground Lake, Saint-Léonard, Switzerland, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 6:11 AM. The temperature feels like 47.95 with a humidity level of 57 so dress accordingly. Cloud coverage is 7 percent with visibility at 14.9 percent. Today’s UV index is 3, don’t forget the sunscreen if you need it! Today’s winds are traveling east-southeast at a speed of 3 MPH. At the end of the day don’t miss the sunset at 4:13 PM.