The Bellerive swimming pool in Lausanne, where a young man jumps from the three-metre diving board. (Keystone/Dominic Favre)
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Lake Lucerne at Bauen, a place where those hungry for the sun enjoy a summer's day. (Keystone Urs Flüeler)
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A sunny day at the public swimming pool "Bains de Paquis" in Geneva. (Keystone/Magali Giaradin)
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Summer near Gunten on Lake Thun. (Keystone/Walter Bieri)
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Janusa cools down in the water fountain at the Place de la Navigation in Ouchy near Lausanne. (Keystone/Christian Brun)
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Off into the River Aare in Bern in August 2009. (Keystone/Lukas Lehmann)
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Sprinkling a flowerbed near the lake of Zug in 2006. (Keystone/Alessandro Della Bella)
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Thousands of people swim at the end of the day in the River Aare in Bern. (Keystone/Lukas Lehmann)
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Watering fields by night in an area near St Gallen in 2006. (Keystone/Eddy Risch)
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A man enjoys one of the last days of summer at Lake Zurich. (Keystone/Walter Bieri)
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Enjoying a ride down a water slide at a swimming pool near Geneva, where the temperature was more than 30 degrees Celsius. (Keystone/Martial Trezzini)
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A novel way to enjoy a fondue in summer. Eat it in the fountain. This photo was taken at Pratteln near Basel. (Keystone/Markus Stücklin)
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Katja takes a refreshing dip in a fountain in Zurich in 2010. (Keystone/Alessandro Della Bella)
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Ferpecle glacier in the Val d'Hérens in canton Valais. The melting was giving rise for concern in 2003. (Keystone/Alessandro Della Bella)
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A cool shower at the Street Parade in Zurich. (Keystone/Eddy Risch)
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Jumping from the Quaibrücke in Zurich at the end of summer, 2010. (Keystone/Walter Bieri)
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A busy swimming pool at Teufen in canton Appenzell Ausser Rhodes. (Keystone/Gaetan Bally)
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Katharina, wearing a 1910 swimsuit, Erich and Gerharda (right to left), enjoy a bath in an old wooden tub on the patio of the historic pharmaceutical museum in Basel. The museum was offering a medieval bath splash during lunch hours in the hot days of summer 2003. (Keystone/Markus Stücklin)
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Swimmers between the pine trees which border the small lake "étang de la Gruère" near Saignelégier in canton Jura. The lake and its surrounding moor have been turned into a nature reserve. (Keystone/ Martin Rütschi)
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Enjoying the evening at Rorschach on Lake Constance. (Keystone/Ennio Leanza)
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The astronomical summer began on June 21, time to go swimming.
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Summer, according to astronomers, starts on June 21 at 7.16pm and ends on September 23 at 11.05am. It therefore lasts 93 days, 15 hours and 48 minutes. Summer is the longest season and is five days longer than winter. Switzerland offers plenty of opportunities to cool down in lakes and rivers and enjoy it.
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