Flood alerts are in place in several areas around the country.
Heavy rain and melting snow is expected to flow into the rivers and lakes raising levels.
The government has raised the alert levels from 2 to 5 on the plateau and around the Jura.
The rivers which are being watched most closely are the Arve in Geneva, the Aare around Biel and Bern as well as sections of the Rhine, the Emme and Thur.
Warmer temperatures are expected in the mountains, the snow line rising to 2,000 meters.
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Copernicus reports hottest summer ever measured
Switzerland is in the grip of a level 3 heat alert, with Geneva heading for temperatures of up to 36°C on Friday.
Tough new banking rules possible
The Federal Council has launched consultations on new banking rules that could withhold or claw back bonuses from top banking executives.
Speed crackdown affects all of Switzerland
The Federal Council has tightened the rules for imposing 30 km/h zones on city streets, requiring cantons to prove that a slowdown will not push traffic into residential neighbourhoods
Back to school concern over heat
Vaud is preparing to map every school building in the canton to identify the classrooms most vulnerable to extreme heat
Eye warning for eclipse watchers
Anyone who watched Wednesday's solar eclipse without proper glasses should watch for signs of retinal damage, doctors are warning
