The Mont-Blanc glaciers, just over an hour from Geneva, are melting a month ahead of schedule after a low-snow winter and June's record heatwave.
The Chamonix Guides president Olivier Greber says he has never seen the mountains this dry in early July.
High-altitude guides are already facing fewer viable routes, with rockfalls multiplying and the freezing level climbing past 4,000 metres.
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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
