A 50 year-old-foreign man, died in the Saas Fee region of the canton of Valais while climbing the Taschhorn on Saturday around 2:15pm.
The unidentified person fell 150 metres from an altitude of 4,040 metres.
According to the police, the man was descending down the mountain with a colleague, and the two climbers were not roped together.
Another unidentified person who was climbing in the Gspaltenhorn region of the Bernese Oberland on Saturday also died.
On Saturday another death was reported when a 29-year-old German man died. He fell 300 metres during a mountain race in the Girenspitz area of the canton of Saint Gallen.
Police have started an investigation into the exact circumstances of the accident.
In an another tragic accident, a Swiss man died at the age of 53 on Saturday, while hiking with a group of seven people on Mount Pilatus in Central Switzerland. He felt 35 metres down a rock wall.
The same day, 52-year-old woman who was walking on the Dents de Lays lost her balance and fell 80 metres.
A Swiss man fell 1,000 metres down the Matterhorn, and a German died after falling 200 metres, the same day, on the Weissmies mountain.
The body of a man who had been missing since Wednesday was discovered by Valais Police on Friday near Sass Fee.
The national weather office, MeteoSwiss said in the northern parts of the country, highs of up to 34C are expected.
The mini-heatwave will continue on Monday, before a new weather system sets in on Tuesday with rain and cooler temperatures, the office said.