The heat is now hitting the country's dairy herds, with cows producing less milk as they burn extra energy to stay cool.
The Swiss Farmers' Union says cattle enter serious heat stress at 25 degrees, and severe stress above 28.
Farmers are running fans and misters in barns, keeping herds indoors during the day and drawing on winter hay stocks weeks early.
Heat closes Geneva paddling pools
Soaring temps hit hospitals
Crans-Montana looks to summer season after fire tragedy
MétéoSuisse warns of budget cuts
Rents rise Geneva - more than Zurich
Better passenger rights coming
