During the tropical night of Friday to Saturday the mercury stayed above 20 degrees in many areas of the country.
The sticky night ushered in a dry, hot weekend with temperatures soaring to 34 degrees in Sion and Geneva, and 33 in Zurich, said MeteoSuisse.
The warm weather helped to bring record numbers out for Switzerland's biggest hip hop festival in Frauenfeld, with 170,000 attending over the three days, up from 133,000 last year, reported news agencies.
Others spent some of it shut in their cars as the start of the Swiss summer holiday season meant a seven kilometre tailback at the Gotthard road tunnel.
The heatwave was short-lived, however, with storms and rain forecast for Monday and Tuesday. As a taster of things to come, storms hit the region of Engelberg in central Switzerland on Sunday evening.
Vorläufig zum letzten Mal schwül-heiss. Vormittag ziemlich sonnig. Nachmittag/Abend teils heftige Gewitter. ^gf pic.twitter.com/NN6mkRc3oB- SRF Meteo (@srfmeteo) July 11, 2016
This week temperatures are set to fall by 10-12 degrees across the country, said MeteoSuisse, with around 30-50mm of rain expected between Monday afternoon and Tuesday evening.
However warmer weather should return towards the end of the week.