No, they call it “very warm”. Hot is heiss and reserved for (IIRC) over 30°.
I just listened a thunder here in Aargau next to Aarau. Today was a bit warm, but first thunderstorm?
Crazy times
I looked it up on https://www.lightningmaps.org/ and it was quite localised
It is 18C here and I just got a low temperature warning on my smartphone
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Indeed, only 1 lightning/thunder, light rain. Nothing else.
Hey, that website it’s so cool, a bunch of nerds working together 
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So warm today I seriously considered dragging my air conditioner out of the cellar.
I am not so seriously grumping… even if the wekkend weather is downhill… but it;s been nice … my windows and balcony doors are still open …