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We have the same expression in Dutch: "komkommertijd".

The Dutch Wikipedia mentions English, German or Jiddisch as possible sources: https://nl.wikipedia.org/wiki/Komkommertijd

Same in Polish "sezon ogórkowy"

Same in Estonia, "hapukurgihooaeg". Literal translation of the German "Sauregurkenzeit".

Everytime tehre is a funny word in German E.g. "Hechtsuppe" I assume it to be Jiddisch or Rotwelsch.

Sauregurkenzeit

Ah, so the US "dog-days of summer". Not going to lie, I prefer the silly-season nomenclature, it captures the lack of motivation and malaise that seems to set in during the height of summer much better. Thanks for the explanation, very interesting.

English "dog-days" is just a translation of Latin "caniculares dies", which came from the time of visibility before sunrise of the "Dog Star" a.k.a. Sirius.