Just as a follow up. After adding Airpressure I suddenly noticed a quirck again with the min and max temp.
At nidnight the max temperature drops to the current temperature (which it is supposed to do, but then goes back to the max temperature of the day that has just passed.
The min temperature again started following the current temperature. Removing Airpressure did not resolve that, so maybe nothing to do with it
Oh well, it remains an adventure, I will sort it out 
UPDATE:
and then without me doing anything other than opening the weather thing in paper UI, it suddenly seemed OK again. Well, I’ll see how it goes
