@MarkNagy The SD-card was the important hint. Thanks!
I reinstalled Android on my tablet. Now I tried to add the widget but no windy widget appears in the list of widgets.
Does anybody have an idea what the reason could be? I did not find a similar post yet.
See hours for icon in attached screenshot
I have the same issue since 1 or 2 weeks on my Samsung tablet SGP511 with Android 6.0.1
+1 vote for this feature
Today the rain forecast was different for the 1 hour view and the 3 hours view (see attached screen shots):