That brings me back to my other post. (Bugs : tempest weather app) This is just a badly designed interface. The sun/clouds are not based on measured data, but taken from the hourly forecast. The interface is a confusing, in my opinion, unwanted mixture of measurement and forecast. This should never have happened for a weather station. It’s even more confusing because, as you noticed yourself, when it starts to rain it immediately reacts by turning the symbol in fully cloudy and rain. Which can be incorrect as well. I don’t like it. All the same info would be much better presented as shown for example in my photoshopped version Tempest app : first experiences