We will add the timerange in the next or the following release. As Miloslav said, by default the widgets shows a 3 hourly range, but if you switched your forecast in the app to hourly values, the widget will too.

Hello, and thank you for your question. Currently, the UV index is shown only as a daily highest value and is not included in the hourly forecast. We have received requests to add hourly UV index data and to integrate it into hourly or 24-hour forecast tables, and these have been forwarded to our development team for consideration. The hourly forecast is designed to provide a simplified overview and does not include every parameter, such as the UV index. At this time, the forecast API provides the UV index only as a daily value, and there is no confirmed timeline for adding hourly UV index data or an overview widget. We hope we were able to answer your questions and wish you pleasant weather with meteoblue.