sunniest

adjective

1. (of weather or a day) Featuring a lot of sunshine.“Whilst it may be sunny today, the weather forecast is predicting rain.”
2. (of a place) Receiving a lot of sunshine.“I would describe Spain as sunny, but it's nothing in comparison to the Sahara.”
3. (of a person or a person's mood) cheerful“a sunny disposition”
4. Of or relating to the sun; proceeding from, or resembling the sun; shiny; radiant.