sunniest

/S AH1 N IY0 AH0 S T/
adjective
  1. 1

    (of weather or a day) Featuring a lot of sunshine.

    โ€œWhilst it may be sunny today, the weather forecast is predicting rain.โ€

  2. 2

    (of a place) Receiving a lot of sunshine.

    โ€œI would describe Spain as sunny, but it's nothing in comparison to the Sahara.โ€

  3. 3

    (of a person or a person's mood) cheerful

    โ€œa sunny dispositionโ€

  4. 4

    Of or relating to the sun; proceeding from, or resembling the sun; shiny; radiant.

Source: https://en.wiktionary.org/wiki/sunniest, https://en.wiktionary.org/wiki/sunny