It doesn’t matter what the weather is; it could be cold, non-sunny, or hot with strong sun rays. It will stiff damage your Skin, especially for Oily skin, by generating more and more oil content on the face.
Using sunscreen for oily skin and non-oily, all skin types is INDEED important. As it create a shield on your face against UVA and UVB rays. Also, some SUNSCREEN SPF 50 offers non sticky / non oily feel by controlling the discharge of oily content from your skin pores. There is many more reason of wearing sunscreen: https://divyyrana654.medium.com/why-wear-sunscreen-for-oily-skin-and-non-oily-f7b3037f7f9a