It was nice and sunny today in my game, and I like that my hibiscus are in full bloom! I must admit I loved the rain, and especially the heavy downpours and thunderstorms, but they had been so frequent it's time to move on.
Your character sweats because you're wearing clothes that are inappropriate for summer. Jackets and long sleeved shirts usually cause it to happen. If you switch to a tank top or a T-shirt, it won't happen anymore.
I imagine that wearing summer clothes would cause you to shiver come winter, but we'll see!
I quite liked the rain, although the town does look good in the sun. Still didn't manage to find a Coelacanth though. I wonder if I'll have more luck once it starts snowing later this year.
I love all the seasons in AC. It just gives so many different dimensions to the game! But it's lovely now at night when it's been a clear day. The night sky in the NL version is just magnificent.