If you’re waking up in São Sebastião tomorrow, you’ll be greeted by a bright, sunny day that feels genuinely warm by mid-afternoon once the morning chill burns off. The air will be noticeably damp, with humidity settling around 82 percent, which might make the early hours feel a little muggy before the sun dries things out.

Temperatures will climb to a pleasant 27 degrees at the peak, but don’t let that fool you, the morning starts quite cool, dipping to around 12 degrees, so a light jacket will be your best friend until the sun really gets going. That humidity means the warmth will feel soft and enveloping rather than sharp, perfect for a lazy afternoon outdoors.

There’s no rain in the forecast, with zero precipitation expected, and the wind will be a gentle breeze at about 12 kilometers per hour, just enough to stir the leaves but not strong enough to mess with your plans. The UV index sits at a moderate level, so if you’re spending hours outside, a bit of sunscreen wouldn’t hurt.

For your day in São Sebastião, the takeaway is simple: layer up for the cool start, enjoy the dry and sunny conditions, and maybe keep a hat handy if you’re going to be out during the warmest hours. It’s a textbook good-weather day to get things done or just relax.