The sun will rule the day in Guarulhos tomorrow, making it feel noticeably warm by the afternoon, though the morning starts off with a crisp chill. You'll want a light jacket early on, but by midday, the heat will build quickly under the bright, cloudless sky.

Temperatures will climb to around 31 degrees, with lows dropping to about 16 overnight, so the air will feel quite dry with humidity sitting at 41 percent. That dryness means the heat won't feel oppressive, but you'll still notice the sun's strength, especially since the UV index is high at around seven.

There's no rain in the forecast, and zero precipitation expected, so you can leave the umbrella at home. The wind will pick up a bit, blowing at roughly 23 kilometers per hour, which will offer some pleasant relief during the hotter part of the day.

If you're planning outdoor activities, aim for the late afternoon or early evening when the sun softens, and don't forget sunscreen and a hat for midday exposure. It's a great day for a walk or a trip to the park, just be ready for that temperature swing from morning to afternoon.