Paraty weather in September

September is the end of the cooler, drier winter run regulars date from June, and a first-week visitor describes good atmosphere without crowds. A caution about our own figures: the 17.8C here reads far cooler than anyone describes the beaches, because the grid square takes in the island's forested high ground rather than the shore - the 24.1C sea is the number to trust for Lopes Mendes and Abraao. What the month does carry is 76mm across 11.2 precipitation days, and the island's best day out depends on it: the four-beach boat trip runs to Praia do Pouso and then a forest trek to Lopes Mendes, and needs decent conditions. Abraao is where you wait one out. The record: humidity 81 percent, 9.5 hours of sun and AQI 76.

Paraty's forum is direct that December through March is both the hottest and wettest stretch of the year here, the opposite of the drier June-August winter. The typical pattern posters describe is a run of a few hot, sunny days good for beach-hopping around Ilha Grande, then a few days of rain - usually building through the afternoon rather than an all-day soak - though some visitors have hit genuinely extended wet stretches around the holidays. It's a real trade-off: peak heat and lushness against a real chance of your beach days getting interrupted.

Forum posters describe July as genuinely dry and sunny for Paraty - blue skies are the norm, with a real stretch of three consecutive rainy days called unlikely even if the odd cloudy day shows up. That said, posters are consistent this isn't beach weather: July is winter across most of Brazil outside the northeast, and the water around Paraty and nearby Ilha Grande runs distinctly cold and even colder than nearby Buzios' at the same time of year. The clear framing from posters: skip the beach plans and use July instead for exploring Paraty's well-preserved colonial old town and cobblestone streets, comfortable temperatures making it genuinely pleasant for walking around without summer's heat and humidity.