It is humid hot and humid cold. It does get pretty cold in the winter with the humidity. And it rains A LOT.
It is a very heavy walking mission. Be prepared to walk a ton. Bring a pair of tennis shoes along with your other shoes.
Get good boots that are waterproof. And really good quality socks. They wear through cheap socks and end up causing foot issues.
Also a waterproof bag.
Sisters are allowed to wear sandals in the summer. Be prepared to walk through several pairs. Brands that have been recommended are Tevas and Chacos.
Sisters: Tampons are not always the best quality and can be quite expensive, so consider bringing a mission's supply or using a cup or disc.
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Most parents send their Elders with at least 1 suit (most countries in South America only wear suits to church and meetings) and around 8–10 golf pants. Families are sending more shirts because of heat and humidity — 12–14 is the average. Note for Sisters serving in Brazil: feminine hygiene products are expensive there and tampons are often considered taboo. Be prepared to send a good supply with your Sister Missionary.
Serve shirts have a ventilation panel in the side of the shirt making them noticeably more breathable. Missionaries serving in hot or humid places absolutely RAVE about this feature. The most popular shirt for hot-climate missions, for sure.