They have spring-like weather all year. It is moderately rainy.
Pack good shoes, they walk a lot!
The mission list does not include tennis shoes, but you will want some.
It can get a little chilly, so a blanket for cooler nights is nice.
Sisters: pack all your feminine hygiene products for your whole mission. They have nothing. Some recommendations have been to try a cup or disc before a mission.
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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.