4 seasons. They have warm, humid summers and mild winters. While it rarely dips below freezing in the winter, the humidity makes it feel pretty cold. There is a lot of rain, especially in the summer with heavy intense thunderstorms.
You walk A LOT in this mission. Invest in really good shoes. Most missionaries report going through 3-4 pair, and they take quite a beating.
Consider getting a couple pair of waterproof boots along with dress shoes, tennis shoes, and flip flops for the shower.
Some brands mentions for Elders are: ECCO, Cole Haan, and Bogs. Sisters have recommended Dansko and Clarks most often.
Also invest in quality socks. Regular socks will get torn quickly. Darn Tough socks hold up super well.
There are not clothing dryers, so get clothing that is wrinkle free and can dry quickly. Bring sweaters for layering in the winter. Evenings and nights can get cold for a month or two. A 3 in 1 coat with a zip out liner is nice to have.
Elders: You do wear suits a lot, but buy 1-2 WASHABLE suits. You don't need them to be fancy. Save money for good quality shoes. Quick-drying golf pants are ideal for every day wear. Alimen's & Gentle (Amazon) have been reported to hold up nicely along with the more expensive brands.
Sisters: Bring a lot of pants. You will want them.
Get a good rain coat that is WATERPROOF!
Your bag should be waterproof as well.
Nice to haves:
A good, sturdy umbrella.
Some sort of dog deterrent
Cortisone cream for itcy mosquito bites
A bluetooth keyboard
Mailing packages is very expensive.
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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.