Be prepared for all 4 seasons. It will get hot in the summer, cold in the winter. It rains a ton, but doesn't snow, so a good umbrella, good rain boots, and a warm zip-out liner coat. A good rain coat is very helpful. A lot of walking, so bring good shoes. The roads are dirt and are hard on shoes, so bring 3-4 pairs.
They wear their suits a lot, so invest in washable ones that can be easily cared for.
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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.