The climate is doesn't have a huge swing- temps from 40s-60s, but a lot of cold rain! Waterproof everything! There is snow in some of the higher elevation areas. Blundstone boots for both Elders and Sisters have been loved. Get a good waterproof coat and lots of warm clothing. A sleeping bag will most likely be included in the packing list.
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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.