Summer is extremely hot and humid. Winter is pretty mild, though occasional colder days do happen, so a few sweaters and thermals are nice to have.
There is also a lot of rain, so shoulder bags that are waterproof or have a waterproof cover are ideal.
Bring a rain jacket. A 3-in-1 with a zip out fleece liner is perfect here.
Pack good shoes, 3-4 pair, as you walk A LOT in this mission. Because of the rain, it is also quite muddy.
Elders: Cole Haan Shortwing Oxfords and ECCO have been recommended as holding up well. Some missionaries prefer to wear ankle height waterproof boots more than dress shoes every day, though. You can buy rubber boots (knee high) there if needed.
Invest in quality socks!!! Get moisture wicking socks and a lot of them.
Elders: Because of the heat and humidity, lightweight, quick drying golf pants are ideal.
Sisters: lightweight and loose flowy dresses.
A portable rechargeable fan for nights.
The children love little stickers or small gifts that missionaries can hand out.
A filtered water bottle or an insulated water bottle to fill up at home is nice.
Bring small towels or handkerchiefs to wipe down during those hot days.
Apartments do have air conditioning and washing machines. You do line dry clothing, though.
Make sure towels are thin- like Turkish cotton or microfiber, so they can dry quickly.
They use WhatsApp to talk. They do not use messenger.
Because of new customs rules in Argentina, no packages can be sent to missionaries. Private companies still guarantee packages, but they are very expensive. It is best to send everything a missionary needs for the duration of the mission initially.
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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.