Teresina is one of the hottest missions in Brazil, so showering twice a day is normal.
Send your missionary with a thin, quick drying towel. The humidity makes regular towels moldy and gross. They do laundry multiple times a week and do not have dryers, so quick drying clothing is best. No cars or bikes, just a lot of walking, so bring good shoes.
It rains a lot, so bring a LIGHT rain jacket- nothing lined, a poncho (or purchase one there), or an umbrella
Sending packages is expensive and they often charge the missionary extra money when it gets there. Because of the humidity, ringworm is common, so send a lot of ringworm medication. Short sleeve shirts are best.
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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.
This is a very comfortable, durable shoe that missionaries serving all over have loved!
7 inch Rechargeable Fan. These have been recommended for missionaries serving in Mexico, Central and South America, the Caribbean and Africa. They help keep you cooler at night, but also help keep bugs like mosquitos off at night too.
The power goes out frequently, so it is nice to have a solar power fan.
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.