While it is mostly warm and hot, the ocean breeze can make it feel chilly as well. It doesn’t rain a lot, but when it does, it really rains and the streets get flooded.

You WALK everywhere. You can walk 10+ miles a day up bumpy dirt hills. You need good quality shoes.
Elders: pretty much all the good shoes mentioned anywhere. Missionaries prefer more of a hiking shoe or boot, though, and save regular dress shoes for church and conferences. ECCO Track 25, Johnston & Murphy, Dr. Martens Reeder Oxford, Cole Haans, and Florsheim Forecast have all been recommended. Waterproof is best for the times it does rain.
Sisters: Docs shoes and Chelsea boot are the most recommended.

Because it can get cold, a 3-in-1 jacket with a zip out liner is recommended. You don’t need a heavy duty warm coat. Thin gloves at most.
You will want a rain jacket.
Elders: some 1/4 zip sweaters and puffer vests are well liked.
You only wear suits to conferences, so just get a washable cheaper one.
3/4 of shirts should be short sleeved and 1/4 long.

You will need an umbrella.

The UV index is high here, so sunscreen is important.

With all the heavy walking up hills, missionaries prefer to ditch a side or sling bag in favor of a backpack. It doesn’t need to be large, just big enough to fit Preach My Gospel, a couple copies of The Book of Mormon, pamphlets and a water bottle.

Things missionaries are grateful to have brought:
Multitool, duct tape, paracord, moleskin for blisters, a dog deterrent, ear plugs and facemask if light sleeper, and a foldable Bluetooth keyboard.

Some prefer to also bring extra travel sheets or a sleep sack for exchanges.

Some of the mattresses are a little old, so a waterproof mattress cover is nice.