Power supply is usually 220 volts/250 cycles in large cities, but 110 volts is still used in some areas. Normal outlets are plugs with two rounded pins. Check before you plug your appliances in. Don't count on hotels to carry adapters.
Hot and humid with temperatures ranging from 21 C to 33 C. A sweater is needed for cooler mountain nights. Wet season: Nov - Apr, Dry season: May - Oct.