Indonesia Weather, climate and geography
Indonesia has a tropical climate which is highly variable from area to area. The eastern monsoon brings the driest weather (June to September), while the western monsoon brings the main rains (December to March). Rainstorms occur all year. Higher regions are cooler. Temperatures average between 23°C (73°F) and 28°C (82°F) all year, but this tends to be humid heat, with humidity varying from 70% to 90%. Peak time for tourists to travel is in June, July and August, although prices will be higher; those travelling in the shoulder seasons of May and September could get lucky with both weather and prices.
Muddy roads can be a deterrent to travel in the wet season. Keep in mind that during local holidays public transport can be clogged, accommodation hard to find in holiday areas and businesses close.
Bring lightweight clothing with rainwear; cottons and silks will be most appropriate. Warmer clothes are needed for cool evenings and upland areas, thicker cottons and woollen garments may work best. Smart clothes such as jackets are required for formal occasions, and it is regarded inappropriate to wear brief clothes anywhere other than the beach or at sports facilities. Women should observe the dress code in Muslim areas that requires shoulders and legs to be kept covered.