Indonesia is distinctly tropical country. The east monsoon from June to September brings dry weather while the west monsoon from December to March is moisture laden bringing rain. The transitional period between these two are interposed by occasional rainshowers, but even in the midst of the west monsoon seasons, temperatures range from 21⁰ C to 33⁰ C except at higher altitudes which are much cooler. Heaviest rainfalls are recorded in December to January. Humidity is between 60 to 100%. Java island the temperature throughout the year between 22⁰ C to 29⁰ with humidity everage 75%. the wet season is from October to end of April. Bali island the climate is almost the same like Java island with everage temperature around 28⁰ C and rainy season is between October to April and the best time to visit Bali is during dry season from May to August. Sumatra island is hot and extremely humid since the island cut by equator. North equator theheavist rainfall is between October and April and dry season between May to September. South equator the heavist rainfall between December to February. Lombok the season almost the same like Bali but eastern part of Nusa Tenggara the temperature is hotter and lack of rainfall. Kalimantan (Borneo) is hot and damp. The wet period from October to March and dry season from July to September. Sulawesi the wet season from November and December to March and April. everage temperature from 26⁰ C to 30⁰ C. Irian Jaya is hot and humid in the northern coastal regions.