Weather & Climate of Indonesia - Because of its proximity to equator, Indonesia has tropical climate. Generally, the weather is hot and humid. Indonesian climate is divided into two distinct seasons: dry and rainy seasons. Most of Indonesia has their rainy seasons from October through April, but certain places like Maluku have theirs from March to August. During the rainy season, rain starts around noon and lasts into the afternoon. Some areas can have sudden showers for more than two hours.
The dry season does not mean that there are no rains. In fact tropical
showers in a dry season's afternoon is a regular affair. The average
annual precipitation is 1800mm. The temperature is almost constant
except for the exceptionally rainy season's nights, when it can drop.
The temperature on the coast is about 28° C Celsius and drops
dramatically in the highlands. For instance, in the highlands of Irian
Jaya, temperatures at night can drop to about 7° C, while during
daytime they reach to about 22° C.