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Indonesia has a tropical climate and the weather is hot and humid all year round, but cooler inland than along the coastal regions. The high temperatures and humidity are certainly something that takes getting used to for expats moving to Indonesia from cooler climates.
The country doesn't experience the four distinct seasons, with temperatures staying quite constant throughout the year; coastal regions average around 82°F (28°C) and the inland and mountain areas average around 79°F (26°C) year-round. The monsoon season from December to March brings heavy rains and can make travel around the country difficult. Tropical storms can also affect the country between September and December, causing major travel disruptions. The dry season, from April to October, is the most pleasant time of year and the best time to visit.
Lightweight clothing is sufficient throughout the year, and an umbrella or raincoat is essential to have on hand all year round.