Indonesia weather & when to go: September

September overview

There's still plenty of sunshine to enjoy, however as September rolls on the tourist crowds disperse and the temples, beaches and mountain peaks becomes less busy. Weather conditions across Indonesia are still favourable making September one of our favourite months to travel to Indonesia.

Very Good
Not Advised

Annual overview

  Best   Good
  Mixed   Poor
Jan Feb Mar Apr May Jun
Jul Aug Sep Oct Nov Dec

September's weather in detail


Visitor numbers are still high in early September however they start to decline as the month drawers to an end, which means September is a great time to visit Java if you wish to take advantage of peak weather conditions without peak crowds at the popular tourist spots of Yogyakarta and Borobudur. Days are still hot, with maximum highs of 33-34°C not uncommon (especially in Jakarta), although humidity levels are relatively low. September is one of the hottest, driest months of the year in Java.


As dry season comes to an end in Bali, September is still a predominantly dry month with plenty of sunshine and blue skies, and temperatures still a very warm 27°C, although rainfall can be expected towards the end of the month. Visitor numbers tend to drop off during September, meaning less crowds at temples and on the popular south coast beaches of Jimbaran, Seminyak and Sanur. In our opinion, September is one of the best months to be visiting Bali

Nusa Tenggara

Lombok, Flores, Komodo National Park, Sumba

You can expect another dry month on Lombok & the Gili Islands, Flores & Sumba in September, with plenty of sunshine. Temperatures start to climb towards the end of the month and can reach 31°C on occasion. Favourable diving and snorkelling conditions continue off the coast of Lombok, the Gili Islands and in the Komodo National Park, with water temperatures around 27°C.

September is another popular month to be visiting the Nusa Tenggara islands.


Sunny, dry days continue across southern Sulawesi, with the chance of showers in Manado and the northern regions. Humidity levels remain comfortable, although temperatures are gradually rising and the mercury can regularly hit 33°C & 34°C in September.  Minimal rainfall and hot, sunny weather means September is a good month to visit Sulawesi.


Weather conditions throughout Kalimantan in September are much the same as August: expect minimal rainfall, dry & sunny days and balmy temperatures which can reach 32°C. As the dry weather continues, it's a good time of year to spot orang-utans in Tanjung Puting National Park.  


September is one of the driest months of the year in Sumatra, although the odd intense downpour should still be expected in Medan and North Sumatra, especially towards the tail end of the month. Average temperatures remain around 28°C. Visitor numbers start to decline towards the end of September, making it a great time to visit Sumatra if you wish to enjoy peak conditions without peak crowds.

West Papua & Raja Ampat

September is the final month of the southeast monsoon in Raja Ampat. Strong winds and intense downpours can be expected at the beginning of September but will tail off by the end of the month. Wamena and the Baliem Valley are drier, although occasional showers can be expected, with average daily temperatures hovering around 23°C in the highlands and 30°C at sea level.

The Moluccas

September is shoulder season across the Molucca Islands. The central islands of Ambon and Seram typically experience less rainfall than previous months. The high winds that have plagued the Banda Islands in previous months have now disappeared, making September a good time of year to visit the Banda Islands. September is an excellent time of year for spotting the Greater Birds of Paradise on the island of Aru.

Our recommended journeys

Our Bali & Komodo In Style holiday is full of handpicked moments which make the journeys as engaging as the destinations. Spend time exploring the rural landscape and elaborate temples of central Bali, before journeying eastwards through the Komodo National Park - a biodiverse region of natural wonders - aboard a traditional Indonesian phinisi.

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Key Festivals & Religious Ceremonies

 Galungan Festival

 Galungan is a hugely important festival for Balinese Hindus, and occurs once in the 210 day cycle of the Balinese calendar. It marks the time of year when the ancestral spirits are believed to visit the earth, and rituals are performed to welcome and entertain them. The festivities last for 10 days ending with Kuningan, the day the spirits ascend back to heaven. 

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