Indonesia in October: Weather, Crowds & What to Expect

Sumatra (Northern and Western Sumatra)

The first hints of the wet season begin to reappear in October with occasional heavy showers returning, especially towards the month’s end; afternoons can be unpredictable. This transition brings greener landscapes and swelling waterfalls around Bukittinggi, but also the early start of the peat-fire season in bad El Niño years - smoke advisories sometimes appear in late October. Plan for flexible travel and keep travel insurance that covers weather delays.

Java & Bali (Central and Eastern Java, Bali, Lombok)

A return of sporadic showers in October signals the end of the long dry spell; afternoons can produce sudden downpours though many days remain pleasant, especially early in the month. Bali’s rice paddies start to green after irrigation resumes and volcanic areas may experience mistier mornings. Travellers will find fewer crowds and better hotel deals, but should be ready for a mix of sun and sudden rain.

Kalimantan (Indonesian Borneo)

Rain returns more noticeably in October, bringing an increase in humidity and intermittent storms that can affect river currents and shoreline landings. By month’s end the landscape is lush and waterways fuller, which is scenic but can complicate access to some remote sites. Expect more frequent delays to boat schedules and pack waterproof gear for hikes and camps.

Sulawesi & the Maluku Islands

By October showers return more regularly, and sea conditions can become choppier, making some inter-island ferries less reliable. Ambon and the central Maluku can see heavy rainfall periods; inland Sulawesi begins to transition back to wetter weather. Plan for more flexible schedules, particularly for remote islands where a single cancelled ferry can disrupt onward travel.

Nusa Tenggara & Komodo (Lombok, Sumbawa, Flores, Sumba, Komodo National Park)

Short, isolated showers begin to return in October, though many days are still pleasant and warm in the region; sea conditions may become a touch rougher later in the month. Komodo park remains visitable but keep an eye on ferry schedules as occasional weather events can cause brief cancellations. Travellers find lower prices than peak season but should still book essential transfers with some lead time.

Papua (Western New Guinea: Highlands and Coastal Papua, Raja Ampat area)

October brings increased rainfall to coastal regions and a return to more unsettled weather overall, although highland pockets can still have decent days. Raja Ampat and other coastal archipelagos may begin to experience rougher seas and reduced dive visibility as the wet season approaches. Flight reliability into smaller airstrips decreases and travellers should allocate buffer days for onward travel.