Best Time to Visit Indonesia: Weather by Month, Seasons and Festivals

Indonesia does not have four seasons, only wet and dry, driven by two monsoon winds. From roughly May to September the south-east monsoon blows dry air up from Australia over Java, Bali, Lombok, Flores and southern Sulawesi, which is why those islands turn brown and dusty by September. From November to March the north-west monsoon arrives loaded with moisture from the Asian mainland and the South China Sea, and the same islands get daily thunderstorms, usually in the afternoon and evening. Temperatures barely change: lowland highs sit at 30 to 33°C (86 to 91°F) all year, with the difference between seasons being humidity and rainfall rather than heat.

The pattern weakens as you move towards the equator and reverses once you reach the far east. Sumatra and Kalimantan sit on or near the equator and are wet most of the year, with a relatively drier window from June to September. Ambon and the Banda Islands in Maluku have mountains that catch the south-east wind, so their rainy season is May to August and the clear months are October to March. In Raja Ampat, off the western tip of Papua, the south-east wind of July and August brings rough seas and the best diving is October to April. The main Jakarta climate table below describes western Indonesia; use the regional section to adjust for wherever you are actually going.

Bali and Java follow the textbook pattern. Rain in Yogyakarta falls mostly between December and February, when Borobudur sunrise tours still run but the volcano views that make them worthwhile are often lost in cloud. Mount Bromo and the Ijen crater are clearest from June to September; this is also when Bromo is at its coldest, so pack a proper jacket. On Bali the dry months bring offshore winds to Kuta and Uluwatu for surfers and calm seas for day trips to Nusa Penida, while the wet season turns the Jatiluwih rice terraces their deepest green.

Komodo boats run all year from Labuan Bajo, but January and February bring the roughest seas and some operators pause for maintenance. April to June is the sweet spot: the hills of Padar and Komodo Island are still green from the rains, the water is clear and the July-August crowds have not arrived. Kelimutu’s coloured lakes on Flores are best seen at sunrise in the dry season, when cloud is less likely to sit on the crater.

• Surfing: Bali’s west coast (Kuta, Canggu, Uluwatu), G-Land in East Java, Desert Point on Lombok and Lakey Peak at Hu’u on Sumbawa all work best with the dry-season offshore winds from April to October. Bali’s east coast (Keramas, Nusa Dua) and Batu Karas in West Java are wet-season breaks, November to March. Mentawai charters run April to October with the biggest swells June to September.
• Diving: Komodo April to November, Bunaken and the Derawan Islands March to October, Wakatobi March to December, Alor April to November, Raja Ampat October to April. Manta rays are at Komodo’s Manta Point all year but most numerous December to February, when the plankton-rich water also cuts visibility. Mola mola (oceanic sunfish) appear off Nusa Penida from July to October.
• Volcano trekking: Mount Rinjani on Lombok is closed every year from January to March and is most comfortable from May to September; the three-day trek is cold and wet in April and December. Bromo and Ijen can be climbed year-round but the pre-dawn views need the clear skies of June to September. Mount Batur in Kintamani is a two-hour sunrise hike with the same dry-season logic.
• Orangutans: wild sightings at Bukit Lawang are possible all year; the trails are drier from February to August. Tanjung Puting’s klotok river trips in Kalimantan are easiest from June to September, when the feeding platforms are reachable without wading.
• Temples and cities: Yogyakarta, Solo and Jakarta are fine all year if you plan indoor afternoons in the wet season. The open-air Ramayana Ballet at Prambanan only runs from May to October; in other months it moves indoors.
• Beaches: Bali, the Gili Islands and south Lombok from May to October; Pulau Weh (Iboih, Sabang) off Aceh from February to August; Bira in South Sulawesi from May to October; the Banda Islands and Raja Ampat from October to March.

There are three price peaks. July and August bring European and Australian school holidays, and Bali villas, Komodo boats and Gili bungalows charge 30 to 50 percent more than in May or September; Ubud dance performances and the Bromo jeep queue are at their busiest. Christmas to New Year is the single most expensive fortnight in Bali, with minimum-stay rules and rates that can double, even though it falls in the wet season. The third peak is domestic. During Lebaran (the Eid al-Fitr holiday, around 20 March 2026 and 10 March 2027) tens of millions of Indonesians travel home in the mudik exodus, then take holidays: Java’s trains sell out weeks ahead, Yogyakarta and Bali hotels fill with domestic visitors, Jakarta empties and many small warungs on Java close for two or three days. The Indonesian school holiday from late June to mid-July adds domestic crowds to Bromo, Borobudur and Bali.

The cheapest months are February and March (outside Lebaran and Nyepi weeks) and late October to early December, when you can bargain hotel rates down 30 to 40 percent and have Prambanan to yourself by late afternoon. The compromise most repeat visitors pick is late April to June or September to mid-October: dry weather, green landscapes in the earlier window, and prices closer to low season than to August.

Fixed national holidays are easy to plan around; the religious ones move. Islamic dates follow the lunar calendar and shift about 11 days earlier each year, Balinese Hindu festivals follow the 210-day Pawukon calendar, and Nyepi follows the Saka lunar calendar. Dates below are the official or expected ones; confirm with the Indonesian tourist board before building a trip around them.

• January and February: Chinese New Year (17 February 2026, 6 February 2027) brings lion dances to Jakarta’s Glodok, Semarang and Singkawang, where the Cap Go Meh parade 15 days later is the biggest in the country. Bau Nyale on Lombok’s south coast, when thousands gather at dawn to catch sea worms, falls in February or early March.
• March: Nyepi, the Balinese day of silence, is 19 March 2026 and expected on 8 March 2027. The evening before, every village parades ogoh-ogoh demon effigies through the streets; on the day itself the airport closes, nobody may leave their hotel and the lights go off. Ramadan starts around 18 February 2026 and ends with Eid al-Fitr on or about 20 March 2026 (around 10 March 2027). Pasola, the mounted spear-throwing ritual on Sumba, happens in February and March.
• April and May: Easter processions in Larantuka (eastern Flores) draw Catholic pilgrims. Waisak (Vesak) brings thousands of Buddhists to Borobudur for a dawn-to-night celebration ending in a lantern release; the 2026 date is 31 May, with 2027 expected around 20 May. Jakarta’s Java Jazz Festival runs over a weekend in late May or early June. Eid al-Adha is around 27 May 2026.
• June and July: Galungan, when the ancestral spirits visit and penjor bamboo poles arch over every Balinese street, falls on 17 June 2026, followed by Kuningan on 27 June; the next cycle is 13 and 23 January 2027, then August 2027. The Bali Arts Festival fills Denpasar’s Taman Werdhi Budaya from mid-June to mid-July with nightly free dance and gamelan. Yadnya Kasada, when the Tengger people throw offerings into Bromo’s crater, falls in June or July.
• August: Independence Day on 17 August means flag ceremonies, street games and closed offices. Toraja funeral season is in full swing around Rantepao, the Jember Fashion Carnaval parades through Jember, and the Dieng Culture Festival on the Dieng Plateau releases lanterns and cuts the dreadlocks of the plateau’s “gimbal” children.
• September to December: Ubud Writers and Readers Festival runs for five days in late October. Christmas is a big event in Christian regions such as Manado, Toraja, Flores and Papua, and Bali’s Christmas-to-New-Year peak is the busiest fortnight of the year. Galungan returns in January 2027.

Light, loose cotton or linen for the lowlands, with one long-sleeved shirt and long trousers for mosquitoes at dusk and for mosques, temples and conservative regions like Aceh and West Sumatra. In the wet season a packable rain jacket and a dry bag for your phone matter more than an umbrella; downpours come with wind. For Bromo, Ijen, Dieng and Rinjani bring a fleece and a windproof layer whatever the month: Bromo’s viewpoint is 2,700 m (8,900 ft) and sits near freezing before dawn in July and August, and Rinjani’s crater rim drops below 5°C (41°F). A sarong does double duty as temple dress and a beach towel, though Balinese temples lend them. Reef-safe sunscreen, DEET repellent, rehydration salts and a basic first-aid kit are worth carrying because small islands have little in the pharmacies. Closed walking shoes for volcanoes, sandals for everything else, and earplugs for the 4.30am call to prayer.

Indonesia travel guide