Sumatra
Sumatra is the largest island lying wholly within Indonesia, with rainforest national parks, volcanic highlands and Lake Toba.
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Sumatra is the largest island lying wholly within Indonesia, one of the Sunda Islands in the west of the country. The island runs about 1,790 km diagonally from northwest to southeast. The Indian Ocean borders its west coast, and the Strait of Malacca separates it from the Malay Peninsula. The Bukit Barisan mountains run almost its full length, with several active volcanoes. The equator crosses near the centre.
Travelers come for rainforest, wildlife and volcanic highlands. Lake Toba, the island's best-known lake, fills a caldera left by a supervolcanic eruption about 74,000 years ago. Gunung Leuser, Kerinci Seblat and Bukit Barisan Selatan national parks form a World Heritage rainforest site, home to the critically endangered Sumatran tiger and Sumatran orangutan. The climate is hot and humid, and seasonal smoke haze from forest burning often causes severe air pollution. The island is too large for one trip, so pick one or two regions.
Sumatra in five
- Pick one corner and fly into itNorth Sumatra with Medan, Toba and Bukit Lawang is the easiest first loop. Padang and the Minangkabau highlands, or Aceh and Weh island, are separate trips.North Sumatra
- See orangutans on a guided jungle trekBukit Lawang and the Gunung Leuser area are known for semi-wild orangutans. Treks run only with licensed guides, and distance rules protect the apes.Bukit Lawang
- Allow a full day for Medan to TobaThe road from Medan to Lake Toba is slow and takes several hours. Stay on Samosir island for two nights to make the transfer worthwhile.Danau Toba
- Dress and plan for Aceh's rulesAceh applies local religious rules, so dress modestly and expect no public alcohol. Check the current rules before you go.Aceh
- Carry rain gear all yearThe west of Sumatra can see rain in any month, and jungle trekking is muddy. Keep electronics in dry bags, and keep a margin for road delays.Travel insurance
Things to do in Sumatra
See all attractions in Sumatra
Need to know
- Airport
- Kualanamu (KNO) near Medan; Padang (PDG); Banda Aceh (BTJ)
- Getting there
- Flights from Jakarta and Kuala Lumpur to Medan
- Getting around
- Car with driver; buses; short domestic flights
- Best base
- Medan for Bukit Lawang and Toba
- Time needed
- 7–10 days for one region
Weather by month
- Best
- Good
- Mixed
- JanuaryDrier, hot
- FebruaryDrier, hot
- MarchHot, showers
- AprilShowers build
- MayShowers
- JuneDrier, trekking
- JulyDrier, trekking
- AugustDrier, busy
- SeptemberShowers return
- OctoberWet, humid
- NovemberWet, humid
- DecemberWet, humid
Right now in Sumatra
Local time, today's weather and the exchange rate, refreshed through the day.
23
- Feels like
- 28°
- Humidity
- 98%
- Wind
- 4 km/h
- Chance of rain
- 86%
Sumatra
03:40 AM
Tuesday, November 3
- Today30°21°86%Tuesday: Rain. High 30°, Low 21°. Chance of rain 86%.
- Wed29°22°89%Wednesday: Rain. High 29°, Low 22°. Chance of rain 89%.
- Thu29°21°100%Thursday: Rain. High 29°, Low 21°. Chance of rain 100%.
- Fri29°21°94%Friday: Rain. High 29°, Low 21°. Chance of rain 94%.
- Sat29°21°73%Saturday: Rain. High 29°, Low 21°. Chance of rain 73%.
- Sun29°21°98%Sunday: Rain. High 29°, Low 21°. Chance of rain 98%.
Updated 12:21 AM local time · Powered by WeatherAPI.com · Weather data by Open-Meteo.com
Money
Mid-market rate1 USD = 18,144 IDR
Rates from Nov 2, 2026 · Rates By Exchange Rate API
Day trips by train
- Bukit Lawangabout 3–4 hours by road from MedanJungle trekking beside the Bohorok river, with orangutan sightings.Read the guide
- Lake Tobaabout 4–5 hours by road from MedanA volcanic crater lake with Batak villages on Samosir island.Read the guide
- Padang and the highlandsby air from Medan or JakartaA different side of Sumatra: Minangkabau culture and coastal surf.Read the guide
Before you go to Sumatra
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Rules for Sumatra, checked
- Indonesia's visa and entry rules change, so check the Directorate General of Immigration site (imigrasi.go.id) before you fly.
- Aceh province applies Islamic law, so dress modestly there and check local regulations on alcohol and public behaviour before you go.
- Carrying or buying tiger, elephant or orangutan parts is illegal; check what you can take home with Indonesia's customs service (beacukai.go.id).
Plan around Sumatra
Medan, Toba and Bukit Lawang in one loop
Read the guideBukit LawangOrangutans and river camps
Read the guideDanau TobaSamosir island and the crater lake
Read the guideAcehDive coast and local rules
Read the guideMentawai IslandsRemote surf breaks off the west coast
Read the guideAll of IndonesiaIslands, entry rules and getting around
Read the guideSumatra FAQ
How many days do you need in Sumatra?
Seven to ten days covers Medan, Bukit Lawang and Lake Toba without rushing. Add days for Padang or Aceh, which sit far from the northern loop.
Is Sumatra worth visiting?
Yes, if you want rainforest, volcanic lakes and fewer crowds than Bali. It takes more planning, and roads are slow, so choose one region rather than the whole island.
Where can you see orangutans in Sumatra?
Bukit Lawang and the Gunung Leuser area, with trekking from the village. Sightings are never guaranteed, so allow two days and book a licensed guide.
How do you get from Medan to Lake Toba?
By car or shared minibus, normally four to five hours to the lake shore, then a boat to Samosir. Check traffic and leave early so you arrive in daylight.
When is the best time to visit Sumatra?
June to August is generally the driest for Medan and the north, though rain can fall in any month. The west coast and the Mentawai islands have their own surf seasons.