Koh Samui FAQ: Safety

Is Koh Samui safe for tourists?

Koh Samui is generally a safe, well-established tourist island; the main documented risks are practical ones. Sea: rip currents on east-coast beaches (worst November-January) - obey red flags. Roads: scooter accidents are the most common tourist injury; you legally need a motorcycle licence plus IDP, and helmets are required. Health: mosquitoes can carry dengue, so use repellent. Box jellyfish stings are rare but serious (July-October) - vinegar on the sting and call 1669. Keep normal big-resort-town awareness at night in Chaweng.

Are mosquitoes dangerous in Koh Samui?

Mosquitoes on Koh Samui can transmit dengue, chikungunya and Zika. Dengue is the main concern and is present year-round, with more cases in the wet season. There is no vaccine or specific treatment for travellers, so prevention matters: use repellent, cover arms and legs at dawn and dusk, and choose rooms with screens or air conditioning. See a doctor for high fever with severe headache or joint pain, and avoid self-medicating with aspirin or ibuprofen if dengue is suspected.

Are there dangerous snakes in Koh Samui?

Koh Samui has many snake species and most are harmless, but venomous species do exist on the island. Encounters are uncommon and snakes avoid people; most sightings are in jungle, gardens or after rain. Simple precautions: do not walk barefoot in jungle or long grass, use a torch at night, do not put hands into rock piles or dense bushes, and never try to catch or corner a snake. If bitten, keep the person still, note the snake's appearance, and call the ambulance hotline 1669.

Are stray dogs a problem in Koh Samui?

Koh Samui has large numbers of free-roaming 'soi dogs', reportedly in the thousands. Most are timid or indifferent, but some can be territorial, especially at night or in packs. Do not pet unfamiliar dogs, do not run past them (it triggers chasing, a real issue for scooter riders), and give feeding mothers a wide berth. If bitten or scratched, wash the wound thoroughly and seek medical care promptly - rabies exists in Thailand and post-exposure treatment is time-critical.

Is it safe to rent a scooter in Koh Samui?

Scooter rental is the most popular way to explore, but accidents involving tourists are common. Stay legal and covered: motorcycle licence from home plus an International Driving Permit with motorcycle category - without them, insurance may not pay. Always wear a helmet (fines up to 2,000 THB since June 2025). Photograph the bike before riding away. Take extra care on the steep southwest hills (4170), on wet roads in October-December, and never ride after drinking. If you are not an experienced rider, use songthaews and Grab instead.