Thailand
Koh Samui in September
🌦️ Dry → rainy seasonHot, humid and some showers.
🎒 Pack: light, breathable clothes & sunscreen · compact umbrella or rain jacket · quick-dry fabrics
Why September scores 8.2What goes into the score
How it works- Weather comfort6.8
- ✓Hot (32°C highs / 25°C lows)
- !Very humid/sticky (dew point 24.4°C)
- !Wet: ~118 mm rain, ~4 heavy-rain days
- Air quality10.0
- ✓Good (within WHO guideline) (PM2.5 ~5 µg/m³)
- Seasonal hazards10.0
- ·No notable seasonal hazards
- Safety baseline8.0
- ·Normal precautions
| Sep | Feb | |
|---|---|---|
| Score | 8.2 Very good | 8.3 Very good |
| Season | 🌦️ Dry → rainy season | ☀️ Dry season |
| High / low | 32° / 25° | 29° / 25° |
| Rain | 118 mm | 64 mm |
| Humidity | dew pt 24° | dew pt 23° |
| PM2.5 | 5 µg/m³ | 21 µg/m³ |
Typical-month data: NASA POWER (MERRA-2 reanalysis) 2015–2024 (modelled, not a forecast). Temperatures: Ko Samui weather-station normals. Rainfall: Ko Samui weather-station normals (national met service).
Holidays & crowdsSeptember 2027
No long holidaysNo long public-holiday weekends this month. School holidays aren't counted, so check those if you want to avoid family crowds.
No national public holidays in Thailand this month.
National holidays only; regional holidays and school breaks aren't included. Source: holidays (open-source public-holiday calendar).
Explore Koh SamuiEvents, sights, food & souvenirs
Check event dates locallyThailand's second-largest island, in the Gulf of Thailand, visited for beaches, resorts, temples and boat trips to the Ang Thong marine park.
No major events on our calendar for September.
Coming up later
Loy KrathongDate variesThai lunar calendar, usually November
People float candlelit offerings on the water.
Why go: It falls in the rainy season on Samui.
Where: Beaches and temples
SongkranEvery year13-15 April every year
Thai New Year, celebrated with water fights in the streets.
Why go: Expect to get soaked; keep phones in waterproof bags.
Where: Island-wide, especially Chaweng
Chaweng Beach
The island's busiest beach, with resorts and nightlife.
Lamai Beach
A long beach south of Chaweng, slightly quieter.
Big Buddha (Wat Phra Yai)
A large golden seated Buddha on a small island linked by causeway.
💡 Cover shoulders and knees.
Ang Thong National Marine Park
An archipelago of limestone islands reached by day-trip boat.
💡 Boat trips may be cancelled in rough weather, mostly in the late-year rainy season.
Fisherman's Village, Bophut
Old wooden shophouses with a Friday night walking street market.
Hin Ta and Hin Yai
Rock formations at Lamai known as Grandfather and Grandmother rocks.
Seafood
Grilled fish, prawns and squid.
💡 Beachfront restaurants and night markets
Southern Thai curries
Spicy dishes such as kaeng som and kaeng tai pla.
💡 Local Thai restaurants
Coconut-based dishes and drinks
Samui has long been known for its coconut plantations.
💡 Markets and stalls
Khanom jeen
Fermented rice noodles with curry sauces.
💡 Local markets
Coconut products
Coconut oil and coconut-based beauty products.
💡 Markets and shops
Thai silk and textiles
Scarves and clothing.
💡 Fisherman's Village and shops
Thai handicrafts
Wood carvings and homeware.
💡 Walking street markets