Weather by month
Koh Samui in October 2027
October falls in the Gulf-side rainy season on Koh Samui. Expect heavy showers and windy days, and keep your boat plans flexible.
October at a glance
- Average high
- 30.6 °C
- Average low
- 24.3 °C
- Rainfall
- 295 mm
- Rain days
- 15.8 days
77% more rain than an average month
Averages: WMO Climate Normals 1991–2020, Ko Samui (station 48550, Thai Meteorological Department observations), as published on Wikipedia (secondary source, checked 7 Nov 2026). Not a forecast — for warnings use the Thai Meteorological Department. TMD weather warnings
Season verdict
Rainy season — plan indoor options and flexible boat days.
Good for
Spa days, cooking classes, temples, cafés and markets, short drives between showers
Less good for
Snorkeling, long boat trips and anything that needs calm seas
Sea & boat trips
Northeast monsoon season: the Thai Meteorological Department issues strong-wave warnings in this period, and ferries or boat trips can be cancelled at short notice. Check the operator on the day.
Tip: when the northeast wind blows, the west and south coasts are often calmer than Chaweng and Lamai on the east side.
Open or closed
Ang Thong Marine National Park is usually open in October. Trips still depend on the sea on the day. Park information
Holidays & alcohol-sale bans in October 2027
No Thai holidays from our list fall in October 2027.
Full holiday calendar · Dates: Bank of Thailand holiday notifications and Thai press; check before you travel.
Events in October
No dated events are listed for October yet.
What to pack
A rain jacket, quick-dry clothes, sandals that grip, a dry bag and some indoor plans.
One next step
Rainy day? A local driver can build a flexible day around the showers — temples, markets, spa, cafés.
Plan a private day