Koh Samui weather in October
Temperature, sea and sunshine in October: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in October
Good
Best time to visit: January – April
What is the weather like in Koh Samui in October?
In October, Koh Samui is hot: daytime highs average 28 °C, and even at night it stays warm at around 26 °C. The sea averages 29.1 °C – almost as warm as a bath. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 28 days, totalling 288 mm. The air is often humid and muggy. All in all, October is a good month for a holiday in Koh Samui.
October compared
How the weather changes from September to November. Tap a month to open it.
| SeptemberSep | OctoberOct | NovemberNov | |
|---|---|---|---|
| Score | 70 | 69 | 69 |
| Day | 29° | 28° | 28° |
| Night | 27° | 26° | 26° |
| Sea | 29° | 29° | 29° |
| Sun | 6 h | 6 h | 6 h |
| Rain days | 25 | 28 | 24 |
More details for October
- Daylight
- 11 h 56 min06:08 – 18:04
- UV index
- 12 · extremeclear sky, noon (estimate)
- Muggy days
- 31 daysdew point 18 °C or more
- Wind
- 13 km/haverage daily peak
- Cloud cover
- 85 %on average
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %43 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Koh Samui in October: quick answers
Is Koh Samui hot in October?
Yes. In October, Koh Samui is hot: daytime highs average 28 °C and nights stay around 26 °C.
Can you swim in Koh Samui in October?
Yes. In October the sea averages 29.1 °C – almost as warm as a bath.
Does it rain much in Koh Samui in October?
It rains often – on about 28 days, adding up to 288 mm.
Koh Samui month by month
The whole year in Koh SamuiAll destinations: Thailand
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)