Weather
Weather in Ko Samui by month
The best time to visit is January–March, June and October, with average highs of 27–29°C and moderate rain. April is the warmest month (about 30°C by day) and January the coolest (26°C at night); November is the wettest (around 375 mm of rain) and February the driest.
Ko Samui weather by month
| Month | Jan★ | Feb★ | Mar★ | Apr | May | Jun★ | Jul | Aug | Sept | Oct★ | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High / Low (°C) | 27° 26° | 28° 26° | 29° 27° | 30° 28° | 30° 28° | 29° 28° | 29° 27° | 29° 27° | 29° 27° | 28° 27° | 28° 27° | 28° 27° |
| Rain (mm) | 135 | 38 | 114 | 90 | 170 | 167 | 166 | 144 | 181 | 246 | 375 | 262 |
Average daily high and low (°C) and monthly rainfall (mm) · Forecast: MET Norway (yr.no) · Climate averages: NASA POWER
Ko Samui month by month
- ★ Best time
January
27°/ 26°Warm
135 mm · some rainPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and some rain: around 27°C by day and 26°C at night, with about 135 mm of rain.
- ★ Best time
February
28°/ 26°Warm
38 mm · fairly dryPack: T-shirts, plus a layer for evenings
Good trips this month
Warm and fairly dry: around 28°C by day and 26°C at night, with about 38 mm of rain.
- ★ Best time
March
29°/ 27°Warm
114 mm · fairly dryPack: T-shirts, plus a layer for evenings
Good trips this month
Warm and fairly dry: around 29°C by day and 27°C at night, with about 114 mm of rain.
April
30°/ 28°Hot
90 mm · fairly dryPack: Light clothes, sun hat and sunscreen
Good trips this month
Hot and fairly dry: around 30°C by day and 28°C at night, with about 90 mm of rain.
May
30°/ 28°Hot
170 mm · some rainPack: Light clothes, sun hat and sunscreen · umbrella
Good trips this month
Hot and some rain: around 30°C by day and 28°C at night, with about 170 mm of rain.
- ★ Best time
June
29°/ 28°Warm
167 mm · some rainPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and some rain: around 29°C by day and 28°C at night, with about 167 mm of rain.
July
29°/ 27°Warm
166 mm · some rainPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and some rain: around 29°C by day and 27°C at night, with about 166 mm of rain.
August
29°/ 27°Warm
144 mm · some rainPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and some rain: around 29°C by day and 27°C at night, with about 144 mm of rain.
September
29°/ 27°Warm
181 mm · some rainPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and some rain: around 29°C by day and 27°C at night, with about 181 mm of rain.
- ★ Best time
October
28°/ 27°Warm
246 mm · some rainPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and some rain: around 28°C by day and 27°C at night, with about 246 mm of rain.
- This month
November
28°/ 27°Warm
375 mm · wetPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and wet: around 28°C by day and 27°C at night, with about 375 mm of rain.
December
28°/ 27°Warm
262 mm · wetPack: T-shirts, plus a layer for evenings · umbrella
Good trips this month
Warm and wet: around 28°C by day and 27°C at night, with about 262 mm of rain.
Weather questions about Ko Samui
Quick answers
When is the best time to visit Ko Samui?
What's the weather like in Ko Samui in November?
Warm and wet: around 28°C by day and 27°C at night, with about 375 mm of rain. Pack: T-shirts, plus a layer for evenings, umbrella.
When is the best time for sightseeing in Ko Samui?
January–March and June–October: that's when the weather suits it best — warm enough and mostly dry.
When is the best time for beaches and water sports in Ko Samui?
February–April: that's when the weather suits it best — warm enough and mostly dry.
What is the warmest month in Ko Samui?
April: average highs of about 30°C and lows of 28°C.
Which month has the most rain in Ko Samui?
How cold does Ko Samui get?
In January, the coolest month, days average 27°C and nights 26°C. Frost is rare.
Average daily high and low (°C) and monthly rainfall (mm) · Forecast: MET Norway (yr.no) · Climate averages: NASA POWER · Koh Samui Tours