Koh Samui in August: weather, sea & travel advice
Koh Samui in August is especially suited to beach holidays, city breaks and family holidays. Days are around 29 °C (warm), and the sea is about 30 °C. With about 9 rainy days it is moderate.
Koh Samui · AugustPhoto: Sonia Selivonchik · CC BY-SA 4.0Climate facts
- Day
- 29 °C
- Night
- 27 °C
- Sea
- 30 °C
- Rainy days
- 9 rainy days
- Sun
- 7 h/day
- Humidity
- 81 %
Suitability by travel type
BeachExcellent80/100
City breakGood75/100
ActiveLimited57/100
FamilyGood75/100
In favour
- Pleasant daytime temperatures around 29 °C
- Warm, swimmable sea (30 °C)
To consider
- High humidity (81 %)
All months at a glance
27J
28F
29M
30A
30M
30J
29J
29A
29S
28O
28N
28D
6J
4F
6M
8A
10M
8J
8J
9A
11S
16O
19N
13D
Similar destinations in August
Frequently asked questions
How warm is Koh Samui in August?
Daytime highs average around 29 °C, with nights around 27 °C.
Can you swim in Koh Samui in August?
The sea is about 30 °C (very warm).
Does it rain a lot in Koh Samui in August?
On the long-term average, expect about 9 rainy days.
When is the best time to visit Koh Samui?
The most favourable months are usually the ones highlighted on the overview page. Values are historical averages, not a forecast.