Koh Samui in May: weather, sea & travel advice
Koh Samui in May is especially suited to beach holidays, city breaks and family holidays. Days are around 30 °C (warm), and the sea is about 31 °C. With about 10 rainy days it is moderate.
Koh Samui · MayPhoto: Sonia Selivonchik · CC BY-SA 4.0Climate facts
- Day
- 30 °C
- Night
- 28 °C
- Sea
- 31 °C
- Rainy days
- 10 rainy days
- Sun
- 7 h/day
- Humidity
- 78 %
Suitability by travel type
BeachGood73/100
City breakGood69/100
ActiveLimited53/100
FamilyGood68/100
In favour
- Pleasant daytime temperatures around 30 °C
- Warm, swimmable sea (31 °C)
To consider
- No significant drawbacks.
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 May
Frequently asked questions
How warm is Koh Samui in May?
Daytime highs average around 30 °C, with nights around 28 °C.
Can you swim in Koh Samui in May?
The sea is about 31 °C (very warm).
Does it rain a lot in Koh Samui in May?
On the long-term average, expect about 10 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.