Thailand
Koh Samui in November: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Koh Samui in November is climatically well suited to beach holidays. The average daily high is around 28 °C, and the sea is about 29 °C. With about 25 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
57/100 · #6
Warmth
#9
Dryness
#6
Sun
#12
Sea warmth
#9
Published best categories: none
Koh Samui · NovemberPhoto: Sonia Selivonchik · CC BY-SA 4.0Climate facts
- Average high
- 28 °C
- Average low
- 27 °C
- Sea
- 29 °C
- Rainy days (est.)
- 25 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 81 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| October | 28 | 27 | 28 | 265 | 5.6 | 82 | 3.4 | 29 | 56 |
| November (selected) | 28 | 27 | 25 | 396 | 5.2 | 81 | 4.3 | 29 | 57 |
| December | 28 | 26 | 18 | 253 | 5.3 | 80 | 4.7 | 28 | 64 |
How do the previous and next months compare?
Baseline: November (57/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| October | -1 | +0.2 °C | ±0 °C | +3.4 | -130.6 mm | +0.4 h | +0.3 % | -0.8 m/s | +0.4 °C |
| December | +7 | -0.4 °C | -0.6 °C | -6.6 | -142.7 mm | +0.1 h | -1.8 % | +0.4 m/s | -0.6 °C |
All twelve months in context
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Where to stay in Koh Samui
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Useful next decisions
Frequently asked questions
How warm is Koh Samui in November?
The average daily high is around 28 °C, with an average daily low of about 27 °C.
Can you swim in Koh Samui in November?
The sea is about 29 °C (very warm).
Does it rain a lot in Koh Samui in November?
The curated estimate is about 25 rainy days per month, not a directly measured long-term average. Total precipitation averages around 396 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Koh Samui?
By the climate score, January, February, March and December are the strongest months for Koh Samui. For a beach trip: January, February, March and December. November is not among them.