Thailand Koh Samui Weather in November — Climate Guide
November in Koh Samui is low
Koh Samui Weather in November — Quick Answer
As of 2026- Avg temp
- 29° / 24°
- Rainfall
- 340mm · 20 days
- Crowds
- Quiet
As of 2026, Koh Samui in November averages a high of 29°C and low of 24°C with 340mm of rain over about 20 days. Wettest month of the year — warm but very rainy, with the heaviest, sometimes torrential downpours. Around 29°C/24°C, very humid. A proper rain jacket, umbrella, and quick-dry clothing are essential. Seas rough. Sea ~29°C.
November is low for Koh Samui.
November is Koh Samui's wettest month — the peak of the northeast monsoon, averaging 29°C/24°C with the heaviest rainfall of the year (around 340mm over roughly 20 wet days), sometimes torrential, with occasional flooding of low-lying roads.
Seas are rough and boat trips to Ang Thong, Koh Phangan, and Koh Tao are routinely canceled. This is the one month most worth avoiding for a beach-and-boat holiday on Samui, even though prices are at their lowest and crowds are minimal.
Travel score
Koh Samui November Weather Stats
Avg High
29°C
Avg Low
24°C
Rainy Days
20
340mm total
Sunshine
4.5h
Daily avg
Humidity
85%
muggy
UV Index
9
Very high
Wind
16 km/h
Gusts 32
Sea Temp
29°C
Avg water temp
Crowds
Quiet
At attractions
November Sunrise & Sunset
Air Quality
PM2.5
12 μg/m³
PM10
22 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
34°C
Nighttime
26°C
Humidity and wind affect how the actual temperature feels.
Wind
16 km/h
Max gust 32 km/h
Activities Recommended for November
November Travel Pros & Cons
Pros
- Lowest prices and minimal crowds
- Loy Krathong lantern festival (if dates match)
- Lush, dramatic green scenery
- Atmospheric for a quiet resort retreat
Cons
- Wettest month — heaviest, sometimes torrential rain
- Boat trips routinely canceled
- Rough seas and possible road flooding
- Andaman coast is far better now — switch coasts
November Events & Festivals
- Wettest month of the year — peak northeast monsoon
- Loy Krathong / floating-lantern festival (date varies)
- Boat trips routinely canceled
- Lowest prices — but the biggest weather gamble
Koh Samui in November — Full Picture
November is Koh Samui's wettest month — the peak of the northeast monsoon, averaging 29°C/24°C with the heaviest rainfall of the year (around 340mm over roughly 20 wet days), sometimes torrential, with occasional flooding of low-lying roads.
Seas are rough and boat trips to Ang Thong, Koh Phangan, and Koh Tao are routinely canceled. This is the one month most worth avoiding for a beach-and-boat holiday on Samui, even though prices are at their lowest and crowds are minimal.
Loy Krathong, Thailand's beautiful floating-lantern festival (date varies by lunar calendar), often falls in November and is a lovely cultural highlight if your trip coincides — small decorated floats are released onto the water at night.
The Gulf-versus-Andaman contrast is at its starkest now: November is Samui's worst month but among Phuket and Krabi's best — so for a November Thailand beach trip, the west coast is the smarter choice.
The sea stays warm (~29°C) but rough and murky. If you must come, plan a flexible, resort-and-food-focused trip with indoor backups.
What to Wear & What to Pack
Wettest month of the year — warm but very rainy, with the heaviest, sometimes torrential downpours. Around 29°C/24°C, very humid. A proper rain jacket, umbrella, and quick-dry clothing are essential. Seas rough. Sea ~29°C.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
31.7°C
25°C
10/mo
Summer (Jun·Jul·Aug)
32°C
25°C
13.3/mo
Autumn (Sep·Oct·Nov)
Current30°C
24.3°C
18/mo
Winter (Dec·Jan·Feb)
29°C
24°C
12.3/mo
Koh Samui Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 29° | 24° | 14d·180mm | 6.5h | 82% | 10 | Very busy | Peak | |
| February (Best) | 30° | 24° | 6d·60mm | 8h | 78% | 11 | Very busy | Peak |
| March (Best) | 31° | 25° | 7d·75mm | 8.5h | 78% | 12 | Busy | Peak |
| 32° | 25° | 9d·100mm | 8.5h | 78% | 12 | Busy | Peak | |
| 32° | 25° | 14d·150mm | 7h | 80% | 11 | Moderate | Shoulder | |
| 32° | 25° | 13d·110mm | 7.5h | 78% | 11 | Busy | Shoulder | |
| 32° | 25° | 13d·110mm | 7.5h | 78% | 11 | Very busy | Peak | |
| 32° | 25° | 14d·110mm | 7h | 78% | 11 | Very busy | Peak | |
| 31° | 25° | 15d·150mm | 6h | 80% | 10 | Moderate | Shoulder | |
| 30° | 24° | 19d·290mm | 5h | 84% | 9 | Quiet | Low season | |
| 29° | 24° | 20d·340mm | 4.5h | 85% | 9 | Quiet | Low season | |
| 28° | 24° | 17d·230mm | 5h | 84% | 9 | Very busy | Peak |
View Other Months
Koh Samui November Hotel Picks
Frequently Asked Questions
Is November a good time to visit Koh Samui?
Koh Samui in November is low. Tourist crowds are quiet and flight/hotel prices are low season.
What's the average temperature in Koh Samui in November?
Koh Samui November averages a high of 29°C and a low of 24°C.
Does it rain much in Koh Samui in November?
Koh Samui November averages 340mm of rainfall over about 20 rainy days.
What should I wear in Koh Samui in November?
Wettest month of the year — warm but very rainy, with the heaviest, sometimes torrential downpours. Around 29°C/24°C, very humid. A proper rain jacket, umbrella, and quick-dry clothing are essential. Seas rough. Sea ~29°C.
What time are sunrise and sunset in Koh Samui in November?
Koh Samui November sunrise is 06:05 and sunset is 18:05, with 12h 00min of daylight.
What's the air quality like in Koh Samui in November?
Koh Samui November air quality (AQI) averages 35, rated Good. PM2.5 averages 12μg/m³.
What activities are recommended in Koh Samui in November?
In November, Koh Samui is great for Resort & spa retreat, Loy Krathong festival (if dates match), Fisherman's Village dining.
Is November peak season in Koh Samui?
Koh Samui November crowds are quiet and prices are low season. You can travel relatively comfortably without long queues.
Best Months to Visit Koh Samui
View Other Months
Planning a November trip to Koh Samui?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.