Koh Samui in May
Hot and quieter
By Daan · Last reviewed October 2026
The short answer
May is a good time to visit Koh Samui.
May is hot and quieter, with short tropical showers.
May in detail
What May actually feels like
- Weather
- 26–33°C
- Hot, around 33°C, with showers.
- Crowds
- Moderate
- Quieter.
- Prices
- $$$
- Lower rates.
+Lower prices.
–Hottest month, some showers.
My tip for May
Book good hotels at shoulder prices.
- Beaches
- Spas
How May compares
Against the other eleven months
4th of 12 overall in Koh Samui, 5th for weather, 3rd for space, 3rd for value. The emptiest month is November; the best value is November.
See all twelve months for Koh SamuiNot set on May?
Even stronger months in Koh Samui
Weather
Weather in Koh Samui in May
In May Koh Samui averages a high of 33°C (91°F) and a low of 26°C (79°F), with about 132 mm of rain or snow over 11 wet days. The warmest month is May (around 33°C) and the coolest is January (around 29°C); the wettest month is November.
- Average high
- 33°C
- 91°F
- Average low
- 26°C
- 79°F
- Precipitation
- 132 mm
- Wet days
- 11
Climate data: World Meteorological Organization (Ko Samui, 1991–2020). Temperatures are averages of daily highs and lows.
Quick answers
Koh Samui in May: the questions people ask
- Is May a good time to visit Koh Samui?
- May is a good time to visit Koh Samui. It ranks 4 of 12 months in Koh Samui overall (5 for weather, 3 for space, 3 for value). The main upside: Lower prices. The main downside: Hottest month, some showers.
- What is the weather like in Koh Samui in May?
- Average highs are around 33°C and lows around 26°C. Expect about 132 mm of rain or snow over roughly 11 wet days. Hot, around 33°C, with showers. For comparison, the warmest month is May (around 33°C) and the coolest is January (around 29°C).
- Is Koh Samui crowded in May?
- Crowds are moderate. Quieter. The quietest month is November.
- How expensive is Koh Samui in May?
- Prices are at level 3 of 5 ($$$). Lower rates. The best-value month is November.
- When is the best time to visit Koh Samui?
- In the CrowdFreeViews month scores, February is the best month overall (May ranks 4 of 12). The quietest month is November and the best value is November.