ThailandThe weather in May in Ko Samui
It's hot in May in Ko Samui with an average temperature of 34°C. Temperatures this month range from a low of 33°C to a high of 35°C. At night, you can expect temperatures between 27°C and 28°C.
Looking for sun? May isn’t a good month to be in Ko Samui. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in May for Ko Samui, Thailand. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 37°C in 2023, Ko Samui reached the highest temperature in May over the past 10 years. The lowest daytime temperature in this month was 28°C in 2022. The extreme nighttime temperatures ranged from a lowest recorded value of 23°C to a highest value of 30°C.
Water temperature
The water temperature at Ko Samui is 32°C this month. It’s really warm, perfect for a swim.
Rainfall amount
In May, there is an average of 171 mm of precipitation, spread over 19 days. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in May for Ko Samui
Click on any day in May to get detailed info about the usual weather on that day in Ko Samui. Check out the historical temperatures and precipitation over the past 10 years on this day.
May weather comparison
| Ko Samui | New York | |
|---|---|---|
| Average temperature | 34°C | 22°C |
| Max. temperature | 35°C | 28°C |
| Min. temperature | 27°C | -5°C |
| Total precipitation | 171 mm | 105 mm |
| Rainy days | 19 days | 14 days |
Start of May
The month of May starts in Ko Samui with hot temps, averaging around 34°C during the day and nights around 28°C.
Mid May
By mid-May, daytime temps rise to around 35°C, with nights around 28°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of May
By the end of May, the average daytime temperature in Ko Samui is around 34°C, while nighttime temps are about 28°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
The typhoon season in Ko Samui runs from June to November.
Check out the climate of Ko Samui for all months and discover the best travel time
Curious about the weather in other parts of Thailand? Check out the climate and weather for spots like Bangkok, Chiang Mai, Phuket, or explore other destinations in Thailand.
Temperature charts
These charts show the average temperatures in May in Ko Samui, Thailand. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in May in Ko Samui
Temperature in May in Ko Samui over the years
Precipitation charts
These charts show the average amount of precipitation in May in Ko Samui, Thailand. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in May in Ko Samui
Total precipitation in May in Ko Samui over the years
Daily UV index in May in Ko Samui
This chart shows the average daily UV index in May in Ko Samui, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in May in Ko Samui
Have you been to Ko Samui in May?
Share your weather experience in May in Ko Samui.
Average weather in Ko Samui by month
Click on a month below to see detailed weather info for Ko Samui. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.