Koh Samui weather in May (Bangkok Province, Thailand)

What can you expect from the weather in Koh Samui during May? Wondering if it's the right time to visit? Browse this page for a comprehensive overview of the weather conditions for that month.

In May, Koh Samui generally has very high temperatures and high rainfall. Throughout the day, temperatures typically settle at around 31°C. But by evening, they drop to around 28°C.

Keep in mind that while these are the average temperatures, there can be days that are even hotter. It's essential to be prepared for such heat. Wearing light, breathable fabrics and protecting yourself from the sun's intensity with hats or shades can make a difference. Hydration is key, so remember to drink plenty of water, especially if you find yourself outdoors for extended periods.

Koh Samui in May usually receives high rainfall, averaging around 126 mm for the month. Typically around 17 days of rainfall is expected.

With around 193 hours of sunshine, the days are mostly sunny. It gives a pleasant and vibrant feel to the area.

If your ideal day consists of dry skies and moderate temperatures January and February generally stand out with the best circumstances. While October and November tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Koh Samui climate page with graphs.

 

Koh Samui, monthly averages in May

Min TemperatureMin Temperature 28°C  
Max TemperatureMax Temperature 31°C  
Water TemperatureWater Temperature 29°C  
Chance of RainChance of Rain 56%  
PrecipitationPrecipitation 126 mm  
Rainy daysRainy days 17 days  
HumidityHumidity 80%  
SunshineSunshine 193 hours  
Percentage SunshinePercentage Sunshine  

Where to go in Thailand in May

Find out more about the weather in Thailand in May and which places have the best weather conditions in this month.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in Koh Samui in May?

It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool. However, there's a good chance of rain, so bring a raincoat just in case. With a water temperature of around 29°C this is a great month to swim so bring your swimwear.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in May.

Swimming
7/10
Cycling
7/10
Walking
7/10
Camping
7/10
Outdoor sports
7/10

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in Koh Samui.

Our site offers climate and forecast data for every country in the world. Are you going to Thailand? On this website you can find historical weather averages for many cities in Thailand. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.