Ko Samui Weather in May
May in Ko Samui typically sees daytime highs of 31°C (88°F) and nighttime lows of 28°C (82°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Ko Samui in May
Historically, the month has about 17 days of rain, averaging 117 mm (4.6 in) in total. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Ko Samui in May
May in Ko Samui brings typical temperatures with highs around 31°C (88°F) and lows of 28°C (82°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights are warm at 28°C (82°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Ko Samui in May
With approximately 193 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.
Average water temperature in May
At 29°C (84°F), the water is very warm — more like a heated pool than the sea. Great for those who like warm water, though some may find it less refreshing on a hot day.For Ko Samui itself, January and February generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Ko Samui's climate page.
Ko Samui Temperature in May
Min Temperature
28°C (82°F)
Max Temperature
31°C (88°F)
Water Temperature
29°C (84°F) *
Chance of Rain
56%
Precipitation
117 mm (4.6 in)
Rainy days
17 days
Humidity
80% *
Sunshine
193 hours *
Percentage Sunshine
*
Best Places in Thailand in May
Find out more about the weather in Thailand and which places have the best travel conditions in this month. See all of Thailand in May →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in Ko Samui in May
Warm temperatures in May make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. With water temperatures around 29°C (84°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Ko Samui in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Ko Samui's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Ko Samui climate overview or explore weather in Thailand.
