Koh Tao in May sees very high temperatures, with highs around 31°C (88°F) and overnight lows of 28°C (82°F). Rainfall is fairly high at around 172 mm (6.8 in) on average, so pack waterproofs just in case.
Our weather planner can help you find worldwide destinations with pleasant weather during this period. January and February typically offer the best weather for Koh Tao.
Min Temperature
Max Temperature
Chance of Rain
Precipitation
Rainy days
Humidity
Sunshine
Percentage Sunshine
Pick a month to see the average temperature, rainfall and sunshine in Koh Tao - and find the best time to visit.
49-year average (1976-2025)
Based on our historical records, temperatures in Koh Tao typically stay consistent throughout May, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 27°C (81°F).
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Koh Tao spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Based on 44 years of weather observations in Koh Tao between 1982 and 2026, these are the recorded extremes.
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 is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Warm weather calls for comfortable, breathable clothing in May. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity
See the full Koh Tao climate overview or explore weather in Thailand.
Where to go in May - average daytime high across popular destinations.
Bangkok
36°C (97°F) Chiang Mai
36°C (97°F) Jomtien Beach
33°C (91°F) Hua Hin33°C (91°F) Ao Nang Beach31°C (88°F) Koh Samui31°C (88°F) Ko Lanta31°C (88°F) Patong Beach30°C (86°F) Need travel inspiration? Check out our bucket list articles and be inspired.
Getting Involved in Citizen Science in Koh Tao
Citizen science is the public participation in scientific research. Join others in collecting and submitting important information about the health of the local ecosystems, contributing to large scientific databases.
Discover Kok Kood: a hidden gem in Thailand
Discover the hidden gem of Thailand - Koh Kood! Explore stunning beaches, waterfalls and eco-friendly resorts while enjoying a peaceful atmosphere away from the crowds.
Warm Days, Cool Nights: 8 Destinations With the Perfect Day-Night Temperature
Prefer warm sunny days but cool evenings? Compare eight destinations with daytime temperatures of around 25–30°C, cooler nights, low rainfall and plenty of sunshine.
Where to Travel in July and August: Mexico, Thailand, Indonesia or Somewhere Else?
Compare July and August weather in Mexico, Thailand, Indonesia, Zanzibar and Sri Lanka, using historical climate data for temperature, rainfall and sunshine.
