Koh Tao Weather in May
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.
Rainfall in Koh Tao in May
You can typically expect 17 days of rain this month, averaging around 172 mm (6.8 in). This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Koh Tao in May
Daytime highs in Koh Tao in May reach 31°C (88°F), with nights around 28°C (82°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. At 28°C (82°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.
Sunshine in Koh Tao in May
Expect a lot of sunshine this month, with about 195 hours of sun. These sunny conditions add to the overall experience.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.
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 Koh Tao's climate page.
Koh Tao Temperature in May
Min Temperature
28°C (82°F)
Max Temperature
31°C (88°F)
Chance of Rain
58%
Precipitation
172 mm (6.8 in)
Rainy days
17 days
Humidity
80% *
Sunshine
195 hours *
Percentage Sunshine
*
Daily Historical Temperatures
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).
Average temperatures in May
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Koh Tao in May
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.
Koh Tao historical weather extremes in May
Based on 44 years of weather observations in Koh Tao between 1982 and 2026, these are the recorded extremes.
- On May 11, 1983, temperatures climbed to 37°C (99°F), marking the warmest May day on record.
- Koh Tao experienced its chilliest May day on May 17, 2009, reaching only 28°C (82°F).
- Nighttime temperatures dropped to 23°C (73°F) on May 22, 2006, marking the coldest May night on record.
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
poor
What to Wear in Koh Tao in May
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.What To Do in Koh Tao 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 Koh Tao's climate page.
Temperature Rainfall Sunshine Humidity
See the full Koh Tao climate overview or explore weather in Thailand.
