Thailand in May: where is it warmest?
In May, Hua Hin is the warmest place with 33 °C by day, Ko Pha-ngan the coolest with 27 °C. 10 of 12 destinations have good holiday weather.
All destinations in May, warmest first
Long-term averages for the month: daytime high, sea, sunshine and rainy days.
| Place | Score | Air | Sea | Sun | Rain days |
|---|---|---|---|---|---|
| Hua Hin | 62 | 33° | 31° | 6 h | 21 |
| Chiang Mai | 35 | 33° | – | 7 h | 14 |
| Bangkok | 22 | 33° | – | 6 h | 20 |
| Pattaya | 69 | 31° | 31° | 6 h | 18 |
| Koh Samui | 72 | 30° | 31° | 7 h | 24 |
| Ao Nang, Krabi | 68 | 30° | 30° | 5 h | 27 |
| Khao Lak | 68 | 30° | 30° | 6 h | 27 |
| Koh Tao | 72 | 29° | 30° | 7 h | 22 |
| Koh Lanta | 69 | 29° | 30° | 6 h | 27 |
| Patong, Phuket | 68 | 29° | 30° | 6 h | 27 |
| Phuket | 68 | 29° | 30° | 6 h | 27 |
| Ko Pha-ngan | 72 | 27° | 30° | 7 h | 23 |
Thailand in May: quick answers
Thailand in May: where is it warmest?
The warmest places in May are Hua Hin (33 °C), Chiang Mai (33 °C) and Bangkok (33 °C).
Thailand in May: where is the sea warmest?
The sea is warmest at Hua Hin (31 °C), Pattaya (31 °C) and Koh Samui (31 °C).
Thailand in May: where is the weather best?
The best holiday weather in May – warm, sunny and dry – is in Koh Samui, Koh Tao and Ko Pha-ngan.
Thailand month by month
Thailand: weather & best time to visit
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences