SeasonMapThailand in May
May is one of Thailand's weaker months (rank 10 of 12): its 19 destinations average 61/100, led by Ko Samui at 77 — 40°C and 20 rainy days — while Ko Tao is cooler at 34°C and scores 77.
#10 of 12 months for Thailand · 19 destinations · updated September 2026 · climate normals from ERA5 reanalysis
Where in Thailand in May
| # | Place | Type | Feels-like high | Rain | Comfort | At its best |
|---|---|---|---|---|---|---|
| 1 | Ko Samui | Island | 40°C | 131 mm · 20 days | 77 tier B | — |
| 2 | Ko Tao | Island | 34°C | 168 mm · 21 days | 77 tier B | — |
| 3 | Ko Pha Ngan | Island | 37°C | 163 mm · 22 days | 76 tier B | — |
| 4 | Pattaya | Beach | 40°C | 164 mm · 22 days | 75 tier B | — |
| 5 | Hua Hin | Beach | 40°C | 161 mm · 22 days | 74 tier B | — |
| 6 | Ko Lipe | Island | 36°C | 239 mm · 25 days | 69 tier C | — |
| 7 | Ko Phi Phi | Island | 35°C | 263 mm · 25 days | 67 tier C | — |
| 8 | Ko Lanta | Island | 39°C | 288 mm · 27 days | 64 tier C | — |
| 9 | Phuket | Beach | 39°C | 280 mm · 25 days | 62 tier C | — |
| 10 | Khao Lak | Beach | 39°C | 308 mm · 27 days | 61 tier C | — |
| 11 | Ko Chang | Island | 39°C | 335 mm · 29 days | 61 tier C | — |
| 12 | Krabi | Beach | 40°C | 311 mm · 28 days | 61 tier C | — |
| 13 | Chiang Mai | City | 41°C | 94 mm · 12 days | 52 tier D | — |
| 14 | Khao Sok | National park | 38°C | 293 mm · 28 days | 48 tier F | — |
| 15 | Bangkok | City | 42°C | 143 mm · 19 days | 47 tier F | — |
| 16 | Kanchanaburi | City | 42°C | 122 mm · 18 days | 47 tier F | — |
| 17 | Pai | Trekking hub | 38°C | 190 mm · 19 days | 47 tier F | — |
| 18 | Ayutthaya | City | 41°C | 154 mm · 21 days | 46 tier F | — |
| 19 | Chiang Rai | City | 40°C | 247 mm · 21 days | 46 tier F | — |
Comfort is SeasonMap's 0–100 score; each place is judged through the lens that suits it — beaches on beach weather, ski resorts on snow. "At its best" means May is one of that place's own top three months. Feels-like highs fold in humidity, wind and sun.
What's on in Thailand in May
- Samui Regatta · Ko Samui · 23–30 May
- Whale shark season · Ko Tao · 15 Mar – 31 May (usually)
- Full Moon Party · Ko Pha Ngan · 1 Jan – 31 Dec
- Manta and whale shark season · Khao Lak · 1 Feb – 5 May (usually)
- Inthakin city pillar festival · Chiang Mai · 15 May – 12 Jun (usually)
- Bangkok Pride · Bangkok · 28 May – 10 Jun (usually)
Seasons in force
Peak crowds at 4 of Thailand's 12 well-known places this month.