Thailand 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
🇹🇭 Thailand, month by month
61/100 in MayWhere in Thailand in May
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)
- Visakha Bucha · Kanchanaburi and 1 more place · 5 May – 5 Jun (usually)
- Lychee Fair · Chiang Rai · 10–25 May (usually)
Seasons in force
Peak crowds at 4 of Thailand's 12 well-known places this month.