Thailand in September
September is Thailand's weakest month (rank 12 of 12): its 19 destinations average 57/100, led by Ko Samui at 73 — 37°C and 22 rainy days — while Ko Tao is cooler at 31°C and scores 70.
#12 of 12 months for Thailand · 19 destinations · updated September 2026 · climate normals from ERA5 reanalysis
🇹🇭 Thailand, month by month
57/100 in SeptemberWhere in Thailand in September
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 September 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 September
- Full Moon Party · Ko Pha Ngan · 1 Jan – 31 Dec
- Waterfalls at full flow · Chiang Mai · 1 Aug – 15 Oct (usually)
- Erawan falls at full flow · Kanchanaburi · 15 Sep – 31 Dec (usually)
Seasons in force
Peak crowds at 1 of Thailand's 12 well-known places this month.