El Nino Watch
Thailand floods today: disaster areas, incidents reported with sources, measured heavy rain and river levels in all 77 provinces, and what it means for Samui.
Thailand national level 3/4 (Act) on 27 Sep 2026 06:24 ICT; disaster area declared in Bangkok (reported by 24 outlets); 13 provinces at level 3, most reported: Bangkok (Don Mueang Airport), Chon Buri (Sri Racha, Pattaya, Sattahip), Pathum Thani (Rangsit), Saraburi, Phra Nakhon Si Ayutthaya; flooding reported in 37 provinces (16 with evacuations, deaths or disaster zones reported); 527 gauges >= 35.1 mm in 24 h, max 274.4 mm at NAKORNNAYOK (Nakhon Nayok) at 27 Sep 04:00 ICT; TMD heavy-rain bulletin 229/2569 in force until 27 Sep.
The most affected provinces (level 3: Rayong 397 km, Trat 410 km, Chon Buri 424 km, Chanthaburi 433 km, Bangkok 472 km, Pathum Thani 505 km and 7 more; straight-line distance from Maenam, Koh Samui) are at least 397 km away. Closer to the island: Ranong (148 km, level 2: very heavy rain: 122.5 mm in 24 h at บ้านหินซอง). None of this floods Koh Samui directly: the island's own risk is on the Samui page. It DOES affect travel: Bangkok, Samut Prakan are on the way on / off the island (flights via Bangkok BKK / DMK, bus and train via Surat Thani, ferries from Donsak).
Updated 26 Sep 2026 23:24 UTC.
| Province | Level | Disaster area declared | Max 24 h rain | Max river level (% of bank) | Why |
|---|---|---|---|---|---|
| Chon Buri | act | no | 55.4 mm | 70 % | Sri Racha: evacuation / deaths / disaster zone reported (3 outlets); Pattaya: flooding reported (5 outlets); Chon Buri: flooding reported (3 outlets). |
| Pathum Thani | act | no | 124.8 mm | 118 % | Rangsit: evacuation / deaths / disaster zone reported (4 outlets); Pathum Thani: evacuation / deaths / disaster zone reported (1 outlet); very heavy rain: 124.8 mm in 24 h at Rabibadhana West Section. |
| Bangkok | act | yes | 115.5 mm | 122 % | disaster declaration reported by 24 outlets; Bangkok: evacuation / deaths / disaster zone reported (49 outlets); Don Mueang Airport: flooding reported (6 outlets). |
| Trat | act | no | 187.0 mm | 115 % | Trat: evacuation / deaths / disaster zone reported (2 outlets); very heavy rain: 187.0 mm in 24 h at บ้านหมื่นด่าน; 4 river/canal station(s) over the bank (max 115 % at Khlong Sano). |
| Saraburi | act | no | 123.4 mm | 86 % | Saraburi: evacuation / deaths / disaster zone reported (4 outlets); very heavy rain: 123.4 mm in 24 h at National Park Protection Unit at Nor Sor. 1 (Kaplang Crayfish); river/canal near the bank (86 % at Khlong Chon Bridge (Ban Sang Sok)). |
| Phra Nakhon Si Ayutthaya | act | no | 122.6 mm | 121 % | Phra Nakhon Si Ayutthaya: evacuation / deaths / disaster zone reported (4 outlets); very heavy rain: 122.6 mm in 24 h at Sena; 8 river/canal station(s) over the bank (max 121 % at สะพานหัวเวียง). |
| Rayong | act | no | 119.0 mm | 114 % | Rayong: evacuation / deaths / disaster zone reported (3 outlets); very heavy rain: 119.0 mm in 24 h at KhaoChaMao-KhaoWong National Park; 2 river/canal station(s) over the bank (max 114 % at Mueang Klaeng). |
| Chanthaburi | act | no | 117.8 mm | 142 % | Chanthaburi: evacuation / deaths / disaster zone reported (4 outlets); very heavy rain: 117.8 mm in 24 h at Na Yai Am; 6 river/canal station(s) over the bank (max 142 % at Kaeng Hang Maeo). |
| Ang Thong | act | no | 81.4 mm | 89 % | Ang Thong: evacuation / deaths / disaster zone reported (3 outlets); heavy rain: 81.4 mm in 24 h at Khlong Chon Bridge (Ban Talat Mai); river/canal near the bank (89 % at Chao Phraya 8). |
| Sing Buri | act | no | 47.2 mm | 92 % | Sing Buri: evacuation / deaths / disaster zone reported (2 outlets); heavy rain: 47.2 mm in 24 h at Bang Rachan Gate; river/canal near the bank (92 % at Chao Phraya 7). |
| Chai Nat | act | no | 39.0 mm | 102 % | Chai Nat: evacuation / deaths / disaster zone reported (3 outlets); 1 river/canal station(s) over the bank (max 102 % at Chao Phraya 4); heavy rain: 39.0 mm in 24 h at T.ปตร.พลเทพ. |
| Sa Kaeo | act | no | 37.0 mm | 149 % | Sa Kaeo: evacuation / deaths / disaster zone reported (3 outlets); 6 river/canal station(s) over the bank (max 149 % at บ้านแก้ง); heavy rain: 37.0 mm in 24 h at Bang Pakong Basin Watershed Conservation Development Study Center. |
| Phetchabun | act | no | 28.0 mm | 107 % | Phetchabun: evacuation / deaths / disaster zone reported (3 outlets); 2 river/canal station(s) over the bank (max 107 % at Pa Sak 3). |
| Samut Prakan | prepare | no | 33.0 mm | 125 % | Samut Prakan: evacuation / deaths / disaster zone reported (1 outlet); Suvarnabhumi Airport: flooding reported (2 outlets); 2 river/canal station(s) over the bank (max 125 % at Wat Bangkachao Nok Gate). |
| Nonthaburi | prepare | no | 65.6 mm | 98 % | Nonthaburi: flooding reported (2 outlets); Pak Kret: flooding reported (1 outlet); heavy rain: 65.6 mm in 24 h at Phra Pimol Sai Noi. |