Thai Meteorological Department Alerts Heavy Rain, Flash Flood Risk
The Thai Meteorological Department warned of thunderstorms across 30 provinces, with heavy rain and flash‑flood risks in the south. A cold air mass from China and a monsoon trough are driving easterly winds and rough seas over the Gulf of Thailand and Andaman Sea. Temperatures nationwide range from 20‑35 °C, with the north seeing the coolest lows.
The Thai Meteorological Department's 24‑hour forecast issued on 12 October 2026 predicts thunderstorms across 30 provinces, with heavy rain in isolated spots. In the north, about 20% of the area will see thunderstorms, chiefly in Mae Hong Son, Chiang Mai, Tak, Kamphaeng Phet, Phitsanulok and Phichit; temperatures will range from 20‑25°C lows to 32‑34°C highs with easterly winds of 10‑20 km/h. The northeast will also have 20% coverage, mainly over Nakhon Ratchasima, Buriram, Surin, Si Sa Ket and Ubon Ratchathani, with lows of 20‑24°C, highs of 32‑35°C and northeast winds of 10‑25 km/h. Central Thailand expects thunderstorms over 30% of its area, focusing on Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram; lows 22‑25°C, highs 30‑34°C and northeast winds 10‑20 km/h. The eastern region will have 30% coverage, mainly Chonburi, Rayong, Chanthaburi and Trat; lows 23‑26°C, highs 32‑35°C, northeast winds 10‑30 km/h, seas generally under one metre but exceeding two metres in thunderstorm zones. Southern Thailand’s eastern seaboard (Phatthalung, Songkhla, Yala, Narathiwat, Nakhon Si Thammarat) will see 70% coverage with heavy rain in places; lows 21‑25°C, highs 30‑35°C, variable winds 10‑30 km/h, seas under one metre but over two metres in stormy areas. The western seaboard (Phuket, Krabi, Trang, Satun) likewise has 70% coverage with heavy rain locally; lows 23‑25°C, highs 32‑34°C, winds 15‑30 km/h, seas about one metre but exceeding two metres where thunderstorms occur. Bangkok and its vicinity will have 30% thunderstorm coverage, lows 25‑27°C, highs 33‑35°C, northeast winds 10‑20 km/h. The department urges the public, especially in the south, to guard against flash floods and overflowing streams, and advises mariners to exercise caution and avoid navigating in thunderstorm‑affected waters.
