39 Provinces Brace for Heavy Rain, Rough Seas Through July 15
Heavy rain and rough seas are expected across 39 Thai provinces through July 15 as a strengthening southwest monsoon and low-pressure system bring flash flood and landslide risks, particularly to the South and Northeast.
Thailand's Meteorological Department forecasts continued heavy rainfall across 39 provinces over the next 24 hours, with increased precipitation expected in the South. The North, Northeast, and East regions will experience scattered heavy downpours due to a strengthening southwest monsoon over the Andaman Sea, Thailand's waters, and the Gulf of Thailand, combined with a low-pressure system hovering over northern Vietnam. Residents in affected areas are warned of dangers from heavy and accumulated rainfall that could trigger flash floods and landslides, particularly in hilly terrain and low-lying areas.
Wave conditions are intensifying across the Andaman Sea and Gulf of Thailand. The upper Andaman Sea is experiencing relatively strong winds with waves 2–3 meters high, exceeding 3 meters during thunderstorms. The lower Andaman Sea and upper Gulf of Thailand have waves around 2 meters, rising above 2 meters in thunderstorm zones. Fishermen are advised to exercise caution and avoid thunderstorm areas, with small boats in the upper Andaman Sea instructed to remain ashore through July 15.
Separately, Typhoon Bavi, currently in the Pacific Ocean, is expected to pass through Taiwan and make landfall on China's eastern coast between July 11–12. The typhoon will not impact Thailand, though travelers to affected regions should monitor weather conditions before departing.
Detailed regional forecasts include: Northern region with 60% thunderstorm coverage and heavy rain in Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, and Nan provinces; temperatures 22–26°C low, 29–32°C high; southwest winds 10–20 km/h. Northeast region with 40% thunderstorms and heavy rain in Nong Khai, Bueng Kan, Sakon Nakhon, and Nakhon Phanom; temperatures 23–26°C low, 30–34°C high; southwest winds 10–20 km/h. Central region with 40% thunderstorms in Uthai Thani, Nakhon Sawan, Ayutthaya, Lopburi, Saraburi, Kanchanaburi, and Ratchaburi; temperatures 24–26°C low, 35–36°C high; southwest winds 10–25 km/h. Eastern region with 40% thunderstorms and heavy rain in Rayong, Chanthaburi, and Trat; temperatures 24–28°C low, 32–34°C high; southwest winds 20–35 km/h; waves approximately 2 meters, exceeding 2 meters in thunderstorm areas. Southern region (east coast) with 30% thunderstorms mainly in Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Yala, and Narathiwat; temperatures 23–26°C low, 33–36°C high; waves 1–2 meters near shore, 2 meters offshore, exceeding 2 meters during thunderstorms.
