Heavy Rain Expected Nationwide, South Sees 30% Drop
Heavy rain is expected across northern, northeastern, and eastern Thailand over the next 24 hours, with the south seeing a 30% drop due to the southwest monsoon. Flash floods are possible in hilly areas and low-lying zones nationwide.
The Meteorological Department issued a weather forecast for the next 24 hours on July 16, 2025. The northern, northeastern, and eastern regions will experience heavy rain in some areas, while the southern region will see decreased rainfall due to a moderate southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand. A low-pressure system is over northern Vietnam. Residents in northern Thailand should be alert to dangers from heavy and accumulated rainfall, which may cause flash floods and flash flooding, especially in hillside areas near water channels and low-lying areas. Winds and waves in the upper Andaman Sea and upper Gulf of Thailand will be moderate, with waves around 2 meters high, while lower areas will have 1-2 meter waves, with thunderstorm zones exceeding 2 meters. Mariners should navigate with caution and avoid thunderstorm areas.
Detailed forecast by region from 06:00 today to 06:00 tomorrow:
Northern Region: 40 percent thunderstorms with heavy rain in some areas, particularly Maehongson, Tak, Phitsanulok, and Phetchabun provinces. Low temperatures 23-25°C, highs 32-35°C. Southwest winds 10-20 km/h.
Northeastern Region: 40 percent thunderstorms with heavy rain in some areas, particularly Buengkan, Sakon Nakhon, Nakhon Phanom, Mukdahan, Amnat Charoen, and Ubon Ratchathani. Lows 23-26°C, highs 33-35°C. Southwest winds 10-20 km/h.
Central Region: 40 percent thunderstorms, mostly in Nakhon Sawan, Uthai Thani, Chai Nat, Suphan Buri, Phra Nakhon Si Ayutthaya, Saraburi, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Songkhram, and Samut Sakhon. Lows 24-26°C, highs 34-36°C. Southwest winds 10-20 km/h.
Eastern Region: 60 percent thunderstorms with heavy rain in some areas, particularly Nakhon Nayok, Prachuap Khiri Khan, Chachoengsao, Chanthaburi, and Trat. Lows 23-28°C, highs 31-34°C. Southwest winds 20-35 km/h. Seas with 2-meter waves, exceeding 2 meters in thunderstorm areas.
Southern Region (East Coast): 30 percent thunderstorms, mostly in Chumphon, Surat Thani, Nakhon Si Thammarat, Pattani, Yala, and Narathiwat. Lows 23-25°C, highs 33-34°C. From Surat Thani northward: southwest winds 20-35 km/h with 1-2 meter waves offshore and around 2 meters near shore. Thunderstorm areas see waves exceeding 2 meters. From Nakhon Si Thammarat southward: southwest winds 15-35 km/h with 1-meter waves near shore and 1-2 meter waves offshore, exceeding 2 meters in thunderstorm areas.
Southern Region (West Coast): 40 percent thunderstorms, mostly in Ranong, Phang Nga, Phuket, and Krabi. Lows 23-25°C, highs 32-34°C. From Phuket northward: southwest winds 20-35 km/h with 2-meter waves, exceeding 2 meters in thunderstorm areas. From Krabi southward: southwest winds 15-35 km/h with 1-2 meter waves, exceeding 2 meters in thunderstorm areas.
