Today's Weather: Meteorology Department Names 36 Provinces Under Monsoon Storm Alert with Heavy to Very Heavy Rainfall
Thailand's Meteorology Department placed 36 provinces under monsoon storm alert on May 21, warning of heavy to very heavy rainfall nationwide with flash flooding risks, particularly along the western coastal south and upper regions due to a
The Thai Meteorology Department issued a 24-hour weather forecast on May 21, 2025, warning of continued rainfall nationwide with heavy downpours in some areas, especially the western coastal southern region due to a strong southwest monsoon over the upper Andaman Sea combined with low-pressure systems over the lower northern and upper northeastern regions. Public warning issued for dangers from heavy to very heavy rainfall and accumulated water, which may cause flash flooding and flash floods, particularly in hillside areas near water channels and low-lying areas. Citizens are advised to monitor their health during changing weather conditions.
Andaman Sea conditions in the upper region show relatively strong winds with waves 2-3 meters high, exceeding 3 meters in thunderstorm areas. The lower Andaman Sea and upper Gulf of Thailand have waves approximately 2 meters high, exceeding 2 meters in thunderstorm areas. Fishermen are advised to exercise caution and avoid thunderstorm zones; small boats in the upper Andaman Sea should remain ashore.
Regional forecasts (06:00 today to 06:00 tomorrow):
Northern Region: Thunderstorms in 60 percent of areas with heavy rainfall in Nan, Uttaradit, Sukhothai, Tak, Kamphaengphet, Phichit, Phitsanulok, and Phetchabun. Low 23-26°C, high 32-37°C. Southwest winds 10-20 km/h.
Northeastern Region: Thunderstorms in 60 percent of areas with heavy rainfall in Loei, Nong Khai, Bueng Kan, Nongbualamphú, Udon Thani, Sakon Nakhon, and Nakhon Phanom. Low 23-25°C, high 31-35°C. Southwest winds 10-20 km/h.
Central Region: Thunderstorms in 60 percent of areas with heavy rainfall in Nakhon Sawan, Uthai Thani, Chai Nat, Suphan Buri, Kanchanaburi, and Ratchaburi. Low 24-27°C, high 33-36°C. Southwest winds 10-20 km/h.
Eastern Region: Thunderstorms in 60 percent of areas with heavy rainfall in Rayong, Chanthaburi, and Trat. Low 24-29°C, high 32-36°C. Southwest winds 20-35 km/h. Sea waves approximately 2 meters, exceeding 2 meters in thunderstorm areas.
Southern Region (Eastern Coast): Thunderstorms in 60 percent of areas with heavy rainfall in Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, and Songkhla. Low 24-26°C, high 31-36°C. From Surat Thani northward: Southwest winds 20-35 km/h, waves approximately 2 meters offshore, exceeding 2 meters in thunderstorm areas. From Nakhon Si Thammarat southward: Southwest winds 15-35 km/h, waves 1-2 meters, approximately 2 meters offshore, exceeding 2 meters in thunderstorm areas.
Southern Region (Western Coast): Thunderstorms in 70 percent of areas with heavy rainfall in many areas of Phuket, Krabi, Trang, and Satun, with very heavy rainfall in some areas of Ranong and Phang Nga. Low 23-26°C.
