The Thai Meteorological Department has issued a weather warning for 36 provinces today, cautioning residents of heavy rainfall affecting 60% of areas, including Bangkok and its vicinity. Flash floods and forest runoff are the main concerns.
The warnings are driven by a moderate southwest monsoon covering the upper Andaman Sea and Thailand, combined with southern and southeastern winds drawing moisture from the South China Sea. An area of low pressure over northern Vietnam is also contributing to the conditions.
Residents are urged to watch for sudden floods and forest runoff, particularly in mountainous and low-lying areas. Health precautions are advised as the weather continues to shift.
North
Thunderstorms are expected across 60% of northern Thailand from 6am today to 6am tomorrow, with heavy rain in Mae Hong Son, Chiang Mai, Lamphun, Tak, Kamphaeng Phet, Phichit, Phitsanulok, and Phetchabun. Temperatures will range from 23 to 25°C at the low end to 33 to 36°C at the high end, with southwest winds at 10 to 20 km/h.
Northeast
Some 40% of northeastern areas will see thunderstorms, with heavy rain in Loei, Nong Khai, Bueng Kan, Udon Thani, and Sakon Nakhon. Temperatures are forecast between 24 to 25°C and 34 to 36°C.
Central
Thunderstorms will cover 60% of central Thailand, mainly in Nakhon Sawan, Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Songkhram, Samut Sakhon, and Phra Nakhon Si Ayutthaya. Temperatures are predicted between 24 to 26°C and 34 to 36°C, with southwest winds at 10 to 20 km/h.
East
Thunderstorms will affect 60% of the eastern region with heavy rain in Nakhon Nayok, Prachin Buri, Chachoengsao, Chon Buri, Rayong, Chanthaburi, and Trat. Temperatures will sit between 25 to 27°C and 30 to 35°C. Southwest winds will reach 20 to 35 km/h, with waves around two metres in stormy areas.
South (eastern coast)
Thunderstorms will hit 60% of the eastern southern coast, with heavy rain in Phetchaburi, Prachuap Khiri Khan, Chumphon, and Surat Thani. Temperatures will range from 24 to 26°C to 34 to 36°C, with southwest winds at 15 to 35 km/h and waves of one to two metres.
South (western coast)
The western coast will bear the brunt, with thunderstorms affecting 70% of the region and heavy rain in Ranong, Phang Nga, Phuket, and Krabi. Temperatures will range from 23 to 26°C to 32 to 35°C. From Phuket northward, southwest winds will reach 20 to 35 km/h with two-metre waves; from Krabi southward, winds will be 15 to 35 km/h with waves of one to two metres, rising during storms.
Bangkok
The capital and surrounding areas will see thunderstorms covering 60% of the area. Temperatures will range from 24 to 26°C to 34 to 35°C, with southwest winds at 10 to 20 km/h.
At sea
Moderate winds are expected across the Andaman Sea and the Gulf of Thailand. The upper Andaman Sea and upper Gulf of Thailand will see waves around two metres, while the lower sections will see one to two metres. Waves may exceed two metres in stormy areas. Seafarers are advised to navigate with caution and avoid sailing in stormy conditions.
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