Eastern, Northeastern, Southern Regions at Risk
Thailand is bracing for significant rainfall through June 21, 2025, with the Thai Meteorological Department warning of heavy downpours in the eastern, northeastern, and southern regions. A strengthening southwesterly monsoon over the Andaman Sea and Gulf of Thailand, combined with a low-pressure system in northern Vietnam, is driving the surge, raising concerns about flash flooding and related hazards, as reported on June 20, 2025.
Regional Weather Breakdown
Thunderstorms Dominate Key Areas
The northeastern region faces thunderstorms across 60% of its area, with heavy rain expected in provinces like Nong Khai, Udon Thani, and Ubon Ratchathani, where temperatures will range from 24–36°C. The eastern region, including Chanthaburi and Trat, and the southern west coast, notably Phuket and Ranong, are also set for intense showers. Residents are urged to prepare for potential disruptions due to accumulated rainfall.
Southern Coast Faces High Waves
Maritime Safety Concerns Rise
The southern regions, particularly the west coast from Phuket to Satun, will see thunderstorms in 70% of areas, with wave heights in the Andaman Sea reaching 1–2 meters, exceeding 2 meters during storms. The east coast, including Surat Thani and Songkhla, faces similar conditions. The Meteorological Department advises small boats to avoid storm-prone waters, emphasizing caution to prevent maritime accidents.
Bangkok Under Storm Threat
Capital Prepares for Evening Rain
Bangkok and its surrounding provinces are forecast to experience thunderstorms in 60% of the area, primarily in the afternoon and evening, with temperatures between 25–38°C. The capital, which saw flooding in May 2025, is on alert for potential waterlogging. Authorities are monitoring drainage systems to mitigate impacts, urging residents to stay updated on weather alerts and avoid flood-prone zones.
Northern and Central Regions Affected
Scattered Storms Expected
The northern region, including Chiang Mai and Phitsanulok, will see thunderstorms in 40% of its area, with milder conditions compared to the south. The central region, covering Kanchanaburi and Samut Sakhon, expects storms in 60% of areas, with highs up to 37°C. Both regions face risks of localized flooding, prompting officials to issue warnings for rural and urban communities alike.
Precautions Urged for Safety
Flash Flood Risks Highlighted
Authorities are calling on residents in high-risk areas to remain vigilant, as heavy rainfall could trigger flash floods, landslides, and traffic disruptions. The Meteorological Department recommends securing property, avoiding low-lying areas, and monitoring updates via official channels. With Thailand’s monsoon season intensifying, proactive measures are critical to minimizing damage and ensuring public safety.
Long-Term Weather Outlook
Monsoon Activity to Persist
The current weather pattern, driven by a robust monsoon and regional low-pressure systems, is expected to persist, potentially affecting Thailand’s agriculture, tourism, and infrastructure. Past floods, like those in Bangkok in May 2025, underscore the need for resilient urban planning. As the nation prepares for more rain, coordination between local governments and communities will be key to managing the monsoon’s impact.
