BANGKOK — 14 June 2026, Thailand’s Meteorological Department has warned of heavy rain in several regions on 15 June 2026, with risks of flash floods and forest runoff in vulnerable areas.
In its 24-hour forecast issued on 14 June 2026, the department said thunderstorms are expected across much of the country, with isolated heavy rainfall in parts of the North, upper Northeast and East.
The weather conditions are being influenced by a moderate southwest monsoon covering the Andaman Sea, Thailand and the Gulf of Thailand, combined with a low-pressure system over northern Vietnam.
Authorities urged residents in at-risk areas to remain alert for heavy rainfall and accumulated runoff, particularly near waterways, foothills and low-lying areas prone to flooding.
Provinces at Risk of Heavy Rain
North
Thunderstorms are forecast in 60 percent of the region, with heavy rain possible in:
- Mae Hong Son
- Chiang Mai
- Chiang Rai
- Nan
- Tak
- Phitsanulok
Northeast
Thunderstorms are forecast in 40 percent of the region, with heavy rain possible in:
- Loei
- Nong Khai
- Bueng Kan
- Udon Thani
- Sakon Nakhon
- Nakhon Phanom
- Chaiyaphum
East
Thunderstorms are forecast in 40 percent of the region, with heavy rain possible in:
- Chanthaburi
- Trat
Southwest Coast
Thunderstorms are forecast in 40 percent of the region, with heavy rain possible in:
- Krabi
- Trang
- Satun
Marine Warning
Moderate winds are expected over the upper Andaman Sea, where waves are forecast at 1-2 metres. Waves in the lower Andaman Sea and the Gulf of Thailand are expected to reach around 1 metre, rising above 2 metres in areas experiencing thunderstorms.
The department advised mariners in the Andaman Sea and Gulf of Thailand to navigate with caution and avoid areas affected by thunderstorms.
Bangkok Forecast
Bangkok and surrounding provinces are expected to experience thunderstorms in 40 percent of the area during the forecast period.
Temperatures in the capital are expected to range between 26-28°C and 35-36°C.