Thailand Braces for Heavy Rain, Floods Through Late July
Thailand's meteorological department warns of heavy rain and potential flooding across the north, northeast, and southern regions through late July, with the eastern and western south coasts facing particularly severe conditions July 26–28
The Thai Meteorological Department issued a seven-day regional weather forecast for July 22–28, 2025. From July 22–25, heavy rain is expected in parts of the northern, upper northeastern, eastern, and western southern regions due to a low-pressure system over northern Vietnam combined with the southwest monsoon affecting the Andaman Sea, Thailand, and the Gulf of Thailand. Waves in the upper Andaman Sea and northern Gulf of Thailand will reach 1–2 meters, exceeding 2 meters in thunderstorm areas. The lower Andaman Sea will see approximately 1-meter waves, also exceeding 2 meters during storms. From July 26–28, the eastern and western southern regions face heavy to very heavy rain as a monsoon trough passes through Myanmar, Laos, and Vietnam into a low-pressure system in the central South China Sea, with strengthening southwest monsoon conditions. Waves will intensify across the Andaman Sea and Gulf of Thailand. A separate low-pressure system in the Pacific is expected to strengthen into a depression and move over the northern Philippines on July 24–25. Public warnings emphasize caution in eastern and western southern regions during July 26–28 for sudden flash floods, flash floods, and overflowing banks, particularly in foothill and low-lying areas near waterways. Regional forecasts detail thunderstorms at 40–80% coverage across all regions with heavy rain in parts. Northern region: 60–80% thunderstorm coverage with heavy rain July 22–25 and 28; low 23–27°C, high 29–36°C. Northeastern region: 40–60% thunderstorm coverage with scattered heavy rain throughout; low 24–26°C, high 30–37°C. Central region: 40–60% thunderstorm coverage with heavy rain in western areas July 22 and 27–28; low 24–27°C, high 30–37°C. Eastern region: July 22–25 sees 40–60% thunderstorm coverage; July 26–28 sees 60–70% coverage with heavy to very heavy rain in places; winds 15–35 kph initially, 20–35 kph later; waves 1–2 meters, exceeding 2 meters in storms; low 24–28°C, high 30–36°C. Southern region (east coast): July 22–25 shows 20–40% thunderstorm coverage with moderate winds and 1-meter waves offshore.
