"Meteorological Department" warning The Meteorological Department warns that from 13-19 August 2026, Thailand will still experience heavy rain in some areas, which may cause flash floods, flash floods from mountain streams, and river overflows.
13 August 2026Meteorological DepartmentThe 24-hour weather forecast states, "Thailand will continue to have heavy rain in some areas of the north, upper northeast, central, and east due to a monsoon trough stretching across the upper north, Laos, and upper Vietnam. This combines with the southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand with fairly strong intensity. Residents in these areas are advised to be cautious of heavy and accumulated rain that may cause flash floods and flash floods from mountain streams, especially in foothill areas near waterways and lowlands."
Winds and waves in the upper Andaman Sea and upper Gulf of Thailand remain fairly strong, with waves 2-3 meters high; in areas with thunderstorms, waves may exceed 3 meters. Mariners are advised to navigate cautiously and avoid sailing in thunderstorm areas. Small boats in the upper Andaman Sea and upper Gulf of Thailand should refrain from setting out to sea.
7-day weather forecast: From 13 to 19 August 2026, Thailand will continue to experience heavy rain in some parts of the north, northeast, central, east, and western southern regions due to a monsoon trough over the upper north and upper northeast. Meanwhile, the southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand remains fairly strong.
During 13-19 August 2026, winds and waves in the upper Andaman Sea will remain fairly strong with waves 2-3 meters high; in areas with thunderstorms, waves exceed 3 meters. The upper Gulf of Thailand will have waves about 2 meters high. The lower Andaman Sea and lower Gulf of Thailand will have waves 1-2 meters high; in thunderstorm areas, waves exceed 2 meters. Afterwards, winds and waves in the upper Andaman Sea will weaken, with waves about 2 meters high; in thunderstorm areas, waves exceed 2 meters.
Precautions: Residents in Thailand should be cautious of heavy and accumulated rainfall, which may cause flash floods, flash floods from mountain streams, and river overflows, especially in foothill areas near waterways and lowlands. Mariners in the Gulf of Thailand and Andaman Sea should navigate cautiously and avoid sailing in thunderstorm areas throughout this period. Small boats in the upper Andaman Sea should refrain from setting sail from 13 to 17 August 2026.".