"Meteorological Department" The 24-hour weather forecast for Thailand indicates continued heavy rain in some areas, warning the public to be cautious of dangers from accumulated rainfall that may cause flash floods and mudslides.
11 August 2026 GMT+7Meteorological DepartmentThe 24-hour weather forecast states that Thailand will still have heavy rain in some areas due to a monsoon trough passing over the upper northern region, entering a low-pressure area over northern Vietnam and northern Laos. Additionally, a rather strong southwest monsoon is covering the Andaman Sea, Thailand, and the Gulf of Thailand. Residents in these areas are advised to be cautious of heavy and accumulated rainfall, which may cause flash floods and mudslides, especially in foothill areas near waterways and lowlands.
Regarding sea conditions, the upper Andaman Sea and upper Gulf of Thailand have rather strong winds with waves 2-3 meters high; in areas with thunderstorms, waves exceed 3 meters. Mariners should navigate carefully and avoid sailing in areas with thunderstorms. Small boats in the upper Andaman Sea and upper Gulf of Thailand are advised to remain ashore.
7-day weather forecast
From 11 to 14 August 2026, Thailand will experience heavy rain in some areas due to a monsoon trough crossing Myanmar, the upper northern region, and northern Laos, extending into a low-pressure area over northern Vietnam. A rather strong southwest monsoon covers the Andaman Sea, Thailand, and the Gulf of Thailand.
From 15 to 17 August 2026, heavy rain will persist in some areas of northern, northeastern, central, eastern, and western southern Thailand due to a monsoon trough passing through the upper northern region and northern Laos, combined with a rather strong southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand.
From 11 to 16 August 2026, the upper Andaman Sea will continue to have rather strong winds 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 areas with thunderstorms, waves exceed 2 meters.
Precautions: The public in Thailand should be aware of dangers from heavy and accumulated rainfall, which may cause flash floods, mudslides, 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 areas with thunderstorms throughout this period. Small boats in the upper Andaman Sea should refrain from going out to sea from 11 to 16 August 2026.