Thailand’s Meteorological Department issued a severe weather warning on July 27, 2026, forecasting heavy to torrential rains across the northeastern, central, eastern, and southern regions. The advisory remains in effect through July 30, prompting maritime warnings for the Andaman Sea and the Gulf of Thailand.
Weather officials issued alerts regarding a strong monsoon trough moving across northern and upper northeastern Thailand. According to Meteorological Department Director-General Sukanyanee Yavinchai, the strengthening southwest monsoon over the Andaman Sea, Thailand, and the Gulf of Thailand is driving the severe conditions.
Regional Impact and Four-Day Rain Forecasts
The active weather system brings widespread heavy downpours that will persist for four days, lasting until July 30, as detailed in agency bulletins. The heaviest rainfall is expected to concentrate in the northeastern, central, eastern, and southern western coastal areas. The official announcement, designated as Announcement No. 8 (135/2569) and issued on July 27, 2026, at 05:00 hours by Meteorological Department Director-General Sukanyanee Yavinchai, states that the Department will issue its next announcement on July 27, 2026, at 17:00 hours.
Residents living near foothills, natural waterways, and low-lying zones face elevated risks. Specifically warning citizens to watch for flash floods and water runoff, especially in sloping areas near waterways and low-lying areas, as cumulative rainfall totals may cause sudden flash floods and forest runoffs.
Maritime Warnings and Small Boat Restrictions
Coastal conditions remain hazardous. The upper Andaman Sea experiences wave heights between 2 and 3 meters, which can exceed 3 meters in areas experiencing thundershowers.
Meanwhile, the upper Gulf of Thailand and the lower Andaman Sea record waves around 2 meters high, climbing past 2 meters during thunderstorms. Authorities advise all vessels operating in the Andaman Sea and Gulf of Thailand to proceed with extreme caution and steer clear of storm cells, specifically instructing mariners to navigate with caution and avoid sailing in areas with thunderstorms.
Official safety guidelines instruct operators of small boats along the upper Andaman Coast to remain ashore during the advisory period to prevent maritime accidents, noting that small boats in the upper Andaman Sea should refrain from leaving the shore during these days.
Public Safety and Contact Channels
Government agencies urge citizens to adjust travel itineraries and monitor daily schedules carefully while the severe weather advisory remains active, advising the public to carefully plan their lives and travel during this period for safety and to minimize potential impacts. Real-time updates and localized warnings continue to stream through the official Meteorological Department portal at http://www.tmd.go.th, alongside dedicated telephone assistance lines operating around the clock at 0-2399-4012-13 and 1182.
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