Thailand weather warning: Strong winds, rough seas and heavy rain expected in July

The Thai Meteorological Department has advised residents and travellers to exercise caution as intensified monsoon conditions are expected to bring heavy rainfall, flash flood, risks and dangerous sea conditions across several regions.

Thailand is expected to experience stronger monsoon conditions from 13 to 15 July 2026, with 'heavy' to 'very heavy' rainfall forecast in parts of the country and rough sea conditions in the Andaman Sea and upper Gulf of Thailand, according to a press release by the Thai Meteorological Department.

In its announcement, the department said the southwest monsoon covering the Andaman Sea, Thailand and the Gulf of Thailand would intensify during this period.

The stronger monsoon is expected to bring strong winds and rough seas across the upper Andaman Sea, where waves could reach 2-4m in height and exceed four metres in areas experiencing thunderstorms.

In the upper Gulf of Thailand and lower Andaman Sea, waves are expected to reach 2-3m, with heights exceeding 3m in areas affected by thunderstorms.

The department has advised mariners operating in the Andaman Sea and Gulf of Thailand to navigate with caution and avoid sailing in areas with thunderstorms. Small boats have also been advised to remain ashore during this period due to the hazardous sea conditions.

Heavy to very heavy rainfall is also expected between 13 and 14 July 2026 in parts of western Southern Thailand, western Central Thailand, and the Eastern region.

The provinces expected to be most affected include Ranong, Phang Nga, Chanthaburi, Trat, and Kanchanaburi.

Residents in these areas have been warned to remain alert to the risks associated with heavy rainfall and accumulated rain, which could lead to flash floods and landslides, particularly in areas near slopes, waterways and low-lying areas.

The department also noted that Tropical Storm “Bavi”, currently located over Anhui Province, China, is expected to weaken into a tropical depression before becoming a strong low-pressure system.

While the storm is not expected to move towards Thailand or directly affect the country’s weather, it is expected to strengthen the southwest monsoon affecting Thailand.

The Thai Meteorological Department also provided an update on Facebook on recent earthquake activity recorded between 12 and 13 July 2026.

Earthquake events measuring magnitudes 2.4 and 3.9 were detected with epicentres located in Myanmar, while a magnitude 1.8 earthquake was recorded in Nam Phrae Subdistrict, Phrao District, Chiang Mai Province. A magnitude 4.6 earthquake was also detected in the northern part of Sumatra Island, Indonesia.

The department confirmed that these earthquake events had no impact on Thailand.

Members of the public planning travel during this period have been advised to check weather updates before departure and monitor announcements from the Thai Meteorological Department.

Members of the public are also encouraged to continue monitoring official weather updates and follow safety advice during this period.

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Infographic / Thai Meteorological Department Facebook