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Daily Weather Forecast
Announcement Date 21 August 2026
The monsoon trough move to lies across the upper North and the Laos into the tropical depression over Hainan, China while the rather strong southwest monsoon prevailing over the Andaman Sea, Thailand and the Gulf is weakening. Isolated heavy rains are forecast in Thailand and isolated very heavy rains are possible in the North and the Central. People in the areas should beware of heavy to very heavy rains and accumulation that may cause flash floods, overflows and landslides especially along the waterways near foothills and lowlands. The rather strong winds force the waves in the upper Andaman Sea up to be 2-3 meters high and above 3 meters high in thundershowers. In the lower Andaman Sea and the upper Gulf, the waves are expected about 2 meters high and above 2 meters high in thundershowers. All ships should proceed with caution and keep off thundershowers, small boats in the upper Andaman Sea keep ashore. In addtion, the active low-pressure cell over Hainan, China has developed to tropical depression. This storm is likely to make landfall over the South of Guangdong, China during 23-24 August 2026. This storm will not move to Thailand and no direct effect on Thailand’s weather. The travellers should check weather information before start the journey.
Announcement Date 21 August 2026
Northern
Scattered thundershowers and isolated heavy rain in Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Kamphaeng Phet, Phitsanulok and Phetchabun. Isolated very heavy rain in Tak. Minimum temperature 23-26 °C. Maximum temperature 30-33 °C. Southwesterly winds 10-20 km./hr.
Northeastern
Scattered thundershowers and isolated heavy rain in Nong Khai, Bueng Kan, Sakon Nakhon, and Nakhon Phanom. Minimum temperature 24-25 °C. Maximum temperature 29-34 °C. Southwesterly winds 10-20 km./hr.
Central
Scattered thundershowers and isolated heavy rain in Nakhon Sawan, Uthai Thani and Ratchaburi. Isolated very heavy rain in Kanchanaburi. Minimum temperature 23-25 °C. Maximum temperature 31-35 °C. Southwesterly winds at 10-25 km./hr.
Eastern
Scattered thundershowers and isolated heavy rain in Nakhon Nayok, Prachin Buri, Chanthaburi, and Trat. Minimum temperature 24-28 °C. Maximum temperature 31-34 °C. Southwesterly winds 20-35 km./hr. Wave height about 2 meters and above 2 meters in thundershowers.
Southern (East Coast)
Isolated thundershowers mostly in Prachuap Khiri Khan, Chumphon, and Surat Thani. Minimum temperature 23-25 °C. Maximum temperature 33-36 °C. From Surat Thani northward: Southwesterly winds 20-35 km./hr. Wave height 1-2 meters, about 2 meters offshore.and above 2 meters in thundershowers. From Nakhon Si Thammarat southward: Southwesterly winds 15-35 km./hr. Wave height about 1 meter, 1-2 meters offshore and above 2 meters in thundershowers.
Southern (West Coast)
Scattered thundershowers and isolated heavy rain in Ranong and Phang Nga. Minimum temperature 22-26 °C. Maximum temperature 29-35 °C. From Phang Nga northward: Southwesterly winds 20-40 km./hr. Wave height 2-3 meters and above 3 meters in thundershowers. From Phuket southward: Southwesterly winds 20-35 km./hr. Wave height about 2 meters and above 2 meters in thundershowers.
Bangkok Metropolitan
Scattered thundershowers. Minimum temperature 25-27 °C. Maximum temperature 34-35 °C. Southwesterly winds at 10-25 km./hr.
Announcement Date 21 August 2026
