Weather Advisory
Subject: Heavy to very heavy Rain in Thailand
Strong wind-waves in the Andaman Sea and the upper Gulf
(Effect during 19-24 July 2025)
No.3 (183/2025)
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During 19–24 July 2025, the monsoon through will lie across the upper North of Thailand upper Laos and upper Vietnam. Meanwhile, the rather strong southwest monsoon prevails across the Andaman Sea, Thailand and the Gulf with more rains and isolated heavy to very heavy rain in Thailand. People in the country should beware of heavy to very heavy rain and accumulation that may cause flash floods and overflows especially along the waterways near foothills and lowlands.
Affected areas are as followings
On 19 July 2025
Northeast: Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Mukdahan, Yasothon,
Amnat Charoen and Ubon Ratchathani.
Central: Kanchanaburi and Ratchaburi.
East: Nakhon Nayok, Prachin Buri, Chanthaburi and Trat.
South: Ranong, Phang Nga, Phuket, Krabi and Trang.
During 20 - 21 July 2025
North: Mae Hong Son, Chiang Rai, Lampang, Phayao, Nan, Phrae, Uttaradit, Sukhothai, Tak,
Phitsanulok and Phetchabun.
Northeast: Loei, Nong Bua Lamphu, Udon Thani, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom,
Mukdahan, Maha Sarakham, Kalasin, Yasothon, Amnat Charoen, Sisaket and Ubon Ratchathani.
Central: Uthai Thani, Lopburi, Saraburi, Kanchanaburi, Ratchaburi, Chainat, Phra Nakhon Si Ayutthaya, Samut Songkhram,
Nakhon Pathom, including Bangkok and its vicinity.
East: Nakhon Nayok, Prachin Buri, Chanthaburi and Trat.
South: Phetchaburi, Prachuap Khiri Khan, Chumphon, Ranong, Phang Nga, Phuket, Krabi and Trang.
During 22 - 24 July 2025
North: Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan, Phrae, Uttaradit,
Sukhothai, Phitsanulok, Phichit, Phetchabun, Kamphaeng Phet, and Tak.
Northeast: Loei, Nong Bua Lamphu, Udon Thani, Nong Khai, Bueng Kan, Sakon Nakhon, Nakhon Phanom,
Chaiyaphum, Kalasin, Mukdahan, Yasothon, Amnat Charoen, Nakhon Ratchasima and
Ubon Ratchathani.
Central: Nakhon Sawan, Uthai Thani, Chainat, Singburi, Ang Thong, Suphan Buri, Lopburi, Saraburi, Kanchanaburi,
Ratchaburi and Phra Nakhon Si Ayutthaya.
East: Nakhon Nayok, Prachin Buri, Rayong, Chanthaburi and Trat.
South: Phetchaburi, Prachuap Khiri Khan, Ranong and Phang Nga.
The rather strong wind forces the waves in the Andaman Sea and the upper Gulf up to 2-3 meters high and above 3 meters high in thundershowers. All ships in the Andaman Sea and the Gulf should proceed with caution and keep off thundershowers, small boats in the Andaman Sea and the upper Gulf should keep ashore during this period.
In addition, the tropical depression over eastern Philippines was intensify into the tropical storm “Wipha”. It is forecast to move pass upper Philippines into the upper South China Sea during 19-22 July 2025, leading to the moderate southwest monsoon prevailing over the Andaman Sea, Thailand and the Gulf will strengthen.
This advisory is in effect on 18 July 2025, at 5.00 a.m.
This next issue will be on 18 July 2025, at 5.00 p.m.
(Signed) Sugunyanee Yavinchan
(Miss Sugunyanee Yavinchan)
Director-General
Thai Meteorological Department
