The Disaster Prevention and Mitigation Department reported on August 16 that monsoon conditions will bring heavy to very heavy rainfall across northern Thailand between August 18-21, 2025, particularly in the North and Northeast regions due to a monsoon trough coupled with a strong southwestern monsoon over the Andaman Sea and Gulf of Thailand. The northern Andaman Sea will see rough conditions with waves 2-3 meters high, rising above 3 meters during thunderstorms. The lower Andaman Sea and northern Gulf of Thailand will experience waves around 2 meters, exceeding 2 meters in thunderstorm areas.

Seventeen northern provinces are on alert for flash floods, flash floods, mudslides, and water accumulation: Mae Hong Son, Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Phrae, Nan, Uttaradit, Tak, Sukhothai, Kamphaeng Phet, Phichit, Phetchabun, Nakhon Sawan, and Uthai Thani. Fifteen northeastern provinces including Loei, Nong Khai, Bueng Kan, Nong Bua Lamphu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Kalasin, Mukdahan, Roi Et, Yasothon, Amnat Charoen, Surin, Si Sa Ket, and Ubon Ratchathani are also at risk. Seven central provinces—Kanchanaburi, Ratchaburi, Saraburi, Nakhon Nayok, Prachuap Khiri Khan, Chachoengsao, and Trat—face similar threats.

Three southern provinces face strong wind warnings: Ranong (Muang, Kapoe, and Suksamran districts), Phang Nga (Kuraburi, Takua Pa, Thai Mueang, Takua Thung, and Ko Yao districts), and Phuket (all districts). The department has alerted 42 provinces and regional disaster prevention centers to prepare emergency response teams, monitor rainfall and water levels, and issue closures for risky natural attractions including waterfalls and caves. Officials are directed to drain flood-prone areas and prepare temporary shelters. Maritime traffic is strictly banned in affected areas.

On 16 August 2025, King Maha Chakri Maharaj and Queen Suthida presided over the official opening of the Tasomabophit Building and viewed the Navy Medical Care exhibition held beneath the Tasomabophit Building at Somdet Phra Piniklao Hospital, Royal Thai Navy Medical Department, in Thon Buri, Bangkok. The King and Queen lit incense and flowers in homage to the Triple Gem, observed precepts, and pressed an electronic button to unveil the nameplate of the Tasomabophit Building—a royal name given to honor His Majesty King Maha Chakri Maharaj, the Chakri Dynasty Founder and King of the Tenth Reign. The building was constructed to provide expanded medical services for military personnel and the public amid rising demand for healthcare. The hospital undertook this major infrastructure development project to increase patient capacity and elevate treatment standards. The 14-story inpatient building spans over 20,300 square meters and provides comprehensive medical services with a total of 228 patient beds, including 184 general-care beds and 44 critical and semi-critical care beds. The facility is systematically designed to specialize in the care of internal medicine patients and complex medical conditions, supported by an intelligent medical support system to ensure all patients receive the highest standard of safe and efficient care.

The King and Queen then participated in a private ceremony presenting requisites to Buddhist monks, distributed gifts of remembrance to benefactors, and received commemorative offerings. Their Majesties paid respects before the altar and took their leave.

Afterward, Their Majesties proceeded to the Tasomabophit Building to view the Navy Medical Care exhibition beneath the Tasomabophit Building, which was organized to publicize the royal grace and present major achievements through six exhibition zones. Zone 1, The Stream of Royal Compassion, illustrates the boundless royal benevolence the King has extended to all subjects. The King granted 80 million baht to Somdet Phra Piniklao Hospital and Somdet Phra Nang Chao Sirikit Hospital, Royal Thai Navy Medical Department, to support the procurement of modern medical equipment and instruments, as well as ongoing assistance in responding to the COVID-19 pandemic crisis. Zone 2, Tasomabophit: A Royal Name, recounts the background of the 14-story Tasomabophit inpatient building, a royally bestowed name reflecting the King's concern to elevate medical services, reduce overcrowding, and increase access to internationally standard healthcare. Zone 3, Strategic Medicine, showcases emergency rescue operations, field medical procedures, medical evacuation, and naval medical innovations. Zone 4, the Somdet Phra Piniklao Hospital Eye Center, presents excellence in laser eye-correction surgery technology.

At 5 p.m. on August 16, the Thai Meteorological Department issued alert number 3 (157/2569) concerning heavy to very heavy rainfall in upper Thailand affecting August 18-21. Heavy rainfall will occur in several areas, especially in the northern and northeastern regions, due to a monsoon trough passing through these areas combined with a strengthening southwest monsoon affecting the Andaman Sea, Thailand, and the Gulf of Thailand. The public is warned to be cautious of dangers from heavy rainfall and accumulated water, which may cause flash floods and flash floods, particularly on sloped areas near watercourses and in low-lying areas. Travel through flood-prone routes should be avoided, especially in low-lying areas where water may accumulate rapidly. For the upper Andaman Sea, waves will be moderately strong from August 19-21, with heights of 2-3 meters, and over 3 meters in thunderstorm areas. The lower Andaman Sea and upper Gulf of Thailand will have waves of approximately 2 meters, exceeding 2 meters in thunderstorm areas. Fishermen in the Andaman Sea and Gulf of Thailand are advised to navigate with caution and avoid areas with thunderstorms. Small boats in the upper Andaman Sea should remain ashore during this period. The public is urged to plan activities and travel carefully and monitor updates from the Thai Meteorological Department at http://www.tmd.go.th, by phone at 0-2399-4012-13, or 1182 available 24 hours a day. The next alert will be issued on August 17 at 5 a.m.

Natural Resources and Environment Minister Suchat Chomklin on August 16 ordered relevant agencies to coordinate and accelerate wildfire control at the Kruen Marsh area in Nakhon Si Thammarat province. Helicopter support has been arranged for aerial reconnaissance and firefighting operations, with personnel and public safety as the top priority. According to a report from Forestry Department Director Nikorn Silarojanant, the Nakhon Si Thammarat Forest Fire Control Center has been instructed to closely monitor the situation and maintain continuous operations including surveying, firebreak establishment, and water spraying to control the fire and prevent it from spreading. The Special Fire Hawk Operations Team from Nakhon Si Thammarat, along with personnel from the Yong Waterfall-Khao Luang Fire Control Station, Krabi Fire Control Station, and other relevant agencies, are conducting suppression efforts in the Ban Semet Ngam area in Krang Subdistrict, Cha-uat District, within the Little Andaman Wildlife Sanctuary. Personnel are currently using water spraying and firebreak methods to contain the fire while closely monitoring weather conditions and wind direction for effective operations. All agencies are coordinating closely and preparing personnel, equipment, and resources to accelerate control and prevent the fire from spreading to surrounding areas. The minister stated that the ministry will closely track the situation and mobilize resources from all agencies, including ground and aerial personnel, to effectively support wildfire suppression operations while safeguarding public and personnel safety and protecting the natural resources and ecosystems of the Kruen Marsh area.

Deputy Prime Minister Yasothorn Wongswat led a major Pheu Thai campaign rally on August 16, 2025, at Noen Yang Prachasamakkhi School in Kham Muang District to support Khaimook Lordtragul, a former Kalasin Provincial Administration Organization chairman seeking re-election. The rally attracted over 5,000 supporters and featured speeches from multiple Pheu Thai MPs representing Kalasin, who outlined the party's continued development agenda if Khaimook returns to office.

Pheu Thai core members, including party MPs from all four Kalasin electoral zones, took the stage to campaign for Khaimook, emphasizing road improvements, water management, drought and flood prevention, and infrastructure development. Deputy Prime Minister Yasothorn Wongswat highlighted how supporting Khaimook would strengthen the link between provincial administration and parliamentary work, boosting Pheu Thai's chances in upcoming legislative elections.

Khaimook pledged to continue development work across all villages and expressed confidence in her track record of community engagement and cultural preservation. She stated that if elected, she would maintain close contact with residents and push for Pheu Thai to win all six Kalasin parliamentary seats in the next election.

The campaign continued at a second rally venue in Kutchinarain District later that afternoon. Rival candidate Kamnanhit (Prasert Bunyuang), representing the competing slate, was also conducting grassroots campaigning as the race entered its final phase.

On 16 August 2025, Prime Minister and Interior Minister Anutin Charnvirakul, in his capacity as leader of the Bhumjaithai Party, spent a holiday break visiting Buriram province. He met with street vendors and residents, and shared a meal with Nevin Chidchob, chair of Buriram United Football Club, and Traisuli Trisornkul, the Prime Minister's Secretary-General.

The atmosphere was casual and friendly, with vendors and locals asking to take photographs with the PM and Nevin.

Anutin asked the vendors and residents how business was going and whether living standards had improved. The vendors responded positively about the Thai Help Thai Plus 60-40 programme, saying it helps with expenses and has increased sales at local shops, keeping money circulating in the community. Anutin smiled at their feedback and reiterated that any measure truly helping ordinary people is worth continuing, and that the government will pursue additional economic stimulus measures.