Prachuap and Chumphon face flash flood risk on October 28
Bangkok faces thundershowers and gusts, while waves in the Gulf of Thailand and Andaman Sea could exceed 2 metres during storms.
- The Thai Meteorological Department has warned residents of Prachuap Khiri Khan and Chumphon about the risk of flash floods and rapid runoff on the evening and night of October 28.
- The warning is due to continued heavy to very heavy rainfall, which threatens to trigger floods, landslides, and overflowing waterways.
- Vulnerable areas, particularly foothills and low-lying regions near watercourses, are at the highest risk.
- Residents in these areas are urged to remain alert, while travelers are advised to be cautious.
Residents in Prachuap Khiri Khan and Chumphon have been warned of flash floods and rapid runoff during the evening and night of October 28, 2026, as further heavy rain threatens vulnerable foothill and low-lying areas.
The Thai Meteorological Department (TMD) issued Advisory No. 11 (283/2026) at 5pm, warning of continuing rain with isolated heavy to very heavy downpours in the South.
The department said the notice, which covers conditions through October 28, was its final advisory for this weather episode. Its separate forecast for 6pm on October 28 to 6pm on October 29 still predicts isolated very heavy rain in Prachuap Khiri Khan, Chumphon and Surat Thani.
Accumulated rain threatens foothills and low-lying areas
The department warned that accumulated rainfall could trigger flash floods, rapid runoff and overflowing waterways, particularly near watercourses at the foot of hills. Landslides are also a risk, while low-lying areas could experience waterlogging.
Residents in vulnerable areas were urged to remain alert, while people travelling during the evening should allow extra time and proceed cautiously.
Thundershowers are forecast across 70% of both southern coastal regions during the 24-hour forecast period. Very heavy rain is expected in isolated areas of Prachuap Khiri Khan, Chumphon and Surat Thani, rather than across the entire region.
Bangkok and eastern Thailand face thundershowers and gusts
Thundershowers, gusty winds and isolated heavy rain remain possible in upper Thailand, particularly the Central region, including Bangkok and surrounding provinces, and the East.
Residents were advised to avoid open areas, large trees and unsecured billboards during storms.
The department attributed the conditions to a low-pressure area over the Andaman Sea and easterly winds across Thailand and the Gulf of Thailand. A high-pressure system, or cool air mass, from China also covers upper Thailand and the South China Sea.
For Bangkok and surrounding areas, the regional forecast specifies thundershowers covering 60% of the area, with gusts in some locations.
Boat operators warned to avoid thundershowers
Waves in the Gulf of Thailand and Andaman Sea could exceed 2 metres in thundershower areas.
Boat operators were advised to check their routes, navigate cautiously and avoid sailing through thundershowers. The warning applies to storm-affected waters, rather than indicating waves above 2 metres throughout both seas.
Regional forecast through 6pm on October 29
The following forecast covers 6pm on October 28 to 6pm on October 29, 2026. Percentages refer to the area of each region expected to experience thunderstorms, not the probability of rain at an individual location.
North
Thundershowers are forecast across 20% of the region, mainly in Tak, Kamphaeng Phet, Phichit and Phetchabun. Minimum temperatures will range from 21–25°C and maximum temperatures from 31–35°C, with easterly winds of 10–20km/h.
Northeast
Thundershowers are forecast across 10% of the region, mainly in Loei, Chaiyaphum, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani. Minimum temperatures will range from 21–24°C and maximum temperatures from 33–35°C, with northeasterly winds of 10–25km/h.
Central region
Thundershowers are forecast across 60% of the region, accompanied by gusts and isolated heavy rain in Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram. Minimum temperatures will range from 22–25°C and maximum temperatures from 32–35°C, with easterly winds of 10–20km/h.
East
Thundershowers are forecast across 40% of the region, with gusts and isolated heavy rain in Chon Buri, Rayong, Chanthaburi and Trat. Minimum temperatures will range from 23–26°C and maximum temperatures from 32–35°C, with northeasterly winds of 10–30km/h.
Waves will generally remain below 1 metre but could exceed 2 metres in thunderstorms.
South, east coast
Thundershowers are forecast across 70% of the region, with isolated heavy rain in Phetchaburi, Nakhon Si Thammarat, Phatthalung and Songkhla. Isolated very heavy rain is forecast in Prachuap Khiri Khan, Chumphon and Surat Thani.
Minimum temperatures will range from 21–25°C and maximum temperatures from 30–31°C.
From Chumphon northwards, easterly winds will reach 15–30km/h. From Surat Thani southwards, southeasterly winds will reach 15–30km/h, with waves around 1 metre and above 2 metres in thunderstorms.
South, west coast
Thundershowers are forecast across 70% of the region, with isolated heavy rain in Ranong, Phang Nga, Phuket, Krabi and Trang. Minimum temperatures will range from 23–25°C and maximum temperatures from 31–33°C.
From Phang Nga northwards, easterly winds will reach 15–35km/h. Waves will be around 1 metre, rising to 1–2 metres offshore and above 2 metres in thundershowers.
From Phuket southwards, southwesterly winds will reach 15–35km/h, with waves of 1–2 metres and above 2 metres in thundershowers.
Bangkok and surrounding areas
Thundershowers are forecast across 60% of the area, with gusts in some locations. Minimum temperatures will range from 25–27°C and maximum temperatures from 33–35°C, with easterly winds of 10–20km/h.
The department urged the public to plan daily activities and journeys carefully and continue monitoring official updates at www.tmd.go.th. Weather information is also available around the clock on 02-399-4012, 02-399-4013 and 1182.
