TMD forecasts rain across 80% of greater Bangkok on Oct 10

The Thai Meteorological Department (TMD) warned on October 10, 2026, of increased rain and unsettled weather in upper Thailand, with thundershowers forecast across 80% of Bangkok and surrounding areas. The capital and neighbouring provinces also face gusty winds and isolated heavy rain. Kanchanaburi in the Central region and Rayong, Chanthaburi and Trat in the East face isolated very heavy rain, according to the TMD’s daily forecast.

TMD warns of flash floods and runoff in vulnerable areas

Heavy to very heavy rain and accumulated rainfall could trigger flash floods and runoff from higher ground, particularly near waterways at the foot of hills and in low-lying areas, the TMD warned. Waterlogging is also possible in low-lying locations.
Upper Thailand is expected to experience thundershowers, gusty winds, hail and isolated heavy to very heavy rain, with lightning also possible, according to the TMD. Parts of the South remain at risk of heavy rain.

The TMD attributed the unsettled conditions to another high-pressure system, or cold air mass, from China that had reached northern Vietnam. The system was expected to extend over the upper North, upper Northeast and South China Sea on October 10.

Easterly and southeasterly winds are carrying moisture from the South China Sea into the eastern part of the Northeast and the East, while a monsoon trough lies across the Gulf of Thailand and the South, the TMD said.

Regional forecasts put thundershower coverage at 60–80%

The TMD’s forecast for 6am on October 10 to 6am on October 11, Thailand time, puts regional thundershower coverage at between 60% and 80%.

North: The TMD’s October 10 forecast puts thundershower coverage at 60%, with gusty winds and isolated hail. Heavy rain is forecast in parts of Chiang Mai, Chiang Rai, Lamphun, Lampang, Phayao, Nan, Phrae, Sukhothai, Tak, Kamphaeng Phet and Phetchabun. Minimum temperatures are forecast at 20–24°C and maximums at 34–36°C, with easterly winds of 10–20km/h.

Northeast: The TMD forecasts thundershowers across 60% of the region on October 10, with gusty winds and isolated heavy rain in Loei, Bueng Kan, Sakon Nakhon, Nakhon Phanom, Khon Kaen, Chaiyaphum, Nakhon Ratchasima, Buri Ram, Surin, Si Sa Ket and Ubon Ratchathani. Minimum temperatures are forecast at 22–24°C and maximums at 32–34°C, with easterly winds of 10–25km/h.

Central region: Thundershowers are forecast across 70% of the region on October 10, with gusty winds and isolated hail, according to the TMD. Heavy rain is expected in parts of Lop Buri, Saraburi, Nakhon Sawan, Chai Nat, Sing Buri, Ang Thong, Phra Nakhon Si Ayutthaya, Uthai Thani, Suphan Buri, Nakhon Pathom, Ratchaburi, Samut Sakhon and Samut Songkhram, with isolated very heavy rain in Kanchanaburi. Minimum temperatures are forecast at 24–26°C and maximums at 34–36°C, with easterly winds of 10–20km/h.

East: The TMD forecasts thundershowers across 70% of the region on October 10, with isolated gusty winds, heavy rain in parts of Nakhon Nayok, Prachin Buri, Sa Kaeo, Chachoengsao and Chon Buri, and isolated very heavy rain in Rayong, Chanthaburi and Trat. Minimum temperatures are forecast at 23–27°C and maximums at 32–35°C, with northeasterly winds of 15–30km/h. Waves are expected to be about 1 metre high, exceeding 2 metres in thundershowers.

South, east coast: The TMD’s October 10 forecast puts thundershower coverage at 60%, with isolated heavy rain in Phetchaburi, Prachuap Khiri Khan, Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla and Narathiwat. Minimum temperatures are forecast at 23–24°C and maximums at 32–34°C, with variable winds of 15–30km/h. Waves are expected to be about 1 metre high, exceeding 2 metres in thundershowers.

South, west coast: Thundershowers are forecast across 60% of the region on October 10, with isolated heavy rain in Ranong, Phang Nga, Phuket, Krabi, Trang and Satun, according to the TMD. Minimum temperatures are forecast at 23–25°C and maximums at 32–34°C, with northwesterly winds of 15–30km/h. Waves are expected to be about 1 metre high, exceeding 2 metres in thundershowers.

Bangkok and surrounding areas: The TMD forecasts thundershowers across 80% of the area on October 10, with gusty winds and isolated heavy rain. Minimum temperatures are forecast at 25–27°C and maximums at 33–35°C, with northeasterly winds of 10–20km/h.

Andaman Sea and Gulf waves may exceed 2 metres in storms

Waves in the Andaman Sea and Gulf of Thailand could exceed 2 metres in areas experiencing thundershowers, the TMD warned. Mariners should navigate cautiously and avoid sailing through thundershowers.