Heavy rain forecast for southern Thailand as upper regions face storms
Flash floods and fast-flowing run-off could affect the South, while gusts and lightning are forecast in upper Thailand. Waves will exceed two metres in thundershowers.
- Southern Thailand is forecast to receive continuous heavy to very heavy rainfall over the next 24 hours, with authorities warning of potential flash floods.
- Upper Thailand, including the North and Northeast, will experience unsettled weather with thundershowers, gusty winds, and heavy rain.
- The severe weather is caused by a high-pressure system from China, moisture from the South China Sea, and a strengthening monsoon trough over the South.
- Mariners are advised to proceed with caution as waves in the Andaman Sea and Gulf of Thailand are expected to exceed two meters in areas with thundershowers.
Continuous rain will persist in southern Thailand over the next 24 hours, with heavy to very heavy downpours in some areas, the Thai Meteorological Department forecast on Sunday (October 25, 2026).
Upper Thailand will experience unsettled weather, with thundershowers, gusty winds and heavy rain, as well as possible lightning in some areas.
The Northeast and North will be affected first, followed by the Central region, including Bangkok and surrounding provinces, and the East.
People in the South should beware of thundershowers, heavy to very heavy rain and accumulated rainfall that could cause flash floods and fast-flowing run-off, particularly on foothill slopes near waterways and in low-lying areas.
People in upper Thailand should take precautions against thundershowers and gusty winds.
They should avoid staying in open spaces, under large trees or beneath unsecured billboards.
These conditions will result from a high-pressure system, or cold air mass, extending from China over upper Thailand and the South China Sea.
Easterly winds will carry moisture from the South China Sea and the Gulf of Thailand into upper Thailand and the upper South, while the monsoon trough over the South strengthens.
Waves in the Andaman Sea and the Gulf of Thailand will exceed two metres in areas with thundershowers.
Mariners should proceed with caution and avoid sailing through these areas.
Regional forecast from 6am on Sunday (October 25) to 6am on Monday (October 26)
North: Thundershowers are forecast over 30% of the region, in Phayao, Nan, Phrae, Uttaradit, Phitsanulok and Phetchabun, with gusty winds in some areas. Minimum temperatures will range from 21–26°C and maximum temperatures from 35–37°C. Southeasterly winds will blow at 10–20 km/h.
Northeast: Thundershowers are forecast over 30% of the region, in Loei, Nong Khai, Bueng Kan, Udon Thani, Sakon Nakhon and Nakhon Phanom, with gusty winds and heavy rain in some areas. Minimum temperatures will range from 23–25°C and maximum temperatures from 34–37°C. Easterly winds will blow at 10–20 km/h.
Central region: Thundershowers will cover 20% of the region, mainly in Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Sakhon and Samut Songkhram. Minimum temperatures will range from 24–27°C and maximum temperatures from 35–36°C. Southeasterly winds will blow at 10–20 km/h.
East: Thundershowers will cover 20% of the region, mainly in Nakhon Nayok, Chachoengsao, Chonburi and Rayong. Minimum temperatures will range from 23–25°C and maximum temperatures from 32–35°C. Southeasterly winds will blow at 10–30 km/h. Waves will be below one metre, with heights exceeding two metres in areas with thundershowers.
South, east coast: Thundershowers will cover 60% of the region, with heavy rain in some areas of Surat Thani, Nakhon Si Thammarat and Phatthalung.
Very heavy rain is forecast in some areas of Songkhla, Pattani, Yala and Narathiwat. Minimum temperatures will range from 23–25°C and maximum temperatures from 32–35°C. Winds will be variable at 15–30 km/h. Waves will be about one metre high, with heights exceeding two metres in areas with thundershowers.
South, west coast: Thundershowers will cover 70% of the region, with heavy rain in some areas of Ranong, Phang Nga and Phuket.
Very heavy rain is forecast in some areas of Krabi, Trang and Satun. Minimum temperatures will range from 23–26°C and maximum temperatures from 31–33°C. Northwesterly winds will blow at 15–30 km/h. Waves will be about one metre high, with heights exceeding two metres in areas with thundershowers.
Bangkok and surrounding provinces: Thundershowers will cover 20% of the area. Minimum temperatures will range from 25–27°C and maximum temperatures from 34–35°C. Southeasterly winds will blow at 10–20 km/h.
