Hail risk in upper Thailand as South faces very heavy rain
Upper Thailand faces thundershowers and hail on November 5–7, followed by heavy to very heavy rain and flash flood risks in the South on November 7–9.
- Upper Thailand is forecast to experience thundershowers, gusty winds, and hail from November 5-7.
- Southern Thailand is expected to face heavy to very heavy rain from November 7-9, creating a risk of flash floods and forest runoff.
- The adverse weather is caused by a high-pressure cold air mass from China, which will affect the Northeast first before spreading.
- Mariners are warned of waves exceeding two meters in the Gulf of Thailand and Andaman Sea in areas with thundershowers.
Thundershowers, gusty winds, hail and isolated heavy rain are forecast for upper Thailand from November 5–7, 2026, while the South faces heavy to very heavy rain and flash flood risks from November 7–9.
The Thai Meteorological Department (TMD) outlined the conditions in its third weather advisory, issued at 5pm on November 2.
Northeast to be affected first
The unsettled weather will affect the Northeast first before reaching the North, Central region including Bangkok and surrounding provinces, and East.
Residents are advised to avoid open areas, sheltering under large trees and standing near unsecured billboards during thundershowers and gusty winds.
A fresh high-pressure system, or cold air mass, from China is expected to spread over upper Thailand and the South China Sea, strengthening the easterly winds prevailing over Thailand and the Gulf of Thailand.
Southern rainfall raises flash flood risks
Rainfall is expected to increase across the South, with heavy rain in many areas and isolated very heavy rain.
Accumulated rainfall could trigger flash floods and forest runoff, particularly in foothill areas near waterways and in low-lying locations.
Waves to exceed two metres in thundershowers
Waves in the Gulf of Thailand and Andaman Sea are expected to exceed two metres in areas with thundershowers. Mariners should navigate cautiously and avoid sailing through affected areas.
The public is advised to plan daily activities and travel carefully and continue following TMD advisories. Updates are available through the department’s website or by calling 0-2399-4012-13 or 1182, 24 hours a day.
The next advisory is scheduled for 5am on November 3.
Regional forecast for November 2–3
The following regional forecast covers the 24 hours from 6pm on November 2 to 6pm on November 3 and is separate from the November 5–9 advisory.
Bangkok and surrounding provinces: Thundershowers are forecast across 60% of the area, with isolated gusty winds. Minimum temperatures will be 24–25°C and maximum temperatures 33–35°C, with southeasterly winds at 10–20 km/h.
North: Thundershowers will cover 40% of the region, with isolated gusty winds, mainly in Mae Hong Son, Chiang Mai, Chiang Rai, Phayao, Nan, Uttaradit, Tak, Phitsanulok and Phetchabun. Minimum temperatures will be 22–25°C and maximum temperatures 35–37°C, with easterly winds at 10–20 km/h.
Northeast: Thundershowers are forecast across 30% of the region, with isolated gusty winds, mainly in Loei, Nong Khai, Nong Bua Lamphu, Khon Kaen, Bueng Kan, Udon Thani, Sakon Nakhon, Nakhon Phanom, Chaiyaphum, Nakhon Ratchasima, Buri Ram and Surin. Minimum temperatures will be 23–25°C and maximum temperatures 35–36°C, with northeasterly winds at 10–20 km/h.
Central region: Thundershowers will cover 40% of the region, with isolated gusty winds, mainly in Kanchanaburi, Suphan Buri, Lop Buri, Saraburi, Ratchaburi, Phra Nakhon Si Ayutthaya, Nakhon Pathom, Samut Songkhram and Samut Sakhon. Minimum temperatures will be 24–26°C and maximum temperatures 34–36°C, with easterly winds at 10–20 km/h.
East: Thundershowers are forecast across 40% of the region, with isolated gusty winds, mainly in Nakhon Nayok, Prachin Buri, Sa Kaeo, Chon Buri, Rayong, Chanthaburi and Trat. Minimum temperatures will be 23–25°C and maximum temperatures 33–35°C, with southeasterly winds at 10–30 km/h. Waves will be below one metre, rising to more than two metres in areas with thundershowers.
South (east coast): Thundershowers will cover 40% of the region, with isolated heavy rain in Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala and Narathiwat. Minimum temperatures will be 22–24°C and maximum temperatures 32–34°C. From Surat Thani northwards, easterly winds will reach 15–30 km/h. From Nakhon Si Thammarat southwards, southeasterly winds will reach 15–30 km/h. Waves in both areas will be about one metre high, rising above two metres in thundershowers.
South (west coast): Thundershowers are forecast across 40% of the region, mainly in Phang Nga, Phuket, Trang and Satun. Minimum temperatures will be 23–24°C and maximum temperatures 32–34°C, with easterly winds at 15–30 km/h. Waves will be about one metre high, exceeding one metre offshore and two metres in areas with thundershowers.
