TMD flags 1–2°C drop in North and heavy rain in South on Nov 11
Upper Thailand faces cooler mornings and strong winds on November 11, with waves of 2–3 metres forecast in lower Gulf and small boats urged ashore
- The Thai Meteorological Department forecasts a 1–2°C temperature drop in Northern Thailand on November 11, bringing cooler mornings and strong winds due to a high-pressure system from China.
- Isolated heavy rain is expected across five provinces on the southern east coast, prompting warnings for potential flash floods and runoff in low-lying areas.
- The weather system will also strengthen waves in the lower Gulf of Thailand to 2–3 meters, and small boats are advised to remain ashore.
The Thai Meteorological Department (TMD) forecast isolated heavy rain in five southern provinces on November 11, 2026, bringing risks of flash floods and runoff, while upper Thailand faces cooler conditions and strong winds.
The TMD’s 24-hour forecast covers 6am on November 11 to 6am on November 12, Thai time. Residents in southern Thailand were advised to watch for thundershowers, heavy rain and accumulated rainfall, particularly on foothill slopes near waterways and in low-lying areas where flash floods and runoff could occur.
Cold air brings cooler conditions to upper Thailand
Another fairly strong high-pressure system, or cold air mass, from China is spreading across upper Thailand and the South China Sea, according to the TMD.
A westerly trough is also moving across Myanmar and northern Thailand, while a moderate northeast monsoon prevails over the Gulf of Thailand, the South and the Andaman Sea, the TMD reported.
The TMD advised residents across upper Thailand to take care of their health as conditions turn colder and urged farmers to protect crops against strong winds. Thundershowers and isolated gusty winds are also expected in the upper North.
Lower Gulf waves forecast to reach 2–3 metres
Winds and waves are strengthening in the Andaman Sea and Gulf of Thailand, with waves in the lower Gulf expected to reach 2–3 metres and exceed 3 metres in thundershowers, according to the TMD.
The TMD urged mariners to navigate cautiously and avoid areas with thundershowers. Small boats in the lower Gulf should remain ashore during this period.
North set for 1–2°C drop as southern east coast faces heavy rain
The TMD’s regional outlook forecasts a temperature drop of 1–2°C in the North and thundershowers across 60% of the South’s east coast, with isolated heavy rain. The regional forecast for 6am on November 11 to 6am on November 12 is as follows:
- North: Cool mornings and strong winds are forecast, with temperatures falling by 1–2°C. Thundershowers will affect 20% of the region, with isolated gusty winds, mainly in Mae Hong Son, Chiang Mai and Chiang Rai. Minimum temperatures will be 17–23°C and maximum temperatures 24–33°C. Mountain tops will be cold, with lows of 9–15°C. Easterly winds will blow at 10–30 km/h.
- Northeast: Cool mornings and strong winds are expected, with isolated light rain in the lower part of the region. Minimum temperatures will be 16–19°C and maximum temperatures 27–32°C. Mountain tops will be cold, with lows of 10–14°C. Northeasterly winds will blow at 15–30 km/h.
- Central region: Cool mornings, strong winds and isolated light rain are forecast. Minimum temperatures will be 21–23°C and maximum temperatures 31–33°C. Northeasterly winds will blow at 10–30 km/h.
- East: Cool mornings, strong winds and isolated light rain are expected. Minimum temperatures will be 20–23°C and maximum temperatures 31–33°C. Northeasterly winds will blow at 15–30 km/h. Waves will be about 1 metre high, exceeding 1 metre offshore.
- South, east coast: Thundershowers are forecast across 60% of the region, with isolated heavy rain in Chumphon, Surat Thani, Nakhon Si Thammarat, Phatthalung and Songkhla. Minimum temperatures will be 22–24°C and maximum temperatures 28–32°C. From Surat Thani northwards, northeasterly winds will blow at 15–35 km/h, with waves of 1–2 metres and above 2 metres in thundershowers. From Nakhon Si Thammarat southwards, easterly winds will reach 20–40 km/h, with waves of 2–3 metres and above 3 metres in thundershowers.
- South, west coast: Thundershowers are expected across 40% of the region, mainly in Ranong, Phang Nga, Trang and Satun. Minimum temperatures will be 23–24°C and maximum temperatures 30–33°C. Easterly winds will blow at 15–35 km/h. Waves will be about 1 metre high, rising to 1–2 metres offshore and above 2 metres in thundershowers.
- Bangkok and surrounding provinces: Cool mornings, strong winds and isolated light rain are forecast. Minimum temperatures will be 22–23°C and maximum temperatures 31–33°C. Northeasterly winds will blow at 10–30 km/h.
