TMD Forecasts Heavy Rain Then Cold Spell, South on Flood Alert
The Thai Meteorological Department warns of heavy rain across southern Thailand from November 18–19, raising the risk of flash floods and landslides. A new cold front from China will then bring cooler temperatures nationwide. Residents in vulnerable areas and mariners are urged to stay alert.
The Thai Meteorological Department released a seven-day regional forecast for November 13–19, 2026. In the upper country, temperatures will rise with morning fog from the 13th to the 16th, bringing isolated thundershowers as the high-pressure system weakens. Easterly and southeasterly winds will bring moisture to the lower Northeast, East, Central region, and Greater Bangkok. From the 17th to the 19th, thundershowers will increase with strong gusts before temperatures drop as a new cold front from China spreads over the upper region.
In the South, rain will ease from the 14th to the 17th but heavy downpours will persist in places due to the weakening northeast monsoon over the Gulf and Andaman Sea. Waves in the Andaman Sea and Gulf will reach about one metre, exceeding two metres in thundershower areas. From the 18th to the 19th, rainfall will intensify with heavy to very heavy rain as the monsoon strengthens. Lower Gulf waves will reach two metres, again higher in stormy areas.
Authorities urge southern residents to watch for flash floods, landslides, and mudslides, especially in foothills, near waterways, and low-lying areas due to accumulated heavy rain. Mariners in the Gulf and Andaman should check routes, proceed with caution, and avoid sailing in thundershower zones throughout the period.
Detailed regional breakdowns follow:
North: Cool with morning fog from the 14th–16th, temperatures rising 1–3°C with isolated rain. Low 18–25°C, high 27–35°C; hilltops 10–15°C. Thundershowers covering 30–40% of the area on the 17th–18th. Lows 21–26°C, highs 30–36°C; hilltops 12–17°C. Then cool mornings return with a slight temperature dip and isolated rain.
Northeast: Cool with patchy morning fog from the 13th–16th, temperatures up 1–3°C with isolated rain. Low 20–24°C, high 30–34°C; hilltops 11–17°C. Thundershowers over 20–40% of the area with strong gusts on the 17th–18th.
[Additional regional details omitted for brevity]
