Moderate high-pressure system brings cooler weather across Thailand with Bangkok at 22°C and northern lows of 18°C.
PETALING JAYA: Thailand is experiencing a noticeable temperature drop as a moderate high-pressure system from China extends over the upper part of the country, bringing cooler weather to multiple regions and prompting health advisories from the Meteorological Department.
Current Weather Conditions (November 16-17, 2025)
On Sunday morning, Thailand’s English daily The Nation reported that temperatures in the northern region dropped to as low as 18°C, while Bangkok and surrounding areas experienced cool morning conditions with temperatures ranging between 22-23°C.
The northeastern region is facing the most dramatic weather changes, with cool to cold conditions accompanied by strong winds and isolated thunderstorms affecting approximately 10% of the area, particularly in Ubon Ratchathani, Sisaket, Surin, and Buri Ram provinces.
Mountain peak temperatures have plummeted further, with the northern highlands recording lows between 6-14°C, while northeastern mountain areas see temperatures between 11-15°C.
Regional Breakdown
Bangkok and Vicinity:
- Cool morning weather
- Minimum: 22-23°C
- Maximum: 30-33°C
- Northeast winds: 10-20 km/h
Northern Region:
- Cool mornings with isolated thunderstorms (10% coverage)
- Affected provinces: Mae Hong Son, Chiang Mai, Tak, and Kamphaeng Phet
- Minimum: 18-21°C
- Maximum: 31-34°C
- Mountain peaks: 6-14°C (cold to very cold)
- East winds: 10-15 km/h
Northeastern Region:
- Cool weather with strong winds and scattered thunderstorms (10% coverage)
- Affected provinces: Ubon Ratchathani, Sisaket, Surin, and Buri Ram
- Minimum: 16-20°C
- Maximum: 28-31°C
- Mountain peaks: 11-15°C
- Northeast winds: 10-30 km/h
Central Region:
- Cool morning conditions
- Minimum: 20-22°C
- Maximum: 30-32°C
- Northeast winds: 10-20 km/h
Southern Weather Warnings
While the upper regions experience cooler temperatures, the southern part of Thailand faces contrasting conditions with isolated thunderstorms expected throughout the area.
The northeast monsoon is affecting both the Gulf of Thailand and the Andaman Sea, creating moderate wave conditions of 1-2 metres in the upper Gulf and offshore Andaman areas. In thunderstorm zones, waves may exceed 2 metres.
Maritime authorities have issued caution advisories for vessels operating in these waters, urging mariners to avoid navigating through areas with active thunderstorms.
Extended Forecast (November 17-23, 2025)
The Meteorological Department warns of increasingly unstable weather conditions across upper Thailand in the coming week. A strong high-pressure system from China will extend over northern Thailand and the South China Sea, bringing significant weather changes.
Expected Developments:
Upper Thailand:
- Unstable weather with thunderstorms initially in the northeast before spreading
- Further temperature drops bringing cool to cold conditions
- Strong winds across multiple regions
Southern Thailand:
- Increased rainfall with heavy to very heavy downpours in some areas
- Intensifying northeast monsoon combined with easterly wind shifts
- Upper Gulf of Thailand: waves reaching 2-3 metres
- Upper Andaman Sea: waves around 2 metres (exceeding 3 metres in storm areas)
Public Safety Advisories
The Meteorological Department has issued several important warnings:
Health Precautions: Residents in northern, northeastern, and central regions should take care of their health due to cold weather conditions, particularly during morning hours.
Flood Warnings: Eastern and southern coastal residents should be vigilant about heavy rainfall that could trigger flash flooding and water runoff, especially near slopes and waterways.
Maritime Safety:
- Mariners in the Gulf of Thailand and Andaman Sea should exercise extreme caution
- Avoid navigating through thunderstorm areas
- Critical Alert: Small boats in the Gulf of Thailand are strongly advised to remain ashore from November 19-23, 2025
Weather Pattern Context
This cold front represents typical seasonal weather patterns as high-pressure systems from China push southward during Thailand’s cool season.
However, the simultaneous intensification of the northeast monsoon in southern regions creates a stark weather divide across the country.
