Monsoon strengthens over Thailand, bringing heavy rain to the South

According to the Meteorological Department, the central and lower South will see scattered heavy rain, particularly in Prachuap Khiri Khan, Chumphon, Surat Thani, Ranong and Phang Nga. Residents are advised to be cautious of thunderstorms, flash floods and accumulated rainfall, as well as waterlogged roads that may affect travel.

The intensified monsoon trough is moving across the central South, while a moderate northeast monsoon prevails over the upper Gulf of Thailand, the upper southern region and the upper Andaman Sea. Waves in the upper Gulf and offshore areas of the upper Andaman are moderate, around 1–2 metres high, and may exceed 2 metres during thunderstorms. The lower Gulf and Andaman Sea will see waves about 1 metre high, rising beyond 2 metres in stormy areas. Mariners in both seas are urged to navigate with caution and avoid sailing in thunderstorm zones.

In the upper part of the country, temperatures will rise slightly, but the North and Northeast will still experience cool mornings, with isolated light rain possible due to a weakening high-pressure system covering the area. Residents in these regions are advised to take care of their health as temperatures fluctuate during this period.

Weather forecast for Thailand

From 6am Monday (October 27) to 6am Tuesday (October 28)

Bangkok and vicinity

• Mostly cloudy with slightly higher temperatures and isolated light showers.
• Low: 24–26°C
• High: 32–34°C
• Wind: Northeasterly, 10–20 km/h

Northern region

Cool morning with a slight rise in temperature and isolated light rain.

• Low: 19–23°C
• High: 31–34°C
• Mountain tops: Cold, 9–15°C
• Wind: Northeasterly, 10–15 km/h

Northeastern region

Cool morning with slightly warmer daytime temperatures and about 10% chance of rain, mainly in Yasothon, Amnat Charoen, Si Sa Ket and Ubon Ratchathani.

• Low: 20–23°C
• High: 30–33°C
• Hilltops: Cool to cold, 13–16°C
• Wind: Northeasterly, 10–25 km/h

Central region

Mostly cloudy with a slight rise in temperature and isolated light showers.

• Low: 23–25°C
• High: 32–34°C
• Wind: Northeasterly, 10–20 km/h

Eastern region

Mostly cloudy with a slight temperature increase and about 10% chance of rain, especially in Sa Kaeo, Rayong, Chanthaburi and Trat.

• Low: 23–26°C
• High: 32–33°C
• Wind: Northeasterly, 15–35 km/h
• Sea: Waves around 1 metre high, offshore 1–2 metres, and over 2 metres in thundershowers.

Southern region (east coast)

Thunderstorms in 60% of the area with heavy rain in parts of Prachuap Khiri Khan, Chumphon, Surat Thani and Nakhon Si Thammarat.

• Low: 24–25°C
• High: 29–33°C
• From Chumphon northward: Northeasterly wind 15–35 km/h; waves 1–2 metres, over 2 metres in storms.
• From Surat Thani southward: Variable wind 15–30 km/h; waves around 1 metre, over 2 metres in storms.

Southern region (west coast)

Thunderstorms across 60% of the area with heavy rain in Ranong, Phangnga and Phuket.

• Low: 24–25°C
• High: 29–34°C
• From Phangnga northward: Easterly wind 15–30 km/h; waves around 1 metre, 1–2 metres offshore, over 2 metres in thundershowers.
• From Phuket southward: Variable wind 15–30 km/h; waves around 1 metre, over 2 metres in stormy areas.

Mariners in both the Gulf of Thailand and the Andaman Sea are advised to proceed with caution and avoid sailing in areas with thunderstorms.