Southern Thailand Weather Forecast: Dec 4-8 – Heavy Rain Ahead

Thailand Weather Forecast: December 2-8, 2025 – Heavy Rain Expected in the South, Cooler Temperatures Northward

A comprehensive weather outlook for thailand from December 2nd to 8th, 2025, indicates a shift in conditions across the country, with increased rainfall anticipated in the southern region and cooler temperatures prevailing in the north and northeast. The Meteorological Department has issued guidance for residents to prepare for changing conditions, including potential hazards from heavy rain, fog, and fluctuating temperatures.

southern Region Braces for Increased Rainfall

The southern region is expected to experience a significant increase in rainfall between December 4th and 8th, with forecasts predicting heavy rain in some places. This shift is attributed to eastward-moving wind waves covering the Gulf of Thailand, the southern region, and the Andaman Sea. Currently, the lower southern region is experiencing relatively dry conditions due to a weakening northeast monsoon. Though, this is expected to change rapidly.

During the period of December 4th-8th, wave heights in the Gulf of Thailand and the Andaman Sea are predicted to increase to 1-2 meters, potentially exceeding 2 meters in areas experiencing thunderstorms. Boaters are strongly advised to exercise caution and avoid navigating in areas prone to thunderstorms.

Northern and Northeastern Thailand to See Cooler Temperatures

While the south prepares for increased precipitation, upper thailand will experience a period of rising temperatures initially, followed by cooler conditions. Temperatures are expected to rise 2-4 degrees Celsius in the north throughout the forecast period. Though, the northern region will remain cool to cold, with temperatures ranging from a low of 12-22°C to a high of 27-33°C. At higher elevations, temperatures will drop significantly, reaching lows of 4-15°C.

A new high-pressure area or moderate cold air mass originating from China is expected to spread across the northeastern region, contributing to cooler temperatures and the potential for fog. The northeast will see temperatures between 15-23°C,with mountain peaks experiencing lows of 8-16°C.

Central and Eastern Regions: Cool mornings and Potential for Showers

The central region, including Bangkok and surrounding areas, and the eastern region will experience cool weather with some fog in the mornings.Temperatures are expected to rise 1-3 degrees Celsius throughout the period.From December 5th to 8th, there is a 10-30% chance of rain or thunderstorms in the central region and a 20-40% chance in the eastern region.

Bangkok and Surrounding Areas: Mild Temperatures and Fog

bangkok and its surrounding areas will experience similar conditions to the central region,with cool mornings and a slight increase in temperature. The forecast predicts a 10-30% chance of rain or thunderstorms between December 5th and 8th. Temperatures will range from a low of 20-25°C to a high of 30-34°C.

Regional Wind Patterns and Sea Conditions

Wind patterns will shift throughout the period. From December 2nd to 4th, northwesterly winds of 10-15 km/hr are expected in the north, while northeasterly winds of 10-15 km/hr will prevail in the northeast. From December 4th to 8th,easterly winds will become more dominant,increasing to 10-25 km/hr in the northeast and 10-25 km/hr in the central region. The eastern region will experience northeasterly winds of 15-30 km/hr from December 2nd-3rd, shifting to southeasterly winds of 15-30 km/hr from December 4th-8th.

Safety Precautions and Public Advisories

The Meteorological Department has issued several safety advisories.Residents in upper Thailand and the upper southern region are urged to prioritize their health due to the fluctuating weather conditions. Travelers in upper Thailand should be cautious of fog and potential fire hazards associated with dry weather. Farmers in upper Thailand are advised to prepare for potential damage to agricultural products. all boaters in the gulf of Thailand and Andaman Sea are urged to navigate with caution and avoid areas with thunderstorms.