The moderate northeast monsoon across the Gulf and the South, meanwhile, will bring heavy rain to the South with wind whipping up the waves up to about 2 metres high in the lower Gulf and above 2 metres during storms. Ships should proceed with caution.
The weather forecast for the next 24 hours is as follows:
Northern region: Cool weather and mist in the morning; temperature lows of 19-22 degrees and highs of 31-33 degrees Celsius. Temperature likely to drop to 8-12 degrees on hilltops.
Northeastern region: Cool weather in the morning; lows 18-22 degrees, highs 28-33 degrees Celsius. Temperature likely to drop to 9-12 degrees on hilltops.
Central region: Cool weather and mist in the morning; lows 20-23 degrees, highs 30-33 degrees Celsius.
Eastern region: Cool weather and mist in the morning; lows 21-25 degrees, highs 32-35 degree Celsius; wave height 1 metre.
Southern region (east coast): Partly cloudy with thunder showers in 60 per cent of the area; lows of 22-26 degrees, high 30-33 degrees Celsius; wave height 1-2 metres, increasing to 2 metres during storms.
Southern region (west coast): Partly cloudy with thunder showers in 30 per cent of the area; lows 23-25 degrees, highs 32-34 degree Celsius; wave height 1 metre, increasing to 1-2 metres during storms.
Bangkok and surrounding area: Warmer weather with mist in the morning, lows of 24-25 degrees, highs 32-34 degrees Celsius.