The southwest monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand is becoming stronger, the department said, adding that the active low-pressure cell covering the middle China Sea is expected to intensify in the next few days.
The weather forecast for the next 24 hours:
North: Hot day with thundershowers in 30 per cent of the areas; temperature lows of 23-27 degrees Celsius, highs of 36-39°C.
Northeast: Hot day with thundershowers in 40 per cent of the areas; temperature lows of 25-28°C, highs of 34-39°C.
Central: Hot day with thundershowers in 20 per cent of the areas; temperature lows of 25-28°C, highs of 37-39°C.
East: Thundershowers in 30 per cent of the areas; temperature lows of 25-29°C, highs of 34-38°C; waves a metre high and 1-2 metres during thundershowers.
South (east coast): Thundershowers in 40 per cent of the areas; temperature lows of 24-26°C, highs of 34-37°C; waves a metre high and 1-2 metres during thundershowers.
South (west coast): Thundershowers in 40 per cent of the areas with isolated heavy rains; temperature lows of 21-27°C, highs of 30-32°C; waves a metre high and 1-2 metres during thundershowers.
Bangkok and surrounding areas: Thundershowers in 10 per cent of the areas; temperature lows of 28-29°C, highs of 35-39°C.