The department warned people to beware of severe conditions and flash floods.
Here’s the weather forecast for the next 24 hours:
North: Thundershowers in 70 per cent of the area with isolated heavy rains; temperature lows of 23-25 degrees and highs of 32-34 degrees Celsius.
Northeast: Thundershowers in 70 per cent of the area with isolated heavy to very heavy rains; temperature lows of 23-25 degrees and highs of 28-33 degrees Celsius.
Central: Thundershowers in 70 per cent of the area with isolated heavy rains; temperature lows of 24-26 degrees, highs of 34-35 degrees Celsius.
East: Thundershowers in 70 per cent of the area with isolated heavy to very heavy rains; temperature lows of 23-26 degrees, highs of 29-34 degrees Celsius; waves 1-2 metres high and over 2 metres during thundershowers.
South (east coast): Thundershowers in 60 per cent of the area; temperature lows of 24-25 degrees, highs of 32-34 degrees Celsius; waves a metre high and 1-2 metres during thundershowers.
South (west coast): Thundershowers in 80 per cent of the area with isolated heavy to very heavy rains; temperature lows of 22-26 degrees, highs of 28-32 degrees Celsius; waves 1-2 metres high and over 2 metres during thundershowers.
Bangkok and surrounding areas: Thundershowers in 60 per cent of the area with isolated heavy rains; temperature lows of 26-27 degrees, highs of 32-35 degrees Celsius.