Temperatures in Dubai and Abu Dhabi will reach the mid-30s on Sunday, with the highest temperatures in the UAE likely to hit 41°C.
In Dubai, the maximum will be 35°C and in Abu Dhabi the forecast is for a high of 36°C.
Along the coast and islands, the maximum is likely to be 37°C with 85 per cent humidity, and the mountains are expected to hit 29°C with 60 per cent humidity.
The interior is expected to reach 41°C with up to 80 per cent humidity.
The National Centre of Meteorology said Sunday would be fair in general, with low cloud appearing by morning.
There could be convective clouds by afternoon over the mountains.
Light to moderate winds are forecast, freshening at times and causing blowing dust.
The sea will be slight in the Arabian Gulf and Oman Sea.