Situated smack in the middle of the great Arabian desert, Dubai stays hot for most of the year. Temperatures touch the 50 degree celsius mark. It is literally impossible to walk out on the roads during peak summer that often occurs during the months of April and May.
The ideal time to visit would be around Nov-Dec and this is the time when Dubai stays pleasant with bearable temperatures.
So while planning your trip to Dubai , make sure to pack loads of thin and airy cotton clothes and leave behind those leather jackets and jerkins. Wearing sleeveless clothes is a good idea to combat the extreme heat at Dubai. But ensure that you do not venture out too much in these clothes or you till get sun burnt. So dress well. Dress practically.