Well, June 20th is going to be the longest day in the northern hemisphere in 2012. This is known as summer solstice during which our sun directly shines on the Tropic of Cancer. And we all know that the UAE is positioned very close to the Tropics of Cancer. The length of the day in Dubai will be 13 hours, 42 minutes, and 46 seconds on June 20th and 21st, 2012.
Although the next days will be slightly shorter, the hottest days won’t arrive until July and early August as the northern hemisphere hasn’t yet reached its maximum seasonal heat (seasonal lag).
It is interesting that in the southern hemisphere, it is the complete opposite with Winter solstice and the shortest day.