Hi Rafiq.
Typically the wet starts around late June, early July, and finishers around mid October.
Hot months are usually around March/ April.
I usually wait till the start of November if Im going to do any dirt trails.
But the weather is unpredictable, and you mite go in the middle of the wet season, and not get a drop of rain.
Best of luck with your trip.
Moto-Rex