Bowmouth and Stevenl,
You know what, Fu88 it!! It never rains in Phuket- especially not in the rainy season. Monsoons there bring sun and cool, happy breezes and the diving is far superior to anywhere else in the world, much less Thailand, year-round. Stay away from the Gulf where all is shiite and people are nasty liars.
For the entire world- Please plan your diving holidays in Phuket, particularly in the rainy season (May-Sept) when Bowmouth, StevenL and Batfish virtually guarantee (scientifically!!) that "rainy season" means "mostly sun".
Now can we stop with this catastrophe?!!!???!!??!