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stevenl:October can be really nice, with excellent weather and good viz. And even better: the chances of meeting lots of divers under water are nil. If the weather is not very nice, still the viz will remain excellent.
I'd go for it, the worst thing that can happen to you is rain, but still very nice diving.
stevenl:Sunrise, I seem to remember a discussion we had earlier where you were very much opposed to my idea to send divers to the Similans from June till September?
jiptha:yeah, defitnitely wait until at least after new year when it gets really crowded and all you get to put into the log book is 'loads of divers'!