We could post the link to the pages showing the average temperatures and precipitations for various places in Thailand, but I'm afraid everybody would keep on asking What's the weather like in August in Pattaya?
For instance :
Bangkok Phuket Chiang_Mai Pattaya Koh_Samui Hua_Hin Udon_Thani
Strangely there isn't Krabi, but we can assume the same weather pattern as Phuket....