Verkar ju klokt "Expect very similar weather in July as you would in June. Hot and wet, though not as wet as the west coast. The northern stretch of the Gulf Coast, including towns like Prachuap Khiri Khan, Hua Hin and Phetburi will be significantly drier than Ko Samui, Ko Pha Ngan and Ko Tao. Even though there will be rain on the islands in July, there will still be a lot of sun too, and, for dedicated island time, these islands remain your best bet in Thailand weather-wise."