As you have already found, here on Travelfish there is so much information. And, there are 'members' who are willing to pass on knowledge. However, those members hope that those asking questions have read some of the information available on Travelfish.
To your question, I suggest the information is already here on Travelfish. In the first instance, go to the 'nation' links. I know they are poorly placed, but if you link on Thailand you'll see a blue bold link to weather...
This second page has general answers about weather. On the right hand side of this second page, you'll see links to discussions on weather. Some of the recent topics listed are:
Weather discussions on the forum
» Weather in July and August in SE Asia?
» Thailand's weather in June?
» Ko Lanta's weather in July?
» Thailand's weather in June and July?
» Weather in August?
» Phuket's weather in August and September?
If you go to these 'links', I'm sure you'll get more information there than if anyone gives you a specific answer here.
Why do I make this suggestion? Because if you go to the links, you'll see what people are saying about the weather, AND about the tourist venues in the low, low, low season. This second point has implications for your choices of activities, transport, accommodation.
Look, big Ko Chang and its neighbours are some of the wettest places in Thailand - go to TRAVELFISH'S excellent interactive weather map.
Having said that, I'm a weather nerd and have been checking wet season posts from all over for years - and there have been plenty from big Chang saying they had a good visit in mid-year. Apparently when it rains it REALLY rains - but you still get the sunny/scattered cloud in between which has made my wet season trips in the Andaman good value, particularly since prices are discounted and crowds are dowm.
However I do urge you to read the HOW NOT TO DROWN page in the link below. All big Chang's beaches fast west into the monsoon winds and after a period of heavy blows (not every day or even predominant) you can get big swells and dangerous rip-currents.
KC very wet then and a lot of stuff is closed down too.
Koh Kood may get less rain being flatter - but you will have to get there the ferry from Ban Bao on KC may be suspended - there is a service from the mainland down the coast from Leam Gnop a bit. - many of there resorts simply close - check first
#5 khunwilko has been a member since 27/1/2007. Posts: 560