How thick a wetsuit?

[Under-Exposed]

I am heading off to the Coral Sea in a week, for 4 days on a liveaboard, where I understand the temps will be 24-5C. I am wondering if there is any point taking my 5mm wetsuit... I have been quite comfortable in it at 21C in Sydney, but am wondering whether the extra 3 or 4C might make it too heavy? Thoughts?

 

[Will]

It depends on you - but if I was doing 4 days of repetitive diving - I think I would definitely want a 5mil

Better a little too warm then too cold..

 

[Tom Winters]

On your 4th or 5th dive of the day, you will appreciate the thickness and resulting warmth. You will also understand why people on liveaboards in tropical waters wear drysuits.