I wouldn't worry too much about it, though I'd stay between Warrenton and the bridge where I could easily head back into the marina (launch at Warrenton). Most mornings are not too bad weather wise, but it does usually pick up a bit by noonish (not always, but usually). There was a guy trolling around in a kayak this week, he wasn't having any trouble with rough water. That said, I sure wouldn't head out to bouy 10 itself, it can turn into nasty water pretty quickly and it would be an ugly run back taking waves over the bow of your boston whaler... but there's always somebody that thinks that's a good idea!