Sure its big enough. Most of my early life I fished in Puget Sound in boats smaller than that.
You must become a student of the weather.
I now have a 15' Jon/25 Mariner which handles bad water on a resivour. I got caught in a front with a dead motor and I was absolutely amazed at how much water that thing picked up in a driving rain.
It's enough to make a V-bottom tip pretty good if the front seat 200 Pounder leans over far enough to make all that water shift. If it tip's far enough for the gunn'l to go under, the rest of the boat will follow suit. Your gonna get real wet and lose some gear. [-X
That's extreme, but its one of the answers to your question.
PS: After a couple scares, I wear my PFD, and strap my Kill switch on, whenever the boat is moving.