If you can get a credit card to fit between your tire and the frame, you will be living life to its fullest.
I try to cram in the widest tire I can get away with. Unless your wheels go badly out of true regularly, or you have a tendency to ride through sticky adhesive mud, or if you ride room for fenders, the official estimates for maximum tire width are usually quite conservative. Also, be aware that the number printed on the sidewall of the tire may be significantly different from what the tire expands to on your rims on your bike with your favorite tire pressure, tube/tubeless content, etc.