It is not suggested. It is definitely bad for your eyes especially when the sun is very strong. If you have to go out in hot days, then I strongly suggest you to take some measures such as drop your eyes with some mild eye drops or give your eyes a cool compress, Trust me, that can be very useful and I use this way a lot. But I still don' t suggest u to do so cuz your eyes will become very dry after this surgery if you go to the sun.