Given that he lived, more than a millenium before the rise of modern science I would have thought that Augustine would not have not had much to say about science or the relationship of science and Christianity.
However, I recently learnt this was not the case and that he had some important, perhaps timeless, insights. Even in his time there were some who conflated their theology with some scientific "theory".
Here is one quote, brought to my attention by Luke Glanville.
Whenever I hear a brother Christian talk in such a way as to show that he is ignorant of these scientific matters and confuses one thing with another, I listen with patience to his theories and think it no harm to him provided that he holds no beliefs unworthy of you, O Lord, who are the Creator of them all. The danger lies in thinking that such knowledge is part and parcel of what he must believe to save his soul and in presuming to make obstinate declarations about things of which he knows nothing.Augustine, Confessions, Book V, page 96.