No, there’s no evidence that suggests that Augustine knew Hebrew, and based on his own comments he did not. Throughout a work such as his exposition of the Psalms, he will occasionally refer to a Hebrew word or the Hebrew, but his knowledge is not first-hand (and he is not claiming that it is), but comes by way of consulting others or particular texts.

In De Doctrina 2, 22 he appears to lack Hebrew, and speaks of the importance of the Septuagint as the basis for a correct understanding of the Old Testament, and that the Latin versions should be held to the Greek as a standard.

Knowledge of Hebrew was fairly rare among early Christian writers. Origen, certainly; Jerome, of course. But apart from those two, among Greek and Latin church figures in the first 5 centuries, it is virtually absent.