I walked the Le Puy route solo (in September, both years) and never had any reasons for concern about physical safety. However, do be aware that August can be AWFULLY hot (high 90's Fahrenheit, I think that's high 30's Celsius). Planning for water and walking in the cooler parts of the day will be helpful. Also, since there are fewer walkers, some gites close. So booking ahead (or at least calling ahead to verify that places are open) will be important.
Bon chemin!