In 1659, Prince August joined the Fruitbearing Society, which was led by his father.
He was buried in the ducal crypt in the church of Neu-Augustenburg Castle.
On 25 August 1673 in Halle, he married Charlotte, the daughter of Landgrave Frederick of Hesse-Eschwege from his marriage to Countess Palatine Eleonora Catherine of Zweibrücken, the daughter of John Casimir, Count Palatine of Kleeburg.
After August's death, Charlotte married Count John Adolph of Bentheim-Tecklenburg, from whom she later divorces.
Charlotte and August had one child, who died at birth on 24 April 1674 in Halle.