When Is The Harvest Moon 2025. In 2025, the harvest moon will occur on march 25 at 07:00 gmt (in the southern hemisphere) and on september 18 at 02:34. Harvest moons usually occur in september, however, due to the overlap between the gregorian calendar and the lunar cycle,.
It then reaches peak illumination at 10:34 p.m. Full moon in september 2025:
