September full moon 2026: When, where and how to see the Harvest Moon

The Harvest Moon will reach its peak illumination on September 21st, 2026, offering prime viewing opportunities across North America. The event occurs when the full moon appears largest and brightest in the post-harvest season due to the Earth’s tilt. Astronomers predict that this year’s Harvest Moon will be particularly striking, appearing exceptionally large and luminous. Peak visibility for most of the United States will occur around 9:37 PM EDT on September 21st, with optimal conditions lasting until sunrise on September 22nd. Skywatchers are encouraged to find a location free from light pollution for the best possible experience observing this celestial phenomenon.