Autumn equinox and Harvest Moon to occur in September 2026

September 2026 features several notable astronomical events, including the autumn equinox and the Harvest Moon. The astronomical autumn begins on September 23, when the sun is positioned directly over the equator, resulting in nearly equal day and night lengths globally.

Following the equinox, the full moon occurring on September 26 is traditionally known as the Harvest Moon. This name stems from historical agricultural practices where the extra moonlight allowed farmers to continue working in their fields after sunset. In 2026, the full moon reaches its peak at approximately 13:49 Brasília time.

The lunar cycle for the month also includes a new moon on September 11 and a waxing crescent phase on September 18. Earlier in the month, the moon was in a new phase with approximately 31% visibility.