Astronomers Confirm Full Moon May 2026 Illumination Peak for May 31.
(CAPE CANAVERAL, FL) — The National Aeronautics and Space Administration (NASA) has officially confirmed that the full moon for May 2026 will reach its peak illumination at precisely 11:45 p.m. Eastern Daylight Time on Sunday, May 31. According to agency officials, this lunar event will be the final full moon of the astronomical spring, traditionally known as the Flower Moon, marking a transition into the summer solstice. Observers in the Western Hemisphere can expect optimal viewing conditions, with the moon appearing fully illuminated for approximately three days surrounding this date, from Saturday evening to Tuesday morning. Scientists advise that the best visibility will occur at moonrise, when atmospheric refraction can produce a striking orange-tinted appearance. This specific full moon is also predicted to coincide with a minor lunar apogee, resulting in a slightly smaller apparent diameter than average for 2026.