May is a long month and has two full moons. But the second full moon of May is a rare blue moon and will also be a micro moon, occurring on the last day of the month.
The blue moon is set to peak on Sunday, May 31, at 4:45 a.m. ET and 1:45 a.m., and will be visible globally, although cloudy skies may affect visibility. (Isn't that always the case)
The term "blue moon" originated in the 16th century to signify something rare or impossible, and it occurs every 2.5 years, with the last one happening on Aug. 19, 2024.
A micro moon, like the one in May, happens when the moon is at its farthest point from Earth during that month, making it appear smaller than usual.
The next occurrence of two full moons in the same month will be in December 2028. -Cope
rewritten from source: https://www.usatoday.com/story/news/world/2026/05/24/may-blue-moon-2026/90173303007/