May 2026 is about to deliver an incredible celestial double-feature. Skywatchers are gearing up for a highly unusual lunar schedule that packs two full moons into a single calendar month. This anomaly means the year 2026 will host 13 total full moons instead of the standard 12.
The event kicks off immediately on Friday, May 1. The traditional Flower Moon reaches peak illumination at 1:23 P.M. EDT (17:23 UTC). The month will then wrap up with a highly anticipated Blue Moon on Sunday, May 31, peaking at 4:45 A.M. EDT (08:45 UTC). Look up tonight. The skies are changing.
The mechanics behind this are purely mathematical. A complete lunar phase cycle lasts approximately 29.5 days. Because May has 31 days, a full moon on the very first day leaves just enough room for a second one to squeeze in before the calendar flips. This rare schedule creates a ton of viewing opportunities into a few short weeks, according to CNET’s breakdown of the rare occurrence of two full moons and the May 31 Blue Moon timing.
The moon will not be alone. A brilliant planetary alignment will dominate the evening sky later in the month. Venus and Jupiter will shine prominently in the west-northwest. They are steadily closing the gap toward a planned June conjunction. Mercury joins the show late in the month. It emerges in the western evening sky alongside Venus and Jupiter roughly 10 days after its May 14 superior conjunction.
Observers tracking planetary science will want to watch the western horizon closely. Skywatchers can expect a spectacular lineup of Mercury, Venus, and Jupiter in the evening sky, as well as the Micromoon apogee status hitting on June 1.
What This 13-Moon Calendar Means for Skywatchers
This lunar rhythm completely dictates the viewing schedule for the rest of the year. The May 31 event marks the first Blue Moon the world has witnessed in nearly two years. The last time this celestial alignment occurred was in August 2024.
The May 31 Blue Moon also officially classifies as a “Micromoon.” The moon reaches its apogee—its farthest physical point from Earth in its orbit—on June 1. It is a striking visual shift. The May 31 full moon will appear slightly smaller and dimmer than a standard full moon or supermoon. You won’t get another chance to see a double-moon month anytime soon. Grab your telescopes.