Blue Moon
A second full Moon in the same calendar month.
When and how to watch
The second full moon in a single calendar month
Moon on Sun, May 31, 2026
Lunar 4/15
The Moon on this date is Full Moon, with about 100% of its disk illuminated.
Illumination
100%
Moonrise
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Moonset
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Moonrise and moonset are for Seoul. Moonset is when the Moon that rose this day sets, so it can fall on the next day.
It rises near sunset and crosses the sky through the night at its fullest illumination.
The Moon on May 31, 2026
On May 31, 2026, the Moon was a Full Moon, 14.3 days old and 100% illuminated, in the constellation Scorpius about 405,974 km (252,260 mi) from Earth. The Full Moon fell on this date.
- Phase
- Full Moon
- Illumination
- 100%
- Moon age
- 14.3 days since New Moon
- Distance from Earth
- 405,974 km (252,260 mi)
- Constellation
- Scorpius
- Previous Full Moon
- May 1, 2026
- Next New Moon
- June 15, 2026
- Next Full Moon
- This date
Moon phases around May 31, 2026
| Date | Moon | Lit | Age |
|---|---|---|---|
| 5/28 Thu | Waxing Gibbous | 91% | 11.3d |
| 5/29 Fri | Waxing Gibbous | 95% | 12.3d |
| 5/30 Sat | Waxing Gibbous | 98% | 13.3d |
| 5/31 Sun | Full Moon | 100% | 14.3d |
| 6/1 Mon | Full Moon | 99% | 15.3d |
| 6/2 Tue | Waning Gibbous | 97% | 16.3d |
| 6/3 Wed | Waning Gibbous | 93% | 17.3d |
Values are calculated with Astronomy Engine at 12:00 Korea Standard Time (03:00 UTC) on each date; New and Full Moon dates are in UTC. Moon age counts days since the New Moon; distance is centre to centre.