Moon phases in 2031: full calendar
All 49 primary Moon phases in 2031, with the exact date and time in Universal Time (UT). The first full moon is 8 January at 18:26 UT; the first new moon is 23 January at 04:31 UT.
Time-zone note. These are geocentric phase instants in UT, as supplied by the U.S. Naval Observatory. Your local clock — and occasionally your local calendar date — may differ after conversion.
2031 Moon phase calendar by month
2031 contains 49 primary lunar phases: 13 full moons and 12 new moons. September has two full moons. No calendar month has two new moons.
| Month | Primary phases in Universal Time |
|---|---|
| January |
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| February |
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| March |
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| April |
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| May |
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| June |
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| July |
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| August |
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| September |
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| October |
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| November |
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| December |
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Full moon dates in 2031
September has two full moons.
New moon dates in 2031
No month contains two new moons.
What stands out in 2031
- The year opens with a full moon on Wednesday, 8 January at 18:26 UT and closes with a full moon on Sunday, 28 December at 17:33 UT.
- The shortest interval between consecutive primary phases is about 6.6 days, from the full moon on 5 June at 11:58 UT to the last quarter on 12 June at 02:20 UT.
- The longest interval is about 8.2 days, from the first quarter on 30 January at 07:43 UT to the full moon on 7 February at 12:46 UT.
- September has two full moons. No month contains two new moons.
Source and method
The phase dates are a checked-in snapshot of the official USNO annual Moon phases API result for 2031, retrieved 2026-08-14, API version 4.0.1. USNO describes these as computed astronomical data for public information and general use. SkyClock does not call the API during a page build or visit.
USNO asks for appropriate credit when its public information is copied or distributed; see its privacy and distribution notice. These computed times are useful for planning, not navigation, legal certification or a claim about local Moon visibility.
FAQ
When is the first full moon of 2031?
The first full moon of 2031 is Wednesday, 8 January 2031 at 18:26 UT. The final full moon is Sunday, 28 December 2031 at 17:33 UT. Both times are Universal Time (UT).
How many full moons are there in 2031?
There are 13 full moons in 2031. September has two full moons.
How many new moons are there in 2031?
There are 12 new moons in 2031. No month contains two new moons.
Why can a Moon phase date differ in my time zone?
Every phase on this page is listed in Universal Time. Converting the instant to a local time zone can move it to the previous or next calendar date, but it is still the same astronomical instant.