- 4 Jul, 22:01 Vilnius time: full moon, traditionally the Buck Moon.
- 11 Jul, 14:49 Vilnius time: last quarter.
- 19 Jul, 16:40 Vilnius time: new moon.
- 27 Jul, 13:34 Vilnius time: first quarter.
- During July 2031 the Moon passes through all eight phases. One full cycle takes about 29.5 days.
- The next full moon after this month is on 3 August 2031 (August 2031).
Moon phase times, July 2031
The four principal phases are moments, not whole days. Times are given in UTC and in Europe/Vilnius time.
| Date | Phase | Europe/Vilnius | UTC |
|---|---|---|---|
| Fri 4 Jul | Full moon · Buck Moon | 22:01 | 19:01 |
| Fri 11 Jul | Last quarter | 14:49 | 11:49 |
| Sat 19 Jul | New moon | 16:40 | 13:40 |
| Sun 27 Jul | First quarter | 13:34 | 10:34 |
The sky: July 2031
Planets and sky events this month, as seen in London. The Moon's phases are in the calendar above.
Planets visible (mid-month)
Events
| Thu 3 Jul | The Moon near Jupiter | About 1.7° apart. Look for Jupiter next to the Moon. |
| Tue 15 Jul | Mercury farthest from the Sun | 27° in the evening sky. Too low at this latitude this time, hard to see. |
| Wed 16 Jul | The Moon near Saturn | About 0.4° apart. Look for Saturn next to the Moon. |
| Mon 21 Jul | The Moon near Mercury | About 3.1° apart, but Mercury is not visible that night. |
| Tue 22 Jul | The Moon near Venus | About 1.5° apart, but Venus is not visible that night. |
| Fri 25 Jul | Mercury and Venus together | 1.6° apart, but not in a dark sky. |
| Mon 28 Jul | The Moon near Mars | About 1.1° apart. Look for Mars next to the Moon. |
| Tue 29 Jul | Southern Delta Aquariids meteor shower peak | Up to 25 meteors an hour in a perfect sky. The Moon is 80% lit: only the brightest meteors will show. |
| Tue 29 Jul | Alpha Capricornids meteor shower peak | Up to 5 meteors an hour in a perfect sky. The Moon is 80% lit: only the brightest meteors will show. |
| Wed 30 Jul | The Moon near Jupiter | About 1.7° apart. Look for Jupiter next to the Moon. |
How to read the moon calendar
Each day shows its date, the share of the Moon’s disc that is lit at noon, and the Moon’s shape that day. When a full moon, new moon or quarter falls on a day, it is named at the bottom of the cell.
Illumination is the part of the disc lit by the Sun. It grows from new moon to full moon (waxing) and shrinks from full moon to new moon (waning). Each day opens its own page with every signal for that date.
Full moon dates 2031
| Date | Time (UTC) | Traditional name | |
|---|---|---|---|
| Wed 8 Jan | 18:25 | Wolf Moon | next |
| Fri 7 Feb | 12:46 | Snow Moon | |
| Sun 9 Mar | 04:29 | Worm Moon | |
| Mon 7 Apr | 17:21 | Pink Moon | |
| Wed 7 May | 03:39 | Flower Moon | |
| Thu 5 Jun | 11:58 | Strawberry Moon | |
| Fri 4 Jul | 19:01 | Buck Moon | |
| Sun 3 Aug | 01:45 | Sturgeon Moon | |
| Mon 1 Sep | 09:20 | Harvest Moon | |
| Tue 30 Sep | 18:57 | Blue Moon | |
| Thu 30 Oct | 07:32 | Hunter’s Moon | |
| Sat 29 Nov | 23:18 | Beaver Moon | |
| Sun 28 Dec | 17:33 | Cold Moon |
New moon dates 2031
| Date | Time (UTC) | |
|---|---|---|
| Thu 23 Jan | 04:31 | next |
| Fri 21 Feb | 15:48 | |
| Sun 23 Mar | 03:49 | |
| Mon 21 Apr | 16:57 | |
| Wed 21 May | 07:17 | |
| Fri 20 Jun | 22:24 | |
| Sat 19 Jul | 13:40 | |
| Mon 18 Aug | 04:32 | |
| Tue 16 Sep | 18:47 | |
| Thu 16 Oct | 08:20 | |
| Fri 14 Nov | 21:09 | |
| Sun 14 Dec | 09:05 |
The eight moon phases explained
Four principal phases are exact instants; the four in between are the days that connect them.
Solar and lunar eclipses in 2031
No eclipse data for 2031.
The waning moon is traditionally a time for finishing
Questions people ask
When is the full moon in July 2031?
The full moon is on 4 July 2031. Its traditional name is the Buck Moon. The exact time is in the table on this page.
When is the new moon in July 2031?
The new moon is on 19 July 2031. The Moon can’t be seen that night: it sits between Earth and the Sun with its lit side turned away.
What do the percentages mean?
They show how much of the Moon’s disc is lit at noon. 0% is new moon, 100% is full moon and 50% is a quarter.
Why does another calendar give a different date?
A phase is a moment. When it falls near midnight, the date can differ by one day between time zones. This calendar uses Europe/Vilnius time for the days.
How often is there a full moon?
About every 29.5 days. Some months have two; the second is called a Blue Moon.
- Jean Meeus, Astronomical Algorithms, 2nd ed., Willmann-Bell, 1998, chapters 48 and 49.
- NASA Eclipse Web Site (eclipse dates and visibility).
Numbers update through the day from public sources. The text for each day is written from that day’s data and checked by the editor. Every past day keeps its own page in the archive.