The figures
At 18:58 UTC on Tuesday, September 30, 2031 the Moon reaches 7°25' Aries with the Sun opposite at 7°25' Libra. The distance is 373,479 km, 10,921 km closer than the 384,400 km average — near enough to the mean that the apparent size is unremarkable. The degree, 7°25' Aries, places it in the first decan of Aries, on the axis that runs across to Libra. It is the second full Moon inside September 2031, which is what the calendar definition of a blue moon means — a quirk of the lunar month being shorter than the calendar one. It is the 19th of the 25 lunations dated for 2031, and the cycle it belongs to is set out in what a lunation is.
Exact time where you are
That instant — 18:58 UTC on September 30, 2031 — is one moment worldwide, and only the clock reading changes, with summer time applied wherever the local rule puts the date inside it.
| City | Local time | Local date |
|---|---|---|
| New York | 14:58 | 30 September |
| Los Angeles | 11:58 | 30 September |
| London | 19:58 | 30 September |
| Delhi | 00:28 the next day | 1 October |
| Sydney | 04:58 the next day | 1 October |
| Istanbul | 21:58 | 30 September |
Why it is called the Blue Moon
The Blue Moon is the traditional North American and European name for the full Moon of September, and in 2031 it falls on September 30, 2031 at 7°25' Aries. The older alternative is the Harvest Moon. Those names follow the calendar month rather than the zodiac, which is why the 2031 one lands in Aries at 7°25' Aries while other years put it elsewhere.
Which house it falls in for your sign
Counted from each sign as the first house, this full moon at 7°25' Aries falls here:
| Sign | House | What that house covers |
|---|---|---|
| Aries | 1st house | your own bearing, appearance and the first move |
| Taurus | 12th house | rest, solitude, what is behind you and what runs unattended |
| Gemini | 11th house | friends, groups, networks and what you are aiming at |
| Cancer | 10th house | career, public standing and what you are known for |
| Leo | 9th house | distance, study, belief, travel and the long view |
| Virgo | 8th house | shared money, debt, intimacy and what is not said out loud |
| Libra | 7th house | partners, opponents and anyone you deal with one to one |
| Scorpio | 6th house | work, routine, health and the small maintenance of a life |
| Sagittarius | 5th house | play, romance, children and anything you make for its own sake |
| Capricorn | 4th house | home, family, roots and private ground |
| Aquarius | 3rd house | conversation, short trips, siblings and daily information |
| Pisces | 2nd house | money, possessions and what you consider yours |
A full moon in Aries
Anything within a couple of degrees of 7°25' Aries in a natal chart is contacted directly by this one, and so is anything near the same degree of Libra, Cancer or Capricorn, since those are the other three corners of the same cross.
What the full moon of September 30, 2031 marks is a position rather than an event: 7°25' Aries, in the first decan, with the Sun at 7°25' Libra. The house it occupies in your own chart matters more than the sign name, and the table above gives that house for 7°25' Aries, sign by sign.
Where this one sits in the cycle
The lunation before this one fell 14 days earlier and the next follows 16 days after September 30, 2031.
- Before it: the new moon of September 16, 2031
- After it: the new moon of October 16, 2031
- The last full moon in Aries: October 11, 2030
Questions people ask about this
What time is the full moon on September 30, 2031?
18:58 UTC on September 30, 2031; the table above converts that single instant to six local clocks.
What sign is this full moon in?
7°25' Aries — the first decan. The chart reading for September 30, 2031 works from that degree rather than from the sign name on its own.
Is this a supermoon?
No: 373,479 km, which is 10,921 km off the average and not near enough to perigee to qualify.
Does a full moon cause anything?
No. On September 30, 2031 the Moon simply reaches 7°25' Aries; what the chart gives is a position and a house, not an event.