Moon calendar
Moon phases in September 2025
In September 2025 the full moon falls on 7 September at 18:09 UTC, and the new moon on 21 September. Every night of the month with its phase and how much of the Moon is lit, computed from the same engine the rest of the site runs on.
The exact moments
- Full Moon
- Last Quarter
- New Moon
- First Quarter
Times are UTC. A phase is a moment, not a night: the Moon is “full” at one instant, and looks full for a day either side of it. The live calendar works these out for your own clock and, if you let it, your own horizon.
Every night in September 2025
| Date | Phase | Lit |
|---|---|---|
| Mon 1 | First Quarter | 57% |
| Tue 2 | Waxing Gibbous | 67% |
| Wed 3 | Waxing Gibbous | 76% |
| Thu 4 | Waxing Gibbous | 84% |
| Fri 5 | Waxing Gibbous | 91% |
| Sat 6 | Waxing Gibbous | 96% |
| Sun 7 | Full Moon Full Moon 18:09 UTC | 99% |
| Mon 8 | Full Moon | 100% |
| Tue 9 | Waning Gibbous | 98% |
| Wed 10 | Waning Gibbous | 93% |
| Thu 11 | Waning Gibbous | 86% |
| Fri 12 | Waning Gibbous | 77% |
| Sat 13 | Waning Gibbous | 66% |
| Sun 14 | Last Quarter Last Quarter 10:34 UTC | 55% |
| Mon 15 | Last Quarter | 44% |
| Tue 16 | Waning Crescent | 33% |
| Wed 17 | Waning Crescent | 23% |
| Thu 18 | Waning Crescent | 15% |
| Fri 19 | Waning Crescent | 8% |
| Sat 20 | Waning Crescent | 3% |
| Sun 21 | New Moon New Moon 19:54 UTC | 1% |
| Mon 22 | New Moon | 0% |
| Tue 23 | Waxing Crescent | 1% |
| Wed 24 | Waxing Crescent | 5% |
| Thu 25 | Waxing Crescent | 9% |
| Fri 26 | Waxing Crescent | 16% |
| Sat 27 | Waxing Crescent | 23% |
| Sun 28 | Waxing Crescent | 31% |
| Mon 29 | First Quarter First Quarter 23:54 UTC | 41% |
| Tue 30 | First Quarter | 50% |
Illumination is taken at 00:00 UTC on each date. It changes by a percent or two over a day, which is why the site’s own nightly card computes it for the evening you are actually standing in.
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2025
September in other years