Moon calendar, September 2026
The phase for every night of September, computed from the same astronomy the Gibbous app uses. Tap any principal phase below for its exact instant.
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Phases shown for midday UTC each date; the disc you see tonight may differ slightly by hour and hemisphere. In the Southern Hemisphere the lit side appears mirrored.
| Phase | Instant (UTC) | Notes |
|---|---|---|
| Last quarter | September 4, 2026, 07:51 UTC | |
| New moon | September 11, 2026, 03:26 UTC | |
| First quarter | September 18, 2026, 20:43 UTC | |
| Full moon (Harvest Moon) | September 26, 2026, 16:51 UTC |
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