Moon · September 2027
Moon calendar for Boulder, Colorado, United States: September 2027
Daily moon phases, illumination, moonrise and moonset in Boulder, Colorado, United States for September 2027. Full moon: September 15, 2027. All times are shown in the local time of Boulder, Colorado, United States.
Full moonWednesday, September 15, 2027, 9:52 PM
New moonWednesday, September 29, 2027, 5:45 PM
| Day | Phase | Illumination | Moonrise | Moonset |
|---|---|---|---|---|
| 1 | Waxing Crescent | 2% | 7:30 AM | 8:18 PM |
| 2 | Waxing Crescent | 6% | 8:26 AM | 8:30 PM |
| 3 | Waxing Crescent | 12% | 9:40 AM | 9:22 PM |
| 4 | Waxing Crescent | 20% | 10:40 AM | 9:38 PM |
| 5 | Waxing Crescent | 30% | 12:00 PM | 10:19 PM |
| 6 | Waxing Crescent | 39% | 1:14 PM | 11:00 PM |
| 7 | First Quarter | 49% | 2:12 PM | 11:45 PM |
| 8 | First Quarter | 59% | 3:02 PM | — |
| 9 | Waxing Gibbous | 69% | 3:44 PM | 12:33 AM |
| 10 | Waxing Gibbous | 77% | 4:23 PM | 1:40 AM |
| 11 | Waxing Gibbous | 85% | 4:52 PM | 2:31 AM |
| 12 | Waxing Gibbous | 91% | 5:33 PM | 3:40 AM |
| 13 | Waxing Gibbous | 95% | 5:44 PM | 4:31 AM |
| 14 | Waxing Gibbous | 98% | 6:13 PM | 5:39 AM |
| 15 | Full Moon | 100% | 6:26 PM | 6:30 AM |
| 16 | Full Moon | 99% | 6:41 PM | 7:39 AM |
| 17 | Waning Gibbous | 97% | 7:27 PM | 8:34 AM |
| 18 | Waning Gibbous | 92% | 7:40 PM | 9:44 AM |
| 19 | Waning Gibbous | 86% | 8:17 PM | 11:02 AM |
| 20 | Waning Gibbous | 78% | 8:44 PM | 12:15 PM |
| 21 | Waning Gibbous | 68% | 9:41 PM | 1:32 PM |
| 22 | Last Quarter | 57% | 10:31 PM | 2:24 PM |
| 23 | Last Quarter | 45% | 11:51 PM | 3:33 PM |
| 24 | Waning Crescent | 34% | — | 4:15 PM |
| 25 | Waning Crescent | 23% | 1:20 AM | 4:46 PM |
| 26 | Waning Crescent | 14% | 2:25 AM | 5:31 PM |
| 27 | Waning Crescent | 7% | 3:43 AM | 5:47 PM |
| 28 | Waning Crescent | 2% | 5:03 AM | 6:19 PM |
| 29 | New Moon | 0% | 6:18 AM | 6:31 PM |
| 30 | New Moon | 1% | 7:33 AM | 7:22 PM |
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Frequently asked questions
When is the full moon in September 2027 in Boulder, Colorado, United States?
The full moon peaks on Wednesday, September 15, 2027, 9:52 PM (local time).
When is the new moon in September 2027?
The new moon falls on Wednesday, September 29, 2027, 5:45 PM (local time) — the darkest nights of the month, best for stargazing.
Data: Meeus astronomical algorithms. How we calculate this
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