Moon · September 2025
Moon calendar for Great Falls, Montana, United States: September 2025
Daily moon phases, illumination, moonrise and moonset in Great Falls, Montana, United States for September 2025. Full moon: September 7, 2025. All times are shown in the local time of Great Falls, Montana, United States.
Full moonSunday, September 7, 2025, 1:53 PM
New moonSunday, September 21, 2025, 10:49 AM
| Day | Phase | Illumination | Moonrise | Moonset |
|---|---|---|---|---|
| 1 | Waxing Gibbous | 65% | 4:24 PM | 12:06 AM |
| 2 | Waxing Gibbous | 74% | 5:27 PM | 12:53 AM |
| 3 | Waxing Gibbous | 82% | 5:55 PM | 1:59 AM |
| 4 | Waxing Gibbous | 89% | 6:23 PM | 3:19 AM |
| 5 | Waxing Gibbous | 95% | 6:43 PM | 4:22 AM |
| 6 | Waxing Gibbous | 99% | 7:24 PM | 5:39 AM |
| 7 | Full Moon | 100% | 7:36 PM | 6:55 AM |
| 8 | Waning Gibbous | 99% | 7:45 PM | 8:18 AM |
| 9 | Waning Gibbous | 95% | 8:11 PM | 9:37 AM |
| 10 | Waning Gibbous | 89% | 8:22 PM | 11:03 AM |
| 11 | Waning Gibbous | 80% | 8:38 PM | 12:24 PM |
| 12 | Waning Gibbous | 70% | 9:26 PM | 1:57 PM |
| 13 | Last Quarter | 59% | 10:02 PM | 3:33 PM |
| 14 | Last Quarter | 47% | 11:00 PM | 4:32 PM |
| 15 | Waning Crescent | 36% | — | 5:38 PM |
| 16 | Waning Crescent | 25% | 12:16 AM | 6:14 PM |
| 17 | Waning Crescent | 16% | 1:37 AM | 6:31 PM |
| 18 | Waning Crescent | 9% | 2:58 AM | 7:00 PM |
| 19 | Waning Crescent | 4% | 4:19 AM | 7:28 PM |
| 20 | New Moon | 1% | 5:36 AM | 7:34 PM |
| 21 | New Moon | 0% | 6:32 AM | 7:40 PM |
| 22 | New Moon | 1% | 7:50 AM | 7:55 PM |
| 23 | Waxing Crescent | 4% | 9:01 AM | 8:16 PM |
| 24 | Waxing Crescent | 9% | 10:12 AM | 8:25 PM |
| 25 | Waxing Crescent | 15% | 11:23 AM | 8:46 PM |
| 26 | Waxing Crescent | 22% | 12:20 PM | 9:32 PM |
| 27 | Waxing Crescent | 30% | 1:31 PM | 10:01 PM |
| 28 | Waxing Crescent | 39% | 2:20 PM | 10:40 PM |
| 29 | First Quarter | 49% | 3:15 PM | 11:46 PM |
| 30 | First Quarter | 58% | 3:53 PM | — |
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Frequently asked questions
When is the full moon in September 2025 in Great Falls, Montana, United States?
The full moon peaks on Sunday, September 7, 2025, 1:53 PM (local time).
When is the new moon in September 2025?
The new moon falls on Sunday, September 21, 2025, 10:49 AM (local time) — the darkest nights of the month, best for stargazing.
Data: Meeus astronomical algorithms. How we calculate this
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