Moon phase, moonrise and moonset times in Boulder, Colorado, United States
Current local time 2:06:59 PM (UTC-6)
Today, September 17
- Moonrise1:50 AMMoonset4:45 PM
- Moon PhaseWaning crescentIlumination17%
Tomorrow, September 18
- Moonrise2:55 AMMoonset5:22 PM
- Moon PhaseWaning crescentIlumination10%
- Third Quarter14 September4:33 AM
- New Moon21 September1:54 PM
- First Quarter29 September5:53 PM
- Full Moon6 October9:47 PM
- Third Quarter13 October12:12 PM
September 2025 — Moon in Boulder
| Icon | Date | Moonrise | Moonset | Moonrise | Moon phase | Illumination | |
|---|---|---|---|---|---|---|---|
| September 1 | Mon | — | 12:27 AM | 3:52 PM | Waxing gibbous | 64% | |
| September 2 | Tue | — | 1:23 AM | 4:43 PM | Waxing gibbous | 73% | |
| September 3 | Wed | — | 2:24 AM | 5:27 PM | Waxing gibbous | 82% | |
| September 4 | Thu | — | 3:29 AM | 6:05 PM | Waxing gibbous | 89% | |
| September 5 | Fri | — | 4:35 AM | 6:39 PM | Waxing gibbous | 95% | |
| September 6 | Sat | — | 5:41 AM | 7:09 PM | Waxing gibbous | 99% | |
| September 7 | Sun | — | 6:46 AM | 7:37 PM | Full moon | 100% | |
| September 8 | Mon | — | 7:51 AM | 8:04 PM | Waning gibbous | 99% | |
| September 9 | Tue | — | 8:56 AM | 8:32 PM | Waning gibbous | 95% | |
| September 10 | Wed | — | 10:01 AM | 9:02 PM | Waning gibbous | 88% | |
| September 11 | Thu | — | 11:07 AM | 9:35 PM | Waning gibbous | 79% | |
| September 12 | Fri | — | 12:13 PM | 10:14 PM | Waning gibbous | 69% | |
| September 13 | Sat | — | 1:18 PM | 10:58 PM | Waning gibbous | 58% | |
| September 14 | Sun | — | 2:19 PM | 11:50 PM | Third quarter | 47% | |
| September 15 | Mon | — | 3:14 PM | — | Waning crescent | 36% | |
| September 16 | Tue | 12:47 AM | 4:03 PM | — | Waning crescent | 25% | |
| September 17 | Wed | 1:50 AM | 4:45 PM | — | Waning crescent | 17% | |
| September 18 | Thu | 2:55 AM | 5:22 PM | — | Waning crescent | 10% | |
| September 19 | Fri | 4:01 AM | 5:54 PM | — | Waning crescent | 4% | |
| September 20 | Sat | 5:07 AM | 6:23 PM | — | Waning crescent | 1% | |
| September 21 | Sun | 6:12 AM | 6:51 PM | — | New moon | 0% | |
| September 22 | Mon | 7:17 AM | 7:18 PM | — | Waxing crescent | 1% | |
| September 23 | Tue | 8:22 AM | 7:47 PM | — | Waxing crescent | 4% | |
| September 24 | Wed | 9:27 AM | 8:18 PM | — | Waxing crescent | 8% | |
| September 25 | Thu | 10:33 AM | 8:53 PM | — | Waxing crescent | 14% | |
| September 26 | Fri | 11:39 AM | 9:33 PM | — | Waxing crescent | 21% | |
| September 27 | Sat | 12:43 PM | 10:19 PM | — | Waxing crescent | 29% | |
| September 28 | Sun | 1:42 PM | 11:13 PM | — | Waxing crescent | 38% | |
| September 29 | Mon | — | — | 2:36 PM | First quarter | 48% | |
| September 30 | Tue | — | 12:12 AM | 3:23 PM | Waxing gibbous | 57% |
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