Boulder, CO sky calendar · September 2027
Full moon: Wed, Sep 15. New moon: Wed, Sep 29. Sunrise moves from 6:28 AM to 6:56 AM, sunset from 7:32 PM to 6:45 PM. 2 sky events this month (below). Times are local (MDT).
| Date | Sunrise | Sunset | Moonrise | Moonset | Moon |
|---|---|---|---|---|---|
| Wed, Sep 1 | 6:28 AM | 7:32 PM | 7:37 AM | 7:53 PM | Waxing crescent · 2% |
| Thu, Sep 2 | 6:29 AM | 7:31 PM | 8:51 AM | 8:20 PM | Waxing crescent · 6% |
| Fri, Sep 3 | 6:30 AM | 7:29 PM | 10:04 AM | 8:48 PM | Waxing crescent · 12% |
| Sat, Sep 4 | 6:31 AM | 7:27 PM | 11:16 AM | 9:20 PM | Waxing crescent · 21% |
| Sun, Sep 5 | 6:32 AM | 7:26 PM | 12:26 PM | 9:56 PM | Waxing crescent · 30% |
| Mon, Sep 6 | 6:33 AM | 7:24 PM | 1:32 PM | 10:38 PM | Waxing crescent · 40% |
| Tue, Sep 7 | 6:34 AM | 7:22 PM | 2:33 PM | 11:27 PM | First quarter · 50% |
| Wed, Sep 8 | 6:35 AM | 7:21 PM | 3:25 PM | — | Waxing gibbous · 60% |
| Thu, Sep 9 | 6:36 AM | 7:19 PM | 4:10 PM | 12:22 AM | Waxing gibbous · 69% |
| Fri, Sep 10 | 6:37 AM | 7:18 PM | 4:47 PM | 1:21 AM | Waxing gibbous · 77% |
| Sat, Sep 11 | 6:38 AM | 7:16 PM | 5:18 PM | 2:22 AM | Waxing gibbous · 85% |
| Sun, Sep 12 | 6:39 AM | 7:14 PM | 5:44 PM | 3:23 AM | Waxing gibbous · 91% |
| Mon, Sep 13 | 6:40 AM | 7:13 PM | 6:08 PM | 4:24 AM | Waxing gibbous · 95% |
| Tue, Sep 14 | 6:40 AM | 7:11 PM | 6:30 PM | 5:25 AM | Waxing gibbous · 99% |
| Wed, Sep 15 | 6:41 AM | 7:09 PM | 6:51 PM | 6:25 AM | Full moon · 100% |
| Thu, Sep 16 | 6:42 AM | 7:08 PM | 7:13 PM | 7:26 AM | Waning gibbous · 99% |
| Fri, Sep 17 | 6:43 AM | 7:06 PM | 7:36 PM | 8:28 AM | Waning gibbous · 97% |
| Sat, Sep 18 | 6:44 AM | 7:04 PM | 8:03 PM | 9:33 AM | Waning gibbous · 92% |
| Sun, Sep 19 | 6:45 AM | 7:03 PM | 8:35 PM | 10:40 AM | Waning gibbous · 86% |
| Mon, Sep 20 | 6:46 AM | 7:01 PM | 9:14 PM | 11:48 AM | Waning gibbous · 78% |
| Tue, Sep 21 | 6:47 AM | 6:59 PM | 10:02 PM | 12:56 PM | Waning gibbous · 68% |
| Wed, Sep 22 | 6:48 AM | 6:58 PM | 11:00 PM | 1:59 PM | Waning gibbous · 58% |
| Thu, Sep 23 | 6:49 AM | 6:56 PM | — | 2:55 PM | Last quarter · 47% |
| Fri, Sep 24 | 6:50 AM | 6:54 PM | 12:08 AM | 3:43 PM | Waning crescent · 35% |
| Sat, Sep 25 | 6:51 AM | 6:53 PM | 1:22 AM | 4:22 PM | Waning crescent · 25% |
| Sun, Sep 26 | 6:52 AM | 6:51 PM | 2:39 AM | 4:56 PM | Waning crescent · 15% |
| Mon, Sep 27 | 6:53 AM | 6:49 PM | 3:55 AM | 5:25 PM | Waning crescent · 8% |
| Tue, Sep 28 | 6:54 AM | 6:48 PM | 5:11 AM | 5:52 PM | Waning crescent · 3% |
| Wed, Sep 29 | 6:55 AM | 6:46 PM | 6:25 AM | 6:18 PM | New moon · 0% |
| Thu, Sep 30 | 6:56 AM | 6:45 PM | 7:39 AM | 6:46 PM | Waxing crescent · 1% |
Sky events this month
- Wed, Sep 15 5:04 PMFull moon
- Fri, Sep 24 4:06 PMMercury farthest from the Sun in the evening sky26° from the Sun: the best time to see it, low in the west after sunset
Month by month
Calculated with Astronomy Engine (MIT license).