Boulder, CO sky calendar · May 2027
Full moon: Thu, May 20. New moon: Thu, May 6. Sunrise moves from 6:01 AM to 5:34 AM, sunset from 7:55 PM to 8:23 PM. 3 sky events this month (below). Times are local (MDT).
| Date | Sunrise | Sunset | Moonrise | Moonset | Moon |
|---|---|---|---|---|---|
| Sat, May 1 | 6:01 AM | 7:55 PM | 3:26 AM | 3:10 PM | Waning crescent · 23% |
| Sun, May 2 | 5:59 AM | 7:56 PM | 3:47 AM | 4:13 PM | Waning crescent · 16% |
| Mon, May 3 | 5:58 AM | 7:57 PM | 4:10 AM | 5:19 PM | Waning crescent · 9% |
| Tue, May 4 | 5:57 AM | 7:58 PM | 4:34 AM | 6:27 PM | Waning crescent · 4% |
| Wed, May 5 | 5:56 AM | 7:59 PM | 5:02 AM | 7:39 PM | Waning crescent · 1% |
| Thu, May 6 | 5:55 AM | 8:00 PM | 5:36 AM | 8:54 PM | New moon · 0% |
| Fri, May 7 | 5:54 AM | 8:01 PM | 6:18 AM | 10:07 PM | Waxing crescent · 2% |
| Sat, May 8 | 5:52 AM | 8:02 PM | 7:11 AM | 11:14 PM | Waxing crescent · 7% |
| Sun, May 9 | 5:51 AM | 8:03 PM | 8:15 AM | — | Waxing crescent · 14% |
| Mon, May 10 | 5:50 AM | 8:04 PM | 9:27 AM | 12:11 AM | Waxing crescent · 23% |
| Tue, May 11 | 5:49 AM | 8:05 PM | 10:43 AM | 12:57 AM | Waxing crescent · 34% |
| Wed, May 12 | 5:48 AM | 8:06 PM | 11:58 AM | 1:34 AM | First quarter · 45% |
| Thu, May 13 | 5:47 AM | 8:07 PM | 1:11 PM | 2:05 AM | Waxing gibbous · 56% |
| Fri, May 14 | 5:46 AM | 8:08 PM | 2:21 PM | 2:32 AM | Waxing gibbous · 67% |
| Sat, May 15 | 5:45 AM | 8:09 PM | 3:30 PM | 2:56 AM | Waxing gibbous · 77% |
| Sun, May 16 | 5:44 AM | 8:10 PM | 4:38 PM | 3:20 AM | Waxing gibbous · 85% |
| Mon, May 17 | 5:44 AM | 8:11 PM | 5:46 PM | 3:45 AM | Waxing gibbous · 92% |
| Tue, May 18 | 5:43 AM | 8:12 PM | 6:54 PM | 4:13 AM | Waxing gibbous · 97% |
| Wed, May 19 | 5:42 AM | 8:13 PM | 8:01 PM | 4:44 AM | Waxing gibbous · 99% |
| Thu, May 20 | 5:41 AM | 8:14 PM | 9:04 PM | 5:21 AM | Full moon · 100% |
| Fri, May 21 | 5:40 AM | 8:14 PM | 10:02 PM | 6:05 AM | Waning gibbous · 98% |
| Sat, May 22 | 5:40 AM | 8:15 PM | 10:53 PM | 6:56 AM | Waning gibbous · 95% |
| Sun, May 23 | 5:39 AM | 8:16 PM | 11:35 PM | 7:52 AM | Waning gibbous · 90% |
| Mon, May 24 | 5:38 AM | 8:17 PM | — | 8:52 AM | Waning gibbous · 83% |
| Tue, May 25 | 5:37 AM | 8:18 PM | 12:10 AM | 9:54 AM | Waning gibbous · 76% |
| Wed, May 26 | 5:37 AM | 8:19 PM | 12:39 AM | 10:55 AM | Waning gibbous · 67% |
| Thu, May 27 | 5:36 AM | 8:20 PM | 1:05 AM | 11:56 AM | Waning gibbous · 58% |
| Fri, May 28 | 5:36 AM | 8:20 PM | 1:28 AM | 12:57 PM | Last quarter · 49% |
| Sat, May 29 | 5:35 AM | 8:21 PM | 1:49 AM | 1:58 PM | Waning crescent · 39% |
| Sun, May 30 | 5:35 AM | 8:22 PM | 2:11 AM | 3:01 PM | Waning crescent · 29% |
| Mon, May 31 | 5:34 AM | 8:23 PM | 2:34 AM | 4:07 PM | Waning crescent · 20% |
Sky events this month
- Wed, May 5Eta Aquariids meteor shower peakUp to about 50 meteors an hour under a perfectly dark sky · the Moon stays out of the way
- Thu, May 20 4:59 AMFull moon
- Fri, May 28 4:01 AMMercury farthest from the Sun in the evening sky23° from the Sun: the best time to see it, low in the west after sunset
Month by month
Calculated with Astronomy Engine (MIT license).