Sunrise and sunset in Boulder, United States, September 2027
Sunset in September
6:45–7:33 pm
Sunrise 6:29–6:56 am. 11 h 49 min to 13 h 4 min of daylight.
Latest sunset 7:33 pm, Sep 1Earliest sunrise 6:29 am, Sep 1Longest day 13 h 4 min, Sep 1Over the month 1 h 15 min less daylight
September in Boulder, day by day
Each day’s sky from midnight to midnight
- Wed 1Sunrise 6:29 amSunset 7:33 pm13 h 4 min
- Thu 2Sunrise 6:29 amSunset 7:31 pm13 h 2 min
- Fri 3Sunrise 6:30 amSunset 7:30 pm12 h 59 min
- Sat 4Sunrise 6:31 amSunset 7:28 pm12 h 57 min
- Sun 5Sunrise 6:32 amSunset 7:26 pm12 h 54 min
- Mon 6Sunrise 6:33 amSunset 7:25 pm12 h 51 min
- Tue 7Sunrise 6:34 amSunset 7:23 pm12 h 49 min
- Wed 8Sunrise 6:35 amSunset 7:21 pm12 h 46 min
- Thu 9Sunrise 6:36 amSunset 7:20 pm12 h 44 min
- Fri 10Sunrise 6:37 amSunset 7:18 pm12 h 41 min
- Sat 11Sunrise 6:38 amSunset 7:17 pm12 h 39 min
- Sun 12Sunrise 6:39 amSunset 7:15 pm12 h 36 min
- Mon 13Sunrise 6:40 amSunset 7:13 pm12 h 33 min
- Tue 14Sunrise 6:41 amSunset 7:12 pm12 h 31 min
- Wed 15Sunrise 6:42 amSunset 7:10 pm12 h 28 min
- Thu 16Sunrise 6:43 amSunset 7:08 pm12 h 26 min
- Fri 17Sunrise 6:44 amSunset 7:07 pm12 h 23 min
- Sat 18Sunrise 6:45 amSunset 7:05 pm12 h 20 min
- Sun 19Sunrise 6:46 amSunset 7:03 pm12 h 18 min
- Mon 20Sunrise 6:46 amSunset 7:02 pm12 h 15 min
- Tue 21Sunrise 6:47 amSunset 7:00 pm12 h 13 min
- Wed 22Sunrise 6:48 amSunset 6:58 pm12 h 10 min
- Thu 23Sunrise 6:49 amSunset 6:57 pm12 h 7 min
- Fri 24Sunrise 6:50 amSunset 6:55 pm12 h 5 min
- Sat 25Sunrise 6:51 amSunset 6:53 pm12 h 2 min
- Sun 26Sunrise 6:52 amSunset 6:52 pm11 h 59 min
- Mon 27Sunrise 6:53 amSunset 6:50 pm11 h 57 min
- Tue 28Sunrise 6:54 amSunset 6:48 pm11 h 54 min
- Wed 29Sunrise 6:55 amSunset 6:47 pm11 h 52 min
- Thu 30Sunrise 6:56 amSunset 6:45 pm11 h 49 min
Dawn, dusk and golden hour in Boulder, September 2027
| Date | First light | Golden hour | Dark by | Solar noon |
|---|---|---|---|---|
| Wed 1 | 6:01 am | 6:57 pm | 8:00 pm | 1:01 pm |
| Thu 2 | 6:02 am | 6:55 pm | 7:59 pm | 1:01 pm |
| Fri 3 | 6:03 am | 6:54 pm | 7:57 pm | 1:00 pm |
| Sat 4 | 6:04 am | 6:52 pm | 7:56 pm | 1:00 pm |
| Sun 5 | 6:05 am | 6:50 pm | 7:54 pm | 1:00 pm |
| Mon 6 | 6:06 am | 6:49 pm | 7:52 pm | 12:59 pm |
| Tue 7 | 6:07 am | 6:47 pm | 7:51 pm | 12:59 pm |
| Wed 8 | 6:08 am | 6:46 pm | 7:49 pm | 12:59 pm |
| Thu 9 | 6:09 am | 6:44 pm | 7:47 pm | 12:58 pm |
| Fri 10 | 6:10 am | 6:42 pm | 7:45 pm | 12:58 pm |
| Sat 11 | 6:11 am | 6:41 pm | 7:44 pm | 12:58 pm |
| Sun 12 | 6:12 am | 6:39 pm | 7:42 pm | 12:57 pm |
| Mon 13 | 6:13 am | 6:38 pm | 7:40 pm | 12:57 pm |
| Tue 14 | 6:14 am | 6:36 pm | 7:39 pm | 12:57 pm |
| Wed 15 | 6:15 am | 6:34 pm | 7:37 pm | 12:56 pm |
| Thu 16 | 6:15 am | 6:33 pm | 7:35 pm | 12:56 pm |
| Fri 17 | 6:16 am | 6:31 pm | 7:34 pm | 12:55 pm |
| Sat 18 | 6:17 am | 6:29 pm | 7:32 pm | 12:55 pm |
| Sun 19 | 6:18 am | 6:28 pm | 7:30 pm | 12:55 pm |
| Mon 20 | 6:19 am | 6:26 pm | 7:29 pm | 12:54 pm |
| Tue 21 | 6:20 am | 6:24 pm | 7:27 pm | 12:54 pm |
| Wed 22 | 6:21 am | 6:23 pm | 7:25 pm | 12:54 pm |
| Thu 23 | 6:22 am | 6:21 pm | 7:24 pm | 12:53 pm |
| Fri 24 | 6:23 am | 6:19 pm | 7:22 pm | 12:53 pm |
| Sat 25 | 6:24 am | 6:18 pm | 7:20 pm | 12:53 pm |
| Sun 26 | 6:25 am | 6:16 pm | 7:19 pm | 12:52 pm |
| Mon 27 | 6:26 am | 6:14 pm | 7:17 pm | 12:52 pm |
| Tue 28 | 6:27 am | 6:13 pm | 7:15 pm | 12:52 pm |
| Wed 29 | 6:28 am | 6:11 pm | 7:14 pm | 12:51 pm |
| Thu 30 | 6:29 am | 6:09 pm | 7:12 pm | 12:51 pm |
First light and dark by are civil twilight: the sun 6° below the horizon. Golden hour is when the evening’s starts, with the sun 6° above the horizon.
Questions
What time is sunset in Boulder in September?
Between 6:45 pm (Sep 30) and 7:33 pm (Sep 1) in 2027.
What time is sunrise in Boulder in September?
Between 6:29 am (Sep 1) and 6:56 am (Sep 30) in 2027.
When does it get dark in Boulder in September?
It’s dark enough for streetlights by 7:12–8 pm, about half an hour after sunset.
How many hours of daylight does Boulder get in September?
From 11 h 49 min on Sep 30 to 13 h 4 min on Sep 1. The days get shorter by 1 h 15 min from the first of the month to the last.
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