Daily sunrise, sunset, and daylight duration for Boulder throughout September 2021. Plan photography, golden hour, and travel with accurate day-by-day sun data.
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| Mi., 1. Sept. | 6:49 | 20:06 | 13h 17m |
| Do., 2. Sept. | 6:50 | 20:04 | 13h 14m |
| Fr., 3. Sept. | 6:51 | 20:02 | 13h 11m |
| Sa., 4. Sept. | 6:53 | 20:00 | 13h 07m |
| So., 5. Sept. | 6:54 | 19:58 | 13h 04m |
| Mo., 6. Sept. | 6:55 | 19:56 | 13h 01m |
| Di., 7. Sept. | 6:56 | 19:54 | 12h 58m |
| Mi., 8. Sept. | 6:58 | 19:52 | 12h 55m |
| Do., 9. Sept. | 6:59 | 19:50 | 12h 52m |
| Fr., 10. Sept. | 7:00 | 19:48 | 12h 48m |
| Sa., 11. Sept. | 7:01 | 19:47 | 12h 45m |
| So., 12. Sept. | 7:03 | 19:45 | 12h 42m |
| Mo., 13. Sept. | 7:04 | 19:43 | 12h 39m |
| Di., 14. Sept. | 7:05 | 19:41 | 12h 35m |
| Mi., 15. Sept. | 7:06 | 19:39 | 12h 32m |
| Do., 16. Sept. | 7:08 | 19:37 | 12h 29m |
| Fr., 17. Sept. | 7:09 | 19:35 | 12h 26m |
| Sa., 18. Sept. | 7:10 | 19:33 | 12h 22m |
| So., 19. Sept. | 7:12 | 19:31 | 12h 19m |
| Mo., 20. Sept. | 7:13 | 19:29 | 12h 16m |
| Di., 21. Sept. | 7:14 | 19:27 | 12h 13m |
| Mi., 22. Sept. | 7:15 | 19:25 | 12h 09m |
| Do., 23. Sept. | 7:17 | 19:23 | 12h 06m |
| Fr., 24. Sept. | 7:18 | 19:21 | 12h 03m |
| Sa., 25. Sept. | 7:19 | 19:19 | 12h 00m |
| So., 26. Sept. | 7:20 | 19:17 | 11h 56m |
| Mo., 27. Sept. | 7:22 | 19:15 | 11h 53m |
| Di., 28. Sept. | 7:23 | 19:13 | 11h 50m |
| Mi., 29. Sept. | 7:24 | 19:11 | 11h 47m |
| Do., 30. Sept. | 7:26 | 19:09 | 11h 43m |
Daily sunrise, sunset, and daylight duration for Boulder in the selected month.
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