Sunrise and sunset in Boulder

Boulder Sunrise, Sunset and Moon in September 2026

Local time (MDT)

Day length goes from 13 h 03 min on September 1 to 11 h 48 min on September 30. Sunrise moves from 6:29 AM to 6:57 AM and sunset from 7:32 PM to 6:45 PM.

Every day

Dawn and dusk are civil twilight (the sun 6 degrees below the horizon); golden hour starts when the evening sun is 6 degrees up; full dark is astronomical twilight, 18 degrees down. A blank moonrise or moonset means it falls on the next day.

DateDawnSunriseSunsetDuskGolden hourFull darkDay lengthChangeMoonMoonriseMoonset
Sep 16:01 AM6:29 AM7:32 PM8:00 PM6:56 PM9:07 PM13 h 03 minWaning gibbous, 77%9:34 PM11:25 AM
Sep 26:02 AM6:30 AM7:31 PM7:58 PM6:55 PM9:06 PM13 h 01 min-2.0 minWaning gibbous, 68%10:11 PM12:39 PM
Sep 36:03 AM6:31 AM7:29 PM7:57 PM6:53 PM9:04 PM12 h 58 min-3.0 minLast quarter, 58%10:57 PM1:53 PM
Sep 46:04 AM6:32 AM7:28 PM7:55 PM6:52 PM9:02 PM12 h 56 min-2.0 minLast quarter 1:51 AM11:54 PM3:03 PM
Sep 56:05 AM6:33 AM7:26 PM7:53 PM6:50 PM9:00 PM12 h 53 min-3.0 minWaning crescent, 37%4:04 PM
Sep 66:06 AM6:34 AM7:24 PM7:52 PM6:48 PM8:58 PM12 h 50 min-3.0 minWaning crescent, 27%1:02 AM4:56 PM
Sep 76:07 AM6:35 AM7:23 PM7:50 PM6:47 PM8:56 PM12 h 48 min-2.0 minWaning crescent, 18%2:17 AM5:37 PM
Sep 86:08 AM6:36 AM7:21 PM7:48 PM6:45 PM8:54 PM12 h 45 min-3.0 minWaning crescent, 11%3:34 AM6:10 PM
Sep 96:09 AM6:37 AM7:19 PM7:47 PM6:44 PM8:52 PM12 h 42 min-3.0 minWaning crescent, 5%4:50 AM6:38 PM
Sep 106:10 AM6:37 AM7:18 PM7:45 PM6:42 PM8:51 PM12 h 41 min-1.0 minNew moon 9:27 PM6:02 AM7:03 PM
Sep 116:11 AM6:38 AM7:16 PM7:43 PM6:40 PM8:49 PM12 h 38 min-3.0 minNew moon, 0%7:13 AM7:26 PM
Sep 126:12 AM6:39 AM7:15 PM7:42 PM6:39 PM8:47 PM12 h 36 min-2.0 minNew moon, 1%8:21 AM7:49 PM
Sep 136:13 AM6:40 AM7:13 PM7:40 PM6:37 PM8:45 PM12 h 33 min-3.0 minWaxing crescent, 4%9:28 AM8:13 PM
Sep 146:14 AM6:41 AM7:11 PM7:38 PM6:36 PM8:43 PM12 h 30 min-3.0 minWaxing crescent, 9%10:35 AM8:40 PM
Sep 156:15 AM6:42 AM7:10 PM7:37 PM6:34 PM8:41 PM12 h 28 min-2.0 minWaxing crescent, 16%11:41 AM9:11 PM
Sep 166:16 AM6:43 AM7:08 PM7:35 PM6:32 PM8:39 PM12 h 25 min-3.0 minWaxing crescent, 25%12:45 PM9:48 PM
Sep 176:17 AM6:44 AM7:06 PM7:33 PM6:31 PM8:38 PM12 h 22 min-3.0 minWaxing crescent, 34%1:45 PM10:32 PM
Sep 186:18 AM6:45 AM7:05 PM7:32 PM6:29 PM8:36 PM12 h 20 min-2.0 minFirst quarter 2:43 PM2:39 PM11:23 PM
Sep 196:19 AM6:46 AM7:03 PM7:30 PM6:27 PM8:34 PM12 h 17 min-3.0 minFirst quarter, 55%3:27 PM
Sep 206:20 AM6:47 AM7:01 PM7:28 PM6:26 PM8:32 PM12 h 14 min-3.0 minWaxing gibbous, 66%4:07 PM12:21 AM
Sep 216:21 AM6:48 AM7:00 PM7:27 PM6:24 PM8:30 PM12 h 12 min-2.0 minWaxing gibbous, 75%4:40 PM1:22 AM
Sep 226:22 AM6:49 AM6:58 PM7:25 PM6:22 PM8:29 PM12 h 09 min-3.0 minWaxing gibbous, 84%5:09 PM2:26 AM
Sep 236:23 AM6:50 AM6:56 PM7:23 PM6:21 PM8:27 PM12 h 06 min-3.0 minWaxing gibbous, 91%5:34 PM3:31 AM
Sep 246:24 AM6:51 AM6:55 PM7:22 PM6:19 PM8:25 PM12 h 04 min-2.0 minWaxing gibbous, 96%5:57 PM4:37 AM
Sep 256:25 AM6:52 AM6:53 PM7:20 PM6:17 PM8:23 PM12 h 01 min-3.0 minFull moon, 99%6:19 PM5:43 AM
Sep 266:26 AM6:53 AM6:51 PM7:18 PM6:16 PM8:22 PM11 h 58 min-3.0 minFull moon 10:49 AM6:42 PM6:50 AM
Sep 276:27 AM6:54 AM6:50 PM7:17 PM6:14 PM8:20 PM11 h 56 min-2.0 minWaning gibbous, 99%7:07 PM7:59 AM
Sep 286:28 AM6:55 AM6:48 PM7:15 PM6:12 PM8:18 PM11 h 53 min-3.0 minWaning gibbous, 95%7:36 PM9:12 AM
Sep 296:29 AM6:56 AM6:46 PM7:13 PM6:11 PM8:16 PM11 h 50 min-3.0 minWaning gibbous, 89%8:11 PM10:27 AM
Sep 306:30 AM6:57 AM6:45 PM7:12 PM6:09 PM8:15 PM11 h 48 min-2.0 minWaning gibbous, 82%8:55 PM11:42 AM

Other months

More

Sources

Computed with the NOAA solar position equations and the lunar methods of Meeus, Astronomical Algorithms, for a flat horizon; hills and buildings delay a real sunrise.