Sunrise and sunset in Boulder

Boulder Sunrise, Sunset and Moon in September 2026

Local time (MDT)

Day length goes from 13 h 18 min on September 1 to 11 h 44 min on September 30. Sunrise moves from 6:49 AM to 7:26 AM and sunset from 8:07 PM to 7:10 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 16:18 AM6:49 AM8:07 PM8:38 PM7:27 PM9:55 PM13 h 18 minWaning gibbous, 77%9:44 PM12:10 PM
Sep 26:19 AM6:50 AM8:05 PM8:36 PM7:25 PM9:52 PM13 h 15 min-3.0 minWaning gibbous, 68%10:15 PM1:30 PM
Sep 36:21 AM6:52 AM8:03 PM8:34 PM7:23 PM9:50 PM13 h 11 min-4.0 minLast quarter, 58%10:57 PM2:49 PM
Sep 46:22 AM6:53 AM8:01 PM8:32 PM7:21 PM9:48 PM13 h 08 min-3.0 minLast quarter 1:51 AM11:53 PM4:01 PM
Sep 56:23 AM6:54 AM7:59 PM8:30 PM7:19 PM9:45 PM13 h 05 min-3.0 minWaning crescent, 37%5:02 PM
Sep 66:25 AM6:55 AM7:57 PM8:28 PM7:17 PM9:43 PM13 h 02 min-3.0 minWaning crescent, 27%1:02 AM5:49 PM
Sep 76:26 AM6:57 AM7:55 PM8:26 PM7:16 PM9:41 PM12 h 58 min-4.0 minWaning crescent, 18%2:22 AM6:25 PM
Sep 86:27 AM6:58 AM7:53 PM8:24 PM7:14 PM9:38 PM12 h 55 min-3.0 minWaning crescent, 11%3:44 AM6:52 PM
Sep 96:29 AM6:59 AM7:51 PM8:22 PM7:12 PM9:36 PM12 h 52 min-3.0 minWaning crescent, 5%5:06 AM7:14 PM
Sep 106:30 AM7:00 AM7:49 PM8:20 PM7:10 PM9:34 PM12 h 49 min-3.0 minNew moon 9:27 PM6:25 AM7:33 PM
Sep 116:31 AM7:02 AM7:47 PM8:18 PM7:08 PM9:31 PM12 h 45 min-4.0 minNew moon, 0%7:41 AM7:51 PM
Sep 126:33 AM7:03 AM7:45 PM8:16 PM7:06 PM9:29 PM12 h 42 min-3.0 minNew moon, 1%8:55 AM8:09 PM
Sep 136:34 AM7:04 AM7:44 PM8:14 PM7:04 PM9:27 PM12 h 40 min-2.0 minWaxing crescent, 4%10:08 AM8:28 PM
Sep 146:35 AM7:06 AM7:42 PM8:12 PM7:02 PM9:25 PM12 h 36 min-4.0 minWaxing crescent, 9%11:20 AM8:50 PM
Sep 156:37 AM7:07 AM7:40 PM8:10 PM7:00 PM9:22 PM12 h 33 min-3.0 minWaxing crescent, 16%12:31 PM9:16 PM
Sep 166:38 AM7:08 AM7:38 PM8:08 PM6:58 PM9:20 PM12 h 30 min-3.0 minWaxing crescent, 25%1:40 PM9:49 PM
Sep 176:39 AM7:09 AM7:36 PM8:06 PM6:56 PM9:18 PM12 h 27 min-3.0 minWaxing crescent, 34%2:43 PM10:31 PM
Sep 186:40 AM7:11 AM7:34 PM8:04 PM6:54 PM9:16 PM12 h 23 min-4.0 minFirst quarter 2:43 PM3:38 PM11:22 PM
Sep 196:42 AM7:12 AM7:32 PM8:02 PM6:52 PM9:13 PM12 h 20 min-3.0 minFirst quarter, 55%4:23 PM
Sep 206:43 AM7:13 AM7:30 PM8:00 PM6:50 PM9:11 PM12 h 17 min-3.0 minWaxing gibbous, 66%5:00 PM12:21 AM
Sep 216:44 AM7:14 AM7:28 PM7:58 PM6:48 PM9:09 PM12 h 14 min-3.0 minWaxing gibbous, 75%5:29 PM1:27 AM
Sep 226:46 AM7:16 AM7:26 PM7:56 PM6:46 PM9:07 PM12 h 10 min-4.0 minWaxing gibbous, 84%5:52 PM2:36 AM
Sep 236:47 AM7:17 AM7:24 PM7:54 PM6:44 PM9:05 PM12 h 07 min-3.0 minWaxing gibbous, 91%6:12 PM3:46 AM
Sep 246:48 AM7:18 AM7:22 PM7:52 PM6:42 PM9:03 PM12 h 04 min-3.0 minWaxing gibbous, 96%6:30 PM4:57 AM
Sep 256:50 AM7:19 AM7:20 PM7:50 PM6:40 PM9:00 PM12 h 01 min-3.0 minFull moon, 99%6:47 PM6:08 AM
Sep 266:51 AM7:21 AM7:18 PM7:48 PM6:38 PM8:58 PM11 h 57 min-4.0 minFull moon 10:49 AM7:05 PM7:21 AM
Sep 276:52 AM7:22 AM7:16 PM7:46 PM6:36 PM8:56 PM11 h 54 min-3.0 minWaning gibbous, 99%7:25 PM8:37 AM
Sep 286:53 AM7:23 AM7:14 PM7:44 PM6:34 PM8:54 PM11 h 51 min-3.0 minWaning gibbous, 95%7:48 PM9:55 AM
Sep 296:55 AM7:25 AM7:12 PM7:42 PM6:32 PM8:52 PM11 h 47 min-4.0 minWaning gibbous, 89%8:17 PM11:16 AM
Sep 306:56 AM7:26 AM7:10 PM7:40 PM6:30 PM8:50 PM11 h 44 min-3.0 minWaning gibbous, 82%8:56 PM12:37 PM

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.