Sunrise and sunset in Boulder

Boulder Sunrise, Sunset and Moon in August 2026

Local time (MDT)

Day length goes from 14 h 48 min on August 1 to 13 h 21 min on August 31. Sunrise moves from 6:10 AM to 6:48 AM and sunset from 8:58 PM to 8:09 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
Aug 15:36 AM6:10 AM8:58 PM9:33 PM8:15 PM11:09 PM14 h 48 minWaning gibbous, 89%10:18 PM9:26 AM
Aug 25:37 AM6:12 AM8:57 PM9:32 PM8:14 PM11:06 PM14 h 45 min-3.0 minWaning gibbous, 81%10:34 PM10:36 AM
Aug 35:38 AM6:13 AM8:56 PM9:30 PM8:13 PM11:04 PM14 h 43 min-2.0 minWaning gibbous, 72%10:52 PM11:48 AM
Aug 45:40 AM6:14 AM8:54 PM9:28 PM8:12 PM11:02 PM14 h 40 min-3.0 minWaning gibbous, 63%11:13 PM1:03 PM
Aug 55:41 AM6:15 AM8:53 PM9:27 PM8:10 PM10:59 PM14 h 38 min-2.0 minLast quarter 8:21 PM11:39 PM2:21 PM
Aug 65:42 AM6:17 AM8:51 PM9:25 PM8:09 PM10:57 PM14 h 34 min-4.0 minLast quarter, 41%3:42 PM
Aug 75:44 AM6:18 AM8:50 PM9:24 PM8:08 PM10:55 PM14 h 32 min-2.0 minWaning crescent, 31%12:14 AM5:01 PM
Aug 85:45 AM6:19 AM8:48 PM9:22 PM8:06 PM10:52 PM14 h 29 min-3.0 minWaning crescent, 22%1:01 AM6:12 PM
Aug 95:47 AM6:20 AM8:47 PM9:20 PM8:05 PM10:50 PM14 h 27 min-2.0 minWaning crescent, 14%2:04 AM7:09 PM
Aug 105:48 AM6:21 AM8:45 PM9:19 PM8:03 PM10:47 PM14 h 24 min-3.0 minWaning crescent, 7%3:20 AM7:53 PM
Aug 115:49 AM6:23 AM8:44 PM9:17 PM8:02 PM10:45 PM14 h 21 min-3.0 minWaning crescent, 3%4:44 AM8:26 PM
Aug 125:51 AM6:24 AM8:42 PM9:15 PM8:00 PM10:43 PM14 h 18 min-3.0 minNew moon 11:37 AM6:09 AM8:51 PM
Aug 135:52 AM6:25 AM8:41 PM9:14 PM7:59 PM10:40 PM14 h 16 min-2.0 minNew moon, 0%7:31 AM9:12 PM
Aug 145:53 AM6:26 AM8:39 PM9:12 PM7:57 PM10:38 PM14 h 13 min-3.0 minWaxing crescent, 2%8:49 AM9:30 PM
Aug 155:55 AM6:28 AM8:37 PM9:10 PM7:56 PM10:35 PM14 h 09 min-4.0 minWaxing crescent, 7%10:04 AM9:47 PM
Aug 165:56 AM6:29 AM8:36 PM9:08 PM7:54 PM10:33 PM14 h 07 min-2.0 minWaxing crescent, 13%11:17 AM10:05 PM
Aug 175:58 AM6:30 AM8:34 PM9:06 PM7:53 PM10:31 PM14 h 04 min-3.0 minWaxing crescent, 21%12:29 PM10:25 PM
Aug 185:59 AM6:31 AM8:32 PM9:05 PM7:51 PM10:28 PM14 h 01 min-3.0 minWaxing crescent, 30%1:39 PM10:48 PM
Aug 196:00 AM6:33 AM8:30 PM9:03 PM7:49 PM10:26 PM13 h 57 min-4.0 minFirst quarter 8:46 PM2:48 PM11:16 PM
Aug 206:02 AM6:34 AM8:29 PM9:01 PM7:48 PM10:23 PM13 h 55 min-2.0 minFirst quarter, 50%3:54 PM11:52 PM
Aug 216:03 AM6:35 AM8:27 PM8:59 PM7:46 PM10:21 PM13 h 52 min-3.0 minWaxing gibbous, 61%4:54 PM
Aug 226:05 AM6:37 AM8:25 PM8:57 PM7:45 PM10:19 PM13 h 48 min-4.0 minWaxing gibbous, 71%5:45 PM12:38 AM
Aug 236:06 AM6:38 AM8:23 PM8:55 PM7:43 PM10:16 PM13 h 45 min-3.0 minWaxing gibbous, 80%6:27 PM1:32 AM
Aug 246:07 AM6:39 AM8:22 PM8:53 PM7:41 PM10:14 PM13 h 43 min-2.0 minWaxing gibbous, 88%7:00 PM2:35 AM
Aug 256:09 AM6:40 AM8:20 PM8:51 PM7:39 PM10:11 PM13 h 40 min-3.0 minWaxing gibbous, 94%7:27 PM3:43 AM
Aug 266:10 AM6:42 AM8:18 PM8:49 PM7:38 PM10:09 PM13 h 36 min-4.0 minWaxing gibbous, 98%7:49 PM4:53 AM
Aug 276:11 AM6:43 AM8:16 PM8:48 PM7:36 PM10:07 PM13 h 33 min-3.0 minFull moon 10:18 PM8:08 PM6:03 AM
Aug 286:13 AM6:44 AM8:14 PM8:46 PM7:34 PM10:04 PM13 h 30 min-3.0 minFull moon, 100%8:25 PM7:14 AM
Aug 296:14 AM6:45 AM8:12 PM8:44 PM7:32 PM10:02 PM13 h 27 min-3.0 minWaning gibbous, 97%8:42 PM8:25 AM
Aug 306:15 AM6:47 AM8:11 PM8:42 PM7:30 PM9:59 PM13 h 24 min-3.0 minWaning gibbous, 92%8:59 PM9:38 AM
Aug 316:17 AM6:48 AM8:09 PM8:40 PM7:29 PM9:57 PM13 h 21 min-3.0 minWaning gibbous, 86%9:19 PM10:53 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.