Sunrise and Sunset times in Boulder, United States 
Boulder
☁️ Low chance of a spectacular sunset.
Wyoming, United States
Current temperature 16 ° C 
Mist
Today:
 Sunrise: 06:21:37
|
 Sunset: 20:26:17
|
Day Length: 14h 4m 40s
Time zone: America/Denver, UTC -6 h.
Latitude: 42.7462, Longitude: -109.707
| Date | Sunrise | Solar Noon | Sunset | Day length |
|---|---|---|---|---|
| 2025-Aug-01, Friday | 06:11:02 | 13:25:09 | 20:39:15 | 14h 28m 13s |
| 2025-Aug-02, Saturday | 06:12:05 | 13:25:04 | 20:38:04 | 14h 25m 59s |
| 2025-Aug-03, Sunday | 06:13:07 | 13:24:59 | 20:36:51 | 14h 23m 44s |
| 2025-Aug-04, Monday | 06:14:10 | 13:24:53 | 20:35:37 | 14h 21m 27s |
| 2025-Aug-05, Tuesday | 06:15:14 | 13:24:47 | 20:34:21 | 14h 19m 7s |
| 2025-Aug-06, Wednesday | 06:16:17 | 13:24:40 | 20:33:03 | 14h 16m 46s |
| 2025-Aug-07, Thursday | 06:17:21 | 13:24:33 | 20:31:45 | 14h 14m 24s |
| 2025-Aug-08, Friday | 06:18:25 | 13:24:25 | 20:30:25 | 14h 12m 0s |
| 2025-Aug-09, Saturday | 06:19:29 | 13:24:16 | 20:29:03 | 14h 9m 34s |
| 2025-Aug-10, Sunday | 06:20:33 | 13:24:07 | 20:27:41 | 14h 7m 8s |
| 2025-Aug-11, Monday | 06:21:37 | 13:23:57 | 20:26:17 | 14h 4m 40s |
| 2025-Aug-12, Tuesday | 06:22:42 | 13:23:47 | 20:24:52 | 14h 2m 10s |
| 2025-Aug-13, Wednesday | 06:23:46 | 13:23:36 | 20:23:26 | 13h 59m 40s |
| 2025-Aug-14, Thursday | 06:24:51 | 13:23:24 | 20:21:58 | 13h 57m 7s |
| 2025-Aug-15, Friday | 06:25:55 | 13:23:12 | 20:20:30 | 13h 54m 35s |
| 2025-Aug-16, Saturday | 06:27:00 | 13:23:00 | 20:19:00 | 13h 52m 0s |
| 2025-Aug-17, Sunday | 06:28:05 | 13:22:47 | 20:17:29 | 13h 49m 24s |
| 2025-Aug-18, Monday | 06:29:09 | 13:22:33 | 20:15:57 | 13h 46m 48s |
| 2025-Aug-19, Tuesday | 06:30:14 | 13:22:19 | 20:14:25 | 13h 44m 11s |
| 2025-Aug-20, Wednesday | 06:31:19 | 13:22:05 | 20:12:51 | 13h 41m 32s |
| 2025-Aug-21, Thursday | 06:32:24 | 13:21:50 | 20:11:17 | 13h 38m 53s |
| 2025-Aug-22, Friday | 06:33:28 | 13:21:35 | 20:09:41 | 13h 36m 13s |
| 2025-Aug-23, Saturday | 06:34:33 | 13:21:19 | 20:08:05 | 13h 33m 32s |
| 2025-Aug-24, Sunday | 06:35:37 | 13:21:03 | 20:06:28 | 13h 30m 51s |
| 2025-Aug-25, Monday | 06:36:42 | 13:20:46 | 20:04:50 | 13h 28m 8s |
| 2025-Aug-26, Tuesday | 06:37:47 | 13:20:29 | 20:03:11 | 13h 25m 24s |
| 2025-Aug-27, Wednesday | 06:38:51 | 13:20:11 | 20:01:32 | 13h 22m 41s |
| 2025-Aug-28, Thursday | 06:39:56 | 13:19:54 | 19:59:52 | 13h 19m 56s |
| 2025-Aug-29, Friday | 06:41:00 | 13:19:35 | 19:58:11 | 13h 17m 11s |
| 2025-Aug-30, Saturday | 06:42:04 | 13:19:17 | 19:56:29 | 13h 14m 25s |
| 2025-Aug-31, Sunday | 06:43:09 | 13:18:58 | 19:54:47 | 13h 11m 38s |
Day length in Boulder during the year on the chart:
Boulder on United States map:
Locations in the same time zone America/Denver
Denver (Colorado), Salt Lake City (Utah), El Paso (Texas), Albuquerque (New Mexico), Colorado Springs (Colorado), Ogden (Utah), Provo (Utah), Aurora (Colorado), Fort Collins (Colorado), Lakewood (Colorado), Pueblo (Colorado), Thornton (Colorado), Grand Junction (Colorado), West Valley City (Utah), Las Cruces (New Mexico), Greeley (Colorado), Billings (Montana), Arvada (Colorado), St. George (Utah), West Jordan (Utah), Westminster (Colorado), Centennial (Colorado), Santa Fe (New Mexico), Highlands Ranch (Colorado), Logan (Utah), Longmont (Colorado), Orem (Utah), Rio Rancho (New Mexico), Sandy (Utah), Lafayette (Colorado)
Largest Populated Areas in United States
New York (New York), Los Angeles (California), Chicago (Illinois), Miami (Florida), Dallas (Texas), Philadelphia (Pennsylvania), Houston (Texas), Washington (District of Columbia), Atlanta (Georgia), Boston (Massachusetts), Phoenix (Arizona), Seattle (Washington), San Francisco (California), Detroit (Michigan), San Diego (California), Minneapolis (Minnesota), Tampa (Florida), Denver (Colorado), Brooklyn (New York), Queens (New York), Baltimore (Maryland), Riverside (California), St. Louis (Missouri), Las Vegas (Nevada), Portland (Oregon), San Antonio (Texas), Sacramento (California), San Jose (California), Orlando (Florida), Cleveland (Ohio)
Daylight Hours FAQ: 10 Most Googled Questions Answered
Daylight hours refer to the period between sunrise and sunset. This duration changes throughout the year based on season and geographic location.
Earth's 23.5° axial tilt causes uneven sunlight distribution. Your hemisphere receives less direct sunlight in winter (shorter days) and more in summer (longer days).
Northern Hemisphere: June 20-22 (summer solstice).
Southern Hemisphere: December 21-23.
Near polar circles, the sun doesn't set for 24 hours.
Northern Hemisphere: December 21-22 (winter solstice).
Southern Hemisphere: June 20-21.
The closer to poles, the more extreme variations:
- Equator: ~12-hour days year-round
- Polar regions: Midnight sun/polar nights occur
Miami's lower latitude means:
- Winter days are longer than NY's
- Summer days are slightly shorter
During equinoxes:
- Spring: March 20-21
- Fall: September 22-23
Most rapid change near equinoxes: 2-4 minutes daily.
Slowest change near solstices: <1 minute daily.
Reliable tools:
- Timeanddate.com
- SunCalc.org
- Photographer's Ephemeris app
Yes. Reduced winter sunlight may cause:
- Seasonal Affective Disorder (SAD)
- Vitamin D deficiency
Solution: Light therapy lamps & midday walks