Sunrise and Sunset times in Boulder, United States 
Boulder
☁️ Low chance of a spectacular sunset.
Utah, United States
240 people
Current temperature 22 ° C 
Sunny
Today:
 Sunrise: 06:38:04
|
 Sunset: 20:23:38
|
Day Length: 13h 45m 34s
Time zone: America/Denver, UTC -6 h.
Latitude: 37.9228, Longitude: -111.432
| Date | Sunrise | Solar Noon | Sunset | Day length |
|---|---|---|---|---|
| 2025-Aug-01, Friday | 06:29:28 | 13:32:03 | 20:34:38 | 14h 5m 10s |
| 2025-Aug-02, Saturday | 06:30:19 | 13:31:58 | 20:33:38 | 14h 3m 19s |
| 2025-Aug-03, Sunday | 06:31:10 | 13:31:53 | 20:32:36 | 14h 1m 26s |
| 2025-Aug-04, Monday | 06:32:01 | 13:31:47 | 20:31:33 | 13h 59m 32s |
| 2025-Aug-05, Tuesday | 06:32:53 | 13:31:41 | 20:30:29 | 13h 57m 36s |
| 2025-Aug-06, Wednesday | 06:33:45 | 13:31:34 | 20:29:24 | 13h 55m 39s |
| 2025-Aug-07, Thursday | 06:34:37 | 13:31:27 | 20:28:17 | 13h 53m 40s |
| 2025-Aug-08, Friday | 06:35:28 | 13:31:19 | 20:27:09 | 13h 51m 41s |
| 2025-Aug-09, Saturday | 06:36:20 | 13:31:10 | 20:26:00 | 13h 49m 40s |
| 2025-Aug-10, Sunday | 06:37:12 | 13:31:01 | 20:24:49 | 13h 47m 37s |
| 2025-Aug-11, Monday | 06:38:04 | 13:30:51 | 20:23:38 | 13h 45m 34s |
| 2025-Aug-12, Tuesday | 06:38:57 | 13:30:41 | 20:22:25 | 13h 43m 28s |
| 2025-Aug-13, Wednesday | 06:39:49 | 13:30:30 | 20:21:11 | 13h 41m 22s |
| 2025-Aug-14, Thursday | 06:40:41 | 13:30:18 | 20:19:56 | 13h 39m 15s |
| 2025-Aug-15, Friday | 06:41:33 | 13:30:06 | 20:18:40 | 13h 37m 7s |
| 2025-Aug-16, Saturday | 06:42:25 | 13:29:54 | 20:17:23 | 13h 34m 58s |
| 2025-Aug-17, Sunday | 06:43:17 | 13:29:41 | 20:16:05 | 13h 32m 48s |
| 2025-Aug-18, Monday | 06:44:09 | 13:29:27 | 20:14:46 | 13h 30m 37s |
| 2025-Aug-19, Tuesday | 06:45:00 | 13:29:13 | 20:13:26 | 13h 28m 26s |
| 2025-Aug-20, Wednesday | 06:45:52 | 13:28:59 | 20:12:06 | 13h 26m 14s |
| 2025-Aug-21, Thursday | 06:46:44 | 13:28:44 | 20:10:44 | 13h 24m 0s |
| 2025-Aug-22, Friday | 06:47:36 | 13:28:29 | 20:09:21 | 13h 21m 45s |
| 2025-Aug-23, Saturday | 06:48:27 | 13:28:13 | 20:07:58 | 13h 19m 31s |
| 2025-Aug-24, Sunday | 06:49:19 | 13:27:56 | 20:06:34 | 13h 17m 15s |
| 2025-Aug-25, Monday | 06:50:10 | 13:27:40 | 20:05:09 | 13h 14m 59s |
| 2025-Aug-26, Tuesday | 06:51:02 | 13:27:23 | 20:03:44 | 13h 12m 42s |
| 2025-Aug-27, Wednesday | 06:51:53 | 13:27:05 | 20:02:17 | 13h 10m 24s |
| 2025-Aug-28, Thursday | 06:52:44 | 13:26:47 | 20:00:50 | 13h 8m 6s |
| 2025-Aug-29, Friday | 06:53:36 | 13:26:29 | 19:59:23 | 13h 5m 47s |
| 2025-Aug-30, Saturday | 06:54:27 | 13:26:11 | 19:57:55 | 13h 3m 28s |
| 2025-Aug-31, Sunday | 06:55:18 | 13:25:52 | 19:56:26 | 13h 1m 8s |
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