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Boulder, CO, USA — Sunrise, Sunset, and Moon Times for Today

Moon: 89.9%
Waning Gibbous
Current Time: Sep 10, 2025 at 6:05:24 am
Sunrise Today: 6:37 am↑ 83° East
Sunset Today: 7:17 pm↑ 277° West
Moonrise Today: 8:45 pm↑ 68° East
Moonset Today: 10:05 am↑ 288° West
Daylight Hours: 12 hours, 40 minutes (-2m 34s)
Location of Boulder Location

Today's Sun Position in Boulder

Time: 6:05 am
Altitude: -6.9°
Direction: 78° E
Phase: Nautical Twilight

Day length today: 12h 39m 37s (Sep 10, 2025)

2 minutes, 34 seconds shorter than yesterday (Sep 9, 2025)

3 hours, 20 minutes longer than winter solstice (Dec 21, 2024)

2 hours, 21 minutes shorter than summer solstice (Jun 20, 2025)

The Sun's altitude in Boulder today. The horizontal line signifies the horizon, the vertical lines show the times of sunrise and sunset. Altitude and heading are displayed below the graph. The graph defaults to current time. Hover over it to select a different time. How to use this

Night, Twilight, and Daylight Times in Boulder Today

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Day, night, and twilight times in Boulder today. Black is nighttime, light blue is daytime. The darker blue shadings represent the twilight phases during dawn (left) and dusk (right). Hover over the graph for more information. How to use this

Night 12:00 am – 5:04 am
Astro. Twilight 5:04 am – 5:38 am
Nautical Twilight 5:38 am – 6:10 am
Civil Twilight 6:10 am – 6:37 am
Daylight 6:37 am – 7:17 pm
Civil Twilight 7:17 pm – 7:44 pm
Nautical Twilight 7:44 pm – 8:16 pm
Astro. Twilight 8:16 pm – 8:50 pm
Night 8:50 pm – 11:59 pm

Sun in Boulder - Next 7 Days

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2025 Sunrise/Sunset Daylength Solar Noon
Sep Sunrise Sunset Length Diff. Time Mil. km
Sep 10 6:37 am 7:17 pm 12:39:37 −2:34 12:57 pm (54.6°) 150.616
Sep 11 6:38 am 7:15 pm 12:37:02 −2:34 12:57 pm (54.2°) 150.578
Sep 12 6:39 am 7:14 pm 12:34:27 −2:35 12:57 pm (53.9°) 150.539
Sep 13 6:40 am 7:12 pm 12:31:52 −2:35 12:56 pm (53.5°) 150.501
Sep 14 6:41 am 7:10 pm 12:29:16 −2:35 12:56 pm (53.1°) 150.462
Sep 15 6:42 am 7:09 pm 12:26:40 −2:35 12:56 pm (52.7°) 150.423
Sep 16 6:43 am 7:07 pm 12:24:04 −2:36 12:55 pm (52.3°) 150.384
* All times are local time for Boulder. Time is adjusted for DST when applicable. They take into account refraction. Dates are based on the Gregorian calendar.

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Equinoxes & Solstices 2025

March equinox Mar 20 3:01 am
June solstice Jun 20 8:42 pm
September equinox Sep 22 12:19 pm
December solstice Dec 21 8:03 am
* All times are local Boulder time.

Seasons Calculator for Boulder

Sun Articles

Today's Moon in Boulder

Percent Illuminated: 89.9%
Time: 6:05 am
Altitude: 42.2°
Direction: 247° W
Position: Waning Gibbous

The Moon's path in Boulder today. The horizontal line signifies the horizon, the vertical lines show times and headings of moonrise and moonset. The graph defaults to current time. Hover over it to select a different time. How to use this

Year 2025 Moon Phases

Moon in Boulder - Next 7 days

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2025 Moonrise/Moonset Meridian Passing
Sep Moonrise Moonset Moonrise Time Distance (km) Illumination
Sep 10 - 10:05 am 8:45 pm 3:04 am (61.4°) 364,785 90.7%
Sep 11 - 11:23 am 9:18 pm 3:57 am (67.8°) 365,268 82.4%
Sep 12 - 12:41 pm 9:58 pm 4:53 am (73.0°) 366,883 72.2%
Sep 13 - 1:56 pm 10:49 pm 5:53 am (76.6°) 369,374 60.8%
Sep 14 - 3:03 pm 11:49 pm 6:55 am (78.3°) 372,453 49.0%
Sep 15 - 3:59 pm - 7:57 am (78.0°) 375,882 37.4%
Sep 16 12:57 am 4:44 pm - 8:55 am (75.8°) 379,461 26.7%
* All times are local time for Boulder. Time is adjusted for DST when applicable. They take into account refraction. Dates are based on the Gregorian calendar. Illumination is calculated at lunar noon.

See full month's Moon

Moon Articles

Planets Visible in the Sky in Boulder This Coming Night

  Planetrise/Planetset, Wed, Sep 10, 2025
Planet Rise Set Meridian Comment
Mercury Wed 6:22 am Wed 7:18 pm Wed 12:51 pm Extremely difficult to see
Venus Wed 4:11 am Wed 6:06 pm Wed 11:09 am Fairly good visibility
Mars Wed 9:29 am Wed 8:36 pm Wed 3:03 pm Average visibility
Jupiter Wed 1:44 am Wed 4:27 pm Wed 9:05 am Fairly good visibility
Saturn Tue 7:50 pm Wed 7:37 am Wed 1:44 am Perfect visibility
Uranus Tue 10:25 pm Wed 12:53 pm Wed 5:39 am Average visibility
Neptune Tue 7:49 pm Wed 7:48 am Wed 1:48 am Slightly difficult to see
* All times are local time for Boulder.

More about the planets visible in the night sky in Boulder

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