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

Moon: 93.9%
Waxing Gibbous
Current Time: Sep 18, 2021 at 10:14:02 am
Sunrise Today: 6:45 am 87° East
Sunset Today: 7:04 pm 273° West
Moonrise Today: 6:27 pm 110° Southeast
Moonset Today: 3:59 am 246° West
Daylight Hours: 12 hours, 19 minutes (-2m 36s)
Location of BoulderLocation

Today's Sun Position in Boulder

Time:10:14 am
Altitude:37.0°
Direction:126° SE
Phase:Daylight

Day length today: 12h 18m 58s (Sep 18, 2021)

2 minutes, 36 seconds shorter than yesterday (Sep 17, 2021)

2 hours, 59 minutes longer than winter solstice (Dec 21, 2020)

2 hours, 42 minutes shorter than summer solstice (Jun 20, 2021)

Night, Twilight, and Daylight Times in Boulder Today

12 am
2 am
4 am
6 am
8 am
10 am
12 pm
2 pm
4 pm
6 pm
8 pm
10 pm
Night12:00 am – 5:13 am
Astro. Twilight5:13 am – 5:46 am
Nautical Twilight5:46 am – 6:18 am
Civil Twilight6:18 am – 6:45 am
Daylight6:45 am – 7:04 pm
Civil Twilight7:04 pm – 7:31 pm
Nautical Twilight7:31 pm – 8:02 pm
Astro. Twilight8:02 pm – 8:35 pm
Night8:35 pm – 11:59 pm

Sun in Boulder - Next 7 Days

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2021Sunrise/SunsetDaylengthSolar Noon
SepSunriseSunsetLengthDiff.TimeMil. mi
Sep 186:45 am7:04 pm12:18:58−2:3612:55 pm (51.6°)93.389
Sep 196:46 am7:02 pm12:16:21−2:3612:54 pm (51.2°)93.364
Sep 206:47 am7:00 pm12:13:45−2:3612:54 pm (50.8°)93.338
Sep 216:48 am6:59 pm12:11:08−2:3612:53 pm (50.4°)93.312
Sep 226:49 am6:57 pm12:08:32−2:3612:53 pm (50.0°)93.286
Sep 236:49 am6:55 pm12:05:55−2:3612:53 pm (49.6°)93.261
Sep 246:50 am6:54 pm12:03:18−2:3612:52 pm (49.2°)93.235
* 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.

September Equinox (Autumnal Equinox) is on Wednesday, September 22, 2021 at 1:21 pm in Boulder.
Why is the day and night not exactly 12 hours on Equinox?

See full month's Sun


Today's Moon in Boulder

Year 2021 Moon Phases

Moon in Boulder - Next 7 days

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2021Moonrise/MoonsetMeridian Passing
SepMoonriseMoonsetMoonriseTimeDistance (mi)Illumination
Sep 18-3:59 am6:27 pm11:43 pm(34.9°)238,46196.4%
Sep 19-5:07 am6:55 pmMoon does not pass the meridian on this day.
Sep 20-6:14 am7:20 pm12:30 am(40.4°)240,69499.2%
Sep 21-7:18 am7:43 pm1:14 am(46.1°)243,02199.8%
Sep 22-8:20 am8:06 pm1:57 am(51.9°)245,33198.0%
Sep 23-9:22 am8:30 pm2:39 am(57.5°)247,48294.3%
Sep 24-10:23 am8:56 pm3:22 am(62.7°)249,31188.9%
* 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

Planets Visible in the Sky in Boulder This Coming Night

 Planetrise/Planetset, Sat, Sep 18, 2021
PlanetRiseSetMeridianComment
MercurySat 9:02 amSat 7:49 pmSat 2:26 pmDifficult to see
VenusSat 10:26 amSat 8:42 pmSat 3:34 pmGood visibility
MarsSat 7:17 amSat 7:21 pmSat 1:19 pmExtremely difficult to see
JupiterSat 5:42 pmSun 4:04 amSat 10:53 pmPerfect visibility
SaturnSat 4:53 pmSun 2:41 amSat 9:47 pmPerfect visibility
UranusFri 9:02 pmSat 10:56 amSat 3:59 amAverage visibility
NeptuneSat 6:51 pmSun 6:25 amSun 12:38 amSlightly difficult to see
* All times are local time for Boulder.

More about the planets visible in the night sky in Boulder