July 21, 2026 · Osan, South Korea
Sunset in Osan today is at 19:49. Day length is 14h 21m. See below for sunrise, solar noon, dawn and dusk — all times calculated astronomically for Osan's coordinates and updated daily.
Osan lies at 37°N. At this latitude, day length varies moderately — from around 10 hours in midwinter to 14–15 hours in midsummer.
Sunset shifts later through spring and earlier through autumn — changing fastest near the equinoxes and slowest near the summer and winter solstices. See the year chart to visualise how sunset times shift month by month for Osan.
The longest day in Osan is around 14h 43m (around June 21). The shortest is around 9h 36m (around December 21). Days are currently getting shorter — losing about 1 minute per day.
| Month | Sunset | Sunrise | Day length |
|---|---|---|---|
| January | 17:38 | 07:45 | 9h 53m |
| February | 18:11 | 07:22 | 10h 49m |
| March | 18:39 | 06:45 | 11h 54m |
| April | 19:06 | 05:59 | 13h 7m |
| May | 19:33 | 05:25 | 14h 8m |
| June | 19:54 | 05:12 | 14h 42m |
| July | 19:53 | 05:24 | 14h 29m |
| August | 19:26 | 05:49 | 13h 37m |
| September | 18:42 | 06:14 | 12h 28m |
| October | 17:57 | 06:39 | 11h 18m |
| November | 17:23 | 07:11 | 10h 13m |
| December | 17:16 | 07:39 | 9h 38m |