July 21, 2026 · Seongnam-si, South Korea
Sunset in Seongnam-si today is at 19:50. Day length is 14h 23m. See below for sunrise, solar noon, dawn and dusk — all times calculated astronomically for Seongnam-si's coordinates and updated daily.
Seongnam-si 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 Seongnam-si.
The longest day in Seongnam-si is around 14h 45m (around June 21). The shortest is around 9h 35m (around December 21). Days are currently getting shorter — losing about 1 minute per day.
| Month | Sunset | Sunrise | Day length |
|---|---|---|---|
| January | 17:37 | 07:46 | 9h 51m |
| February | 18:11 | 07:22 | 10h 48m |
| March | 18:38 | 06:44 | 11h 54m |
| April | 19:06 | 05:58 | 13h 8m |
| May | 19:34 | 05:24 | 14h 10m |
| June | 19:54 | 05:11 | 14h 44m |
| July | 19:53 | 05:23 | 14h 31m |
| August | 19:26 | 05:48 | 13h 38m |
| September | 18:42 | 06:14 | 12h 28m |
| October | 17:57 | 06:39 | 11h 17m |
| November | 17:23 | 07:11 | 10h 11m |
| December | 17:15 | 07:39 | 9h 36m |