July 21, 2026 · Seongnam-si, South Korea
Sunrise in Seongnam-si today is at 05:27. Day length is 14h 23m. See below for sunset, 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.
Sunrise shifts earlier through spring and later through autumn — changing fastest near the equinoxes and barely at all near the summer and winter solstices. See the year chart to visualise how sunrise and 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 | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 07:46 | 17:37 | 9h 51m |
| February | 07:22 | 18:11 | 10h 48m |
| March | 06:44 | 18:38 | 11h 54m |
| April | 05:58 | 19:06 | 13h 8m |
| May | 05:24 | 19:34 | 14h 10m |
| June | 05:11 | 19:54 | 14h 44m |
| July | 05:23 | 19:53 | 14h 31m |
| August | 05:48 | 19:26 | 13h 38m |
| September | 06:14 | 18:42 | 12h 28m |
| October | 06:39 | 17:57 | 11h 17m |
| November | 07:11 | 17:23 | 10h 11m |
| December | 07:39 | 17:15 | 9h 36m |