Seongnam-Si in numbers
- Coordinates
- 37.4188, 127.1290
- Population
- 914 832
- Region
- Gyeonggi-do
- Country
- South Korea, Asia
- Capital
- Seoul — 21 km away
The Seongnam-Si clock reports the city’s current local time, with sunrise, sunset, and weather details for arranging calls, commutes, visits, and activities in Gyeonggi-do.
Seongnam-Si, South Korea
Monday, 9 November 2026
UTC+9 · Asia/Seoul
Local time in Seongnam-Si
UTC+9 · no daylight saving time
Sunrise 7:05 AM Solar noon 12:16 PM Sunset 5:28 PM Daylight 10 h 23 min Night 13 h 37 min Civil twilight 6:38 AM – 5:55 PM
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Weather data by Open-Meteo, updated every 30 minutes.
Postal codes come from the free GeoNames dataset. Where a code is listed with a distance, it belongs to a nearby settlement — GeoNames spells that name differently from ours.
Use the clock as the local reference for Seongnam-Si, South Korea. It is useful for remote work, family contact, reservation timing, and travel coordination. If you are elsewhere, compare the two locations directly instead of subtracting an offset remembered from a different date.
Calendar applications usually convert time automatically when a zone is assigned. Problems arise when an event is entered as a floating hour or when the device selects the wrong city. Naming Seongnam-Si in the invitation and confirming the local date keeps the arrangement understandable.
Identify the intended hour on the Seongnam-Si clock. Check its conversion for every other location involved. Confirm whether the date changes during conversion. Send a final reminder using the recipient’s local time. The easiest international meeting is the one whose calendar invite does the arithmetic.
Sunrise and sunset frame the period when the sun is above the horizon. They are valuable when planning a commute in daylight, an outdoor break, a hike, a photograph, or an evening return. Their exact times depend on the date, which makes the current listing preferable to a seasonal guess.
Twilight provides some light outside that interval. However, the amount of usable brightness depends on the sky and surroundings. Buildings and terrain may conceal the low sun, while heavy cloud can make daytime appear dimmer than the astronomical information suggests.
If an activity requires dependable light, schedule it away from the boundaries and leave a buffer for delays. Sunrise and sunset are precise reference events, but they do not describe pavement conditions, visibility in shaded areas, or whether the horizon is actually visible from your location.
Weather should be matched to the time of the activity rather than read as a single description for the whole day. Temperature may change between morning and evening. Wind, cloud, and precipitation can also develop or ease while the local clock advances.
Choose the forecast period closest to your departure. Review conditions again for the expected return time. Distinguish an observed reading from a forecast value. Check a fresh update if weather could disrupt transport or outdoor plans.
Reports for Seongnam-Si describe a wider area and may not mirror your immediate surroundings. Dense development, elevation, showers, and wind exposure can create noticeable local differences. Treat the display as a planning guide rather than an exact measurement for every address.
For a commute, combine departure time with the weather at both ends of the journey. For an outdoor event, compare the entire scheduled period with daylight and expected conditions. That simple habit gives a fuller answer than asking only whether it is currently warm, dry, or light.