Year-round weather and climate in Seongnam-si, South Korea
Average temperatures in Seongnam-si run from an average low of -6°C21°F in January up to an average high of 30°C86°F in August. February is the driest month at 4 rainy days; July the wettest at 19. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 915K
- Currency
- KRW
- Language
- Korean
- Time zone
- Seoul
Best time to visit
The most pleasant weather falls in April, May, and June, offering a perfect balance of comfortable temperatures and clear skies.
Rain character
Tropical Downpours: Expect intense bursts of rain during wetter months. Pack quick-drying footwear and a compact umbrella.
Day-to-night swing
The Daypack Trap: Beware the "noon illusion". In months like March, crisp sunny days drop off a cliff by 12°C22°F at sunset. Always carry an evening layer.
Seasonality Profile
True Four Seasons: Dramatic contrasts. Freezing winters, transitional shoulders, and blazing summers.
Evening vibe
Cozy Indoor Culture: Evenings are generally crisp, damp, or sweltering. Nightlife centers around indoor venues.
Sightseeing stamina
All-Day Strolling: Weather is generally forgiving for long walking days. Comfortable sneakers are your most important packing item.
Average temperatures, sunshine, and rainfall
Average monthly weather in Seongnam-si, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. Feb is typically driest at 4 days (25mm); Jul the wettest at 19 days (364mm).
| Month | Average high | Average low | Sunshine hours | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | 2°C / 36°F | -6°C / 20°F | 7h | 5 | 23mm |
| Feb | 5°C / 41°F | -5°C / 24°F | 8h | 4 | 25mm |
| Mar | 12°C / 54°F | 1°C / 33°F | 9h | 7 | 34mm |
| Apr | 19°C / 65°F | 7°C / 44°F | 9h | 8 | 75mm |
| May | 22°C / 72°F | 12°C / 53°F | 9h | 8 | 123mm |
| Jun | 28°C / 82°F | 18°C / 64°F | 10h | 12 | 149mm |
| Jul | 30°C / 85°F | 23°C / 73°F | 8h | 19 | 364mm |
| Aug | 30°C / 87°F | 23°C / 73°F | 10h | 17 | 207mm |
| Sep | 27°C / 80°F | 19°C / 66°F | 8h | 13 | 230mm |
| Oct | 19°C / 66°F | 10°C / 51°F | 7h | 9 | 87mm |
| Nov | 11°C / 53°F | 2°C / 36°F | 8h | 5 | 78mm |
| Dec | 4°C / 38°F | -4°C / 24°F | 7h | 5 | 43mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit Seongnam-si?
The most sunshine in Seongnam-si comes around June, averaging 10 hours a month. If you're heading there then, pack your sunglasses and sunscreen.
What clothes should I pack for Seongnam-si?
Your packing list depends entirely on when you travel. Temperatures in Seongnam-si swing from an average low of -6°C21°F in January up to 30°C86°F in August. The Packola app builds a tailored packing list for you based on the live weather forecast for your exact travel dates.
Do I need to pack an umbrella for Seongnam-si?
Seongnam-si gets rain on about 112 days out of the year. The wettest month is July. If you're traveling during the rainy season, you'll definitely want to pack an umbrella and a light rain jacket.
Pack smarter.
Averages get you close, but the week you travel is what matters. Get the live forecast, a smart packing list, and discover the best local spots and activities in Seongnam-si with Packola.
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