Seoul, South Korea Weather
Seoul hourly forecast: next 24 hours
Today's high of 82°F (28°C) is about 4°F (2°C) above the typical September high of 78°F (25°C).
Current conditions in detail
Seoul weather tomorrow (Thursday, September 17)
Tomorrow in Seoul looks overcast, with a high of 80° and an overnight low of 64°. Rain is unlikely (9% chance). Winds top out near 7 mph, and the UV index reaches 6 (moderate).
Seoul 14-day forecast
About the weather in Seoul
Seoul spends most of the year cold. August, the warmest month, averages 85°F (29°C) by day - a figure many cities in our dataset pass in early spring - while January holds at 36°F (2°C) with 98 wet days a year across the whole calendar.
Seoul weather: quick facts
- Hottest month: August - highs near 85°F (29°C)
- Coldest month: January - highs near 36°F (2°C)
- Decade extremes (2015-2024): 97°F (36°C) high · -3°F (-20°C) low
- Wettest month: July (18 rainy days) · Sunniest: May (10.0 h sun/day)
- Climate type: humid subtropical
- Annual swing: 28°C between the average warmest and coolest month · day to night: 9°C
- Snow: about 5 days a year
- Months with freezing average lows: 4
- Average humidity: 70%
Temperatures through the year
January bottoms out at 36°F (2°C) in daylight, 20°F (-7°C) after dark. August is the warm end of the year, averaging 85°F (29°C) by day and 72°F (22°C) overnight. Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is May through June.
Rain, sun and snow
The wettest month is July (12.2 inches (310 mm) across 18 days) and the driest January. Snow falls on roughly 5 days a year, mostly December through March. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 97°F (36°C) and the lowest daily minimum -3°F (-20°C).
Season by season
Spring (March through May)
Spring stays on the cool side of mild here - highs near 63°F (17°C), nights near 43°F (6°C), and expect showers on roughly 21 days across the season.
Summer (June through August)
Through summer, Seoul sits firmly in the heat: 83°F (28°C) by day, 69°F (21°C) after dark, and rain falls on around 43 of the 90 days. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
Fall (September through November)
Fall is crisp but comfortable here - highs near 65°F (18°C), nights near 49°F (9°C), and expect showers on roughly 22 days across the season.
Winter (December through February)
Winter runs to hard cold here - highs near 38°F (3°C), nights near 22°F (-6°C), and rain comes on about 12 days over the three months, plus about 4 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Average temperatures in Seoul by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 36° | 20° | 3 | 0.7 in | 7.8 h/day | 58% |
| February | 41° | 23° | 4 | 1.0 in | 8.4 h/day | 61% |
| March | 53° | 32° | 6 | 1.6 in | 9.1 h/day | 66% |
| April | 64° | 44° | 7 | 2.5 in | 9.3 h/day | 65% |
| May | 73° | 53° | 8 | 4.2 in | 10.0 h/day | 68% |
| June | 81° | 64° | 10 | 4.7 in | 9.8 h/day | 72% |
| July | 84° | 72° | 18 | 12.2 in | 8.2 h/day | 82% |
| August | 85° | 72° | 16 | 10.2 in | 9.2 h/day | 82% |
| September | 78° | 63° | 9 | 5.2 in | 8.6 h/day | 77% |
| October | 65° | 49° | 6 | 3.0 in | 8.3 h/day | 74% |
| November | 52° | 35° | 7 | 2.3 in | 7.2 h/day | 71% |
| December | 38° | 23° | 4 | 1.0 in | 7.2 h/day | 63% |