5-day weather forecast Seoul Sep 18, 2026

29°18° · Sunny

Weather forecast Seoul Friday Sep 18, 2026: sunny, temperature from 18 °C to 29 °C.

Precipitation probability 15%. Wind up to 4.19 m/s (gusts 8.33 m/s). Air humidity 30–63%, atmospheric pressure 765–767 mm Hg, UV index up to 7.

Sunrise 06:16
Sunset 18:35
First Quarter53% illuminated
Moonrise 13:46 · Moonset 22:51
Chart
Table

Forecast from 18 °C to 29 °C and precipitation

Temperature & Precipitation
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Temperature (°C)212120201918181819212325262729292928272523232221
Precipitation (mm/hr)000000000000000000000000

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Cloud cover (%)951008977669999656500000000263796298
Rain chance (%)12131110915151043211110011132713

Wind speed and direction

Wind & Wind gust
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Wind (m/s)1.191.611.311.611.691.611.611.6122.613.113.813.813.313.613.53.313.894.114.193.53.3932.61
Wind gust (m/s)1.392.3922.4232.722.922.533.395.3955.56.2265.7254.54.316.037.618.118.337.58.19
Wind direction (°)ENE 69°ENE 63°ENE 71°ENE 74°ENE 75°E 80°E 79°ENE 77°ENE 72°ENE 77°E 86°E 85°E 84°ESE 102°ESE 116°ESE 115°ESE 113°ESE 103°E 101°E 88°E 79°E 82°ENE 78°ENE 78°

Air humidity

Humidity
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Humidity (%)535456575961636360554842383532313031384347505356

Atmospheric pressure

Pressure
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Pressure (mm Hg)766766766766766766767767767767767767767766765765765765765766767767767767

Ultraviolet index

UV Index
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
UV Index000000045666777777700000

Air quality & pollen

Air quality
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
PM2.5 (µg/m³)15.415.414.113.11211.311.613.315.115.61514.11413.613.312.612.312.613.915.315.314.814.514
PM10 (µg/m³)1919.217.816.815.71515.316.917.919.619.719.219.319.218.91817.617.718.920.320.319.919.618.5
Ozone (O₃) (µg/m³)2831394649505046404155769310411111110286716050433835
NO₂ (µg/m³)46.942.333.125.722.220.620.925.331.733.927.717.39.46.15.37.113.121.728.93335.637.539.240.2
SO₂ (µg/m³)109.68.787.67.47.58.39.49.88.87.25.854.44.24.55.266.87.78.38.48.3
CO (µg/m³)203187167153149150157175199210196170151146147153165182193195192189190191

Seoul on the map

Data Sources & Methodology

Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.