5-day weather forecast Seoul 18-05-2026

Weather forecast Seoul today 18.05.2026: sunny, temperature from 16 °C to 29 °C.

No precipitation expected. Wind up to 4.81 m/s (gusts 5.53 m/s). Air humidity 18–88%, atmospheric pressure 761–764 mm Hg, UV index up to 8.9.

Sunrise 05:21
Sunset 19:37

Waxing Crescent2% illuminated
Moonrise 05:56 · Moonset 21:46

Chart

Table

Mon, May 18, 2026

Tue, May 19 →

Forecast from 16 °C to 29 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	20	20	19	19	18	18	16	20	22	24	26	27	28	29	29	28	27	27	26	24	23	23	22	22
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	7	3	2	0	0	0	0	0	0	0	0	0	0	0	0	0	0	2	0	20	100	8	94	100
Rain chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	0.89	0.19	1	0.81	0.31	0.61	1	0.61	0.61	0.81	1.31	2.19	3.19	4.19	4.81	4.31	4.31	3.81	3.5	3.11	1.61	1.81	1.19	0.61
Wind gust (m/s)	1.64	0.39	2	1.61	0.61	1.25	1.75	0.86	0.69	0.92	1.5	2.53	3.67	4.83	5.53	4.94	4.94	4.36	4.03	3.97	2.22	2.47	1.83	0.86
Wind direction (°)	W 279°	SW 233°	SE 128°	ESE 104°	NNE 29°	NNE 23°	E 97°	E 83°	ESE 111°	WSW 258°	SW 233°	SW 224°	SW 234°	WSW 245°	WSW 248°	WSW 251°	WSW 256°	WSW 255°	W 260°	W 271°	W 271°	WNW 295°	WNW 282°	W 277°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	38	39	40	41	42	43	88	39	34	29	25	21	19	18	18	20	22	23	25	28	30	31	34	35

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	764	764	763	762	762	763	763	763	763	763	763	762	762	762	761	761	761	761	761	761	762	762	763	763

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0.1	0.6	1.8	3.7	5.9	8.1	8.9	8.8	7.1	5.6	3.5	1.7	0.6	0.1	0	0	0	0

Air quality & pollen

Air quality
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
PM2.5 (µg/m³)	15.2	13.5	11.9	10.9	11.3	14.1	21.6	25.5	30.4	35	37.9	40.4	41.9	41.9	41.4	41.8	36.4	34.3	26.7	16.6	16.2	16.3	16.7	17.2
PM10 (µg/m³)	16.8	15	13.3	12.3	12.5	15.3	22.8	26.9	31.9	36.6	39.7	42.1	43.7	43.9	43.6	44.3	39.1	37.3	30.5	21.2	20.7	20.7	21.3	21.9
Ozone (O₃) (µg/m³)	149	143	132	116	92	64	41	29	23	18	12	7	4	1	0	7	26	52	76	96	114	127	134	137
NO₂ (µg/m³)	14.5	14.8	16.4	21.4	32.7	47.4	59.5	66.4	70.6	74	77.6	80.3	81.1	79.8	76.5	70.9	61.4	49.5	39.4	32.6	27.5	24	22	21.7
SO₂ (µg/m³)	15.4	14.8	14.3	14.6	16.4	19.1	21.6	23.7	25.6	27.2	28.4	29.2	29.7	29.5	29	29.1	31	33.6	34.5	32.3	28.4	25.4	24.4	24.2
CO (µg/m³)	186.9	182.9	185.9	199.9	232.9	276.9	314.9	337.9	354.9	367.9	380.9	389.9	393.9	387.9	375.9	366.9	367.9	372.9	367.9	346.9	317.9	288.9	259.9	230.9

Mon, May 18, 2026

Tue, May 19 →

Frequently asked questions about the weather in Seoul

Today in Seoul the temperature ranges from 16 °C to 29 °C, wind up to 4.81 m/s. Check the detailed hourly forecast above for more information.

The precipitation probability in Seoul today is 0%. View the full multi-day forecast above to see the rain chances for each upcoming day.

The wind speed in Seoul today reaches up to 4.81 m/s with gusts up to 5.53 m/s. Check the detailed wind chart above for hourly wind data.

The air humidity in Seoul today ranges from 18% to 88%. View the humidity chart above for hourly details.

The UV index in Seoul today reaches up to 8.9. Check the UV index chart above for hourly values throughout the day.

The atmospheric pressure in Seoul today ranges from 761 to 764 mm Hg. View the pressure chart above for hourly readings.

Cloud cover in Seoul today reaches up to 100%. Check the cloud cover chart above for hourly details throughout the day.

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.

Learn more about our methodology →