5-day weather forecast Seoul 20-05-2026

Weather forecast Seoul Wednesday, May 20 20.05.2026: sunny, temperature from 19 °C to 22 °C.

Precipitation probability 67%. Wind up to 3.5 m/s (gusts 4.03 m/s). Air humidity 39–63%, atmospheric pressure 758–761 mm Hg, UV index up to 7.7.

Sunrise 05:19
Sunset 19:39

Waxing Crescent15% illuminated
Moonrise 08:10 · Moonset 23:42

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← Tue, May 19

Wed, May 20, 2026

Thu, May 21 →

Forecast from 19 °C to 22 °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)	22	22	21	21	20	20	20	20	20	21	21	22	22	22	21	20	21	21	20	19	19	19	19	19
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.01	0.03	0	0.01	0.07	0.07	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 (%)	8	7	10	14	14	12	11	12	13	22	48	48	48	47	86	73	46	83	75	72	48	49	48	47
Rain chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	67	69	0	62	100	100	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)	1.89	1.89	1.89	2	1.89	1.31	0.5	0.5	0.81	0.5	0.5	1.11	1.89	2.61	3.5	2.81	2.31	2.61	3	3.11	2.39	2.11	2.31	2.69
Wind gust (m/s)	2.89	2.92	3.03	3.25	3.11	2.08	0.75	0.67	1.11	0.67	0.64	1.36	2.31	3	4.03	3.22	2.64	3.08	3.64	3.92	3.19	2.92	3.28	3.89
Wind direction (°)	ENE 67°	ENE 60°	ENE 62°	ENE 59°	ENE 66°	ENE 65°	E 94°	E 90°	ESE 105°	E 83°	ENE 70°	S 186°	S 178°	SSE 164°	SSE 153°	SE 146°	ESE 116°	ESE 111°	ESE 123°	ESE 123°	ESE 106°	E 83°	ENE 77°	E 82°

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 (%)	39	40	42	43	44	44	45	43	44	43	42	40	40	40	48	54	52	51	55	63	63	58	57	58

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)	761	761	761	760	759	759	760	760	760	760	760	760	760	760	760	759	759	758	759	759	759	759	760	759

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	0.5	1.4	3.5	5.1	6.4	7	7.7	3.9	3.5	1.3	0.6	0.3	0	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)	15.5	15.5	15.5	17.3	18.8	21.6	23.4	25.2	27.7	27.7	25.3	21.9	19.2	17	16.1	16.3	18.4	21.2	22.8	23.1	21.2	15	12.9	15.1
PM10 (µg/m³)	20.5	20.3	20.1	21.2	22.5	25.5	27.6	29.6	32.3	32.7	30.5	27.3	24.5	22.3	21.3	21.4	23.4	25.8	27	28	26.5	22.6	21.1	27.1
Ozone (O₃) (µg/m³)	118	108	91	73	52	28	12	7	9	13	19	26	31	31	28	23	14	4	3	17	39	59	74	86
NO₂ (µg/m³)	25	31.3	41.2	52.3	66	81	90.8	92.1	88.1	82.2	74	63.9	56.5	53.5	53.2	54.5	58.7	64.6	67.4	64.7	58.9	52.4	44.6	36
SO₂ (µg/m³)	15.9	15.4	15.4	15.8	16.8	18.3	19.4	20	20.3	19.7	17.6	14.7	12.6	11.9	11.9	12.8	15.1	18.2	20	19.6	17.9	16.2	14.5	12.6
CO (µg/m³)	222.9	234.9	257.9	288.9	338.9	396.9	429.9	414.9	375.9	343.9	332.9	328.9	329.9	324.9	324.9	354.9	458.9	592.9	652.9	566.9	406.9	279.9	227.9	208.9

← Tue, May 19

Wed, May 20, 2026

Thu, May 21 →

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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.

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