Ulsan, South Korea climate

Cfa Humid subtropical

Ulsan has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 30°C, while the coldest is January averaging around −2°C at night. Precipitation totals about 1391 mm a year and is strongly seasonal — July alone averages 257 mm while December barely receives 31 mm.

☀️ Summers

Warm

Highs near 30°C in August.

❄️ Winters

Cold

Lows near −2°C in January.

🌧️ Rain

Wet

About 1391 mm of rain a year.

Wettest in July

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Ulsan climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	7	9	14	19	24	26	29	30	26	22	16	9
Avg temp (°C)	2	4	8	13	18	22	25	26	22	17	10	4
Avg low (°C)	−2	−1	3	8	13	17	22	23	18	11	5	−1
Precipitation (mm)	40	43	71	107	111	164	257	253	188	81	47	31

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	7	9	14	19	24	26
Avg temp (°C)	2	4	8	13	18	22
Avg low (°C)	−2	−1	3	8	13	17
Precipitation (mm)	40	43	71	107	111	164

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	30	26	22	16	9
Avg temp (°C)	25	26	22	17	10	4
Avg low (°C)	22	23	18	11	5	−1
Precipitation (mm)	257	253	188	81	47	31

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	53	57	59	59	63	74	74	68	67	55	51	50
Relative humidity (%)	76	71	71	73	77	82	87	84	79	73	73	76
Wind speed (km/h)	19.5	18.0	17.2	16.0	13.6	12.4	13.6	14.2	15.6	15.5	16.4	18.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	53	57	59	59	63	74
Relative humidity (%)	76	71	71	73	77	82
Wind speed (km/h)	19.5	18.0	17.2	16.0	13.6	12.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	74	68	67	55	51	50
Relative humidity (%)	87	84	79	73	73	76
Wind speed (km/h)	13.6	14.2	15.6	15.5	16.4	18.7

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Ulsan, a weather station, about 7 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →