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Monthly climate in Seosan, South Korea

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Seosan features a humid subtropical climate (Cfa). Temperatures typically range between 0 °C (32 °F) and 27 °C (80 °F) through the year, but rarely can drop to -14 °C (8 °F) or can rise to as high as 36 °C (96 °F). The average annual precipitation amounts to about 1059 mm (41.7 inches) and receives 94 rainy days on the 1 mm (0.04 inches) threshold annually. Seosan enjoys an average of 3226 hours of sunshine throughout the year, and daylight varies from 9 hours 40 minutes to 14 hours 37 minutes per day.

Monthly average temperatures in Seosan, South Korea

The warmest months in Seosan are July, August and September, with daily mean temperatures ranging from 22 to 27 °C (72 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 3 °C (32 - 37 °F) throughout the day. On average each year, Seosan experiences 79 days above 25 °C (77.0 °F) and 63 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Seosan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(55°F)		16°C
(61°F)		18°C
(65°F)		24°C
(75°F)		27°C
(81°F)		30°C
(87°F)		34°C
(94°F)		36°C
(96°F)		31°C
(88°F)		27°C
(81°F)		21°C
(70°F)		15°C
(59°F)
Mean maximum10°C
(50°F)		12°C
(53°F)		17°C
(62°F)		23°C
(73°F)		26°C
(78°F)		29°C
(84°F)		32°C
(90°F)		33°C
(92°F)		29°C
(85°F)		25°C
(77°F)		20°C
(67°F)		12°C
(54°F)
Average high3°C
(38°F)		5°C
(41°F)		11°C
(52°F)		16°C
(61°F)		21°C
(70°F)		25°C
(78°F)		28°C
(83°F)		29°C
(85°F)		25°C
(78°F)		20°C
(68°F)		13°C
(56°F)		6°C
(42°F)
Daily mean0°C
(32°F)		1°C
(34°F)		7°C
(44°F)		12°C
(53°F)		17°C
(63°F)		21°C
(71°F)		25°C
(78°F)		27°C
(80°F)		22°C
(72°F)		16°C
(61°F)		9°C
(49°F)		3°C
(37°F)
Average low-3°C
(27°F)		-2°C
(29°F)		3°C
(38°F)		8°C
(46°F)		13°C
(55°F)		18°C
(64°F)		23°C
(73°F)		24°C
(75°F)		19°C
(66°F)		13°C
(55°F)		6°C
(43°F)		-0°C
(31°F)
Mean minimum-9°C
(17°F)		-8°C
(19°F)		-2°C
(29°F)		3°C
(37°F)		8°C
(47°F)		14°C
(58°F)		19°C
(67°F)		20°C
(69°F)		14°C
(58°F)		6°C
(43°F)		0°C
(32°F)		-7°C
(20°F)
Minimum-14°C
(8°F)		-9°C
(15°F)		-5°C
(24°F)		1°C
(34°F)		6°C
(43°F)		13°C
(56°F)		18°C
(65°F)		19°C
(67°F)		12°C
(54°F)		4°C
(39°F)		-1°C
(30°F)		-8°C
(18°F)

Compare climate in Seosan with other places

Compare temperature, precipitation, sunshine, UV index in Seosan, South Korea with other places around the world.

Monthly average precipitation in Seosan, South Korea

Seosan usually has the most precipitation in July, August and September, with an average of 13 rainy days and 192 mm (7.5 inches) of precipitation per month. The driest months in Seosan are January, February and December. On average, 29 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Seosan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)23 (0.9)28 (1.1)55 (2.1)56 (2.2)82 (3.2)84 (3.3)206 (8.1)228 (9.0)141 (5.6)67 (2.6)54 (2.1)35 (1.4)
Average precipitation days (≥ 1 mm)445688141510578

Monthly sunshine hours in Seosan, South Korea

The sunniest months in Seosan are May, June and July, when the sun shines an average of 10 hours 11 minutes a day. Least sunny months in Seosan: January, November and December receive an average of 7 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Seosan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours190238283290318319298298261267230227
Mean daily daylight hours9h 56m10h 49m11h 57m13h 8m14h 7m14h 37m14h 22m13h 30m12h 23m11h 13m10h 12m9h 40m

Solar UV radiation in Seosan, South Korea

Seosan experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Seosan UV Index data.

Average daily maximum UV levels by month for Seosan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)346891011119753