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Monthly climate in Gunsan, South Korea

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Gunsan features a humid subtropical climate (Cfa). Temperatures typically range between 1 °C (34 °F) and 27 °C (81 °F) through the year, but rarely can drop to -15 °C (5 °F) or can rise to as high as 35 °C (95 °F). The average annual precipitation amounts to about 1146 mm (45.1 inches) and receives 90 rainy days on the 1 mm (0.04 inches) threshold annually. Gunsan enjoys an average of 3209 hours of sunshine throughout the year, and daylight varies from 9 hours 44 minutes to 14 hours 32 minutes per day.

Monthly average temperatures in Gunsan, South Korea

The warmest months in Gunsan are July, August and September, with daily mean temperatures ranging from 23 to 27 °C (73 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 3 °C (34 - 38 °F) throughout the day. On average each year, Gunsan experiences 78 days above 25 °C (77.0 °F) and 53 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Gunsan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(57°F)		16°C
(61°F)		19°C
(66°F)		23°C
(75°F)		26°C
(80°F)		29°C
(85°F)		34°C
(94°F)		35°C
(95°F)		30°C
(87°F)		28°C
(83°F)		21°C
(70°F)		15°C
(59°F)
Mean maximum10°C
(50°F)		12°C
(54°F)		17°C
(62°F)		22°C
(72°F)		25°C
(78°F)		28°C
(82°F)		32°C
(89°F)		34°C
(93°F)		29°C
(84°F)		25°C
(78°F)		20°C
(67°F)		12°C
(55°F)
Average high4°C
(40°F)		5°C
(42°F)		11°C
(52°F)		16°C
(61°F)		21°C
(70°F)		25°C
(77°F)		28°C
(83°F)		30°C
(86°F)		25°C
(78°F)		20°C
(68°F)		14°C
(57°F)		6°C
(44°F)
Daily mean1°C
(34°F)		2°C
(36°F)		8°C
(46°F)		13°C
(55°F)		18°C
(64°F)		22°C
(72°F)		26°C
(79°F)		27°C
(81°F)		23°C
(73°F)		16°C
(62°F)		10°C
(50°F)		3°C
(38°F)
Average low-2°C
(28°F)		-1°C
(30°F)		5°C
(40°F)		10°C
(50°F)		15°C
(59°F)		20°C
(68°F)		24°C
(75°F)		25°C
(78°F)		20°C
(68°F)		13°C
(56°F)		7°C
(45°F)		0°C
(33°F)
Mean minimum-9°C
(17°F)		-7°C
(20°F)		-0°C
(31°F)		5°C
(41°F)		10°C
(51°F)		16°C
(61°F)		21°C
(70°F)		21°C
(70°F)		15°C
(60°F)		7°C
(46°F)		1°C
(35°F)		-6°C
(21°F)
Minimum-15°C
(5°F)		-10°C
(15°F)		-3°C
(27°F)		3°C
(38°F)		9°C
(48°F)		15°C
(59°F)		20°C
(68°F)		19°C
(66°F)		14°C
(57°F)		5°C
(41°F)		-0°C
(31°F)		-8°C
(17°F)

Compare climate in Gunsan with other places

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

Monthly average precipitation in Gunsan, South Korea

Gunsan usually has the most precipitation in July, August and September, with an average of 12 rainy days and 216 mm (8.5 inches) of precipitation per month. The driest months in Gunsan 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 Gunsan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)23 (0.9)32 (1.3)55 (2.2)57 (2.3)90 (3.5)102 (4.0)248 (9.8)219 (8.6)180 (7.1)65 (2.6)43 (1.7)31 (1.2)
Average precipitation days (≥ 1 mm)546588131510565

Monthly sunshine hours in Gunsan, South Korea

The sunniest months in Gunsan are May, June and August, when the sun shines an average of 10 hours 3 minutes a day. Least sunny months in Gunsan: January, November and December receive an average of 7 hours 5 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Gunsan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours190238282291312316292296257268232230
Mean daily daylight hours10h 0m10h 51m11h 58m13h 6m14h 4m14h 32m14h 18m13h 27m12h 22m11h 14m10h 15m9h 44m

Solar UV radiation in Gunsan, South Korea

Gunsan experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the 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 5. For more detailed information, check out our hourly Gunsan UV Index data.

Average daily maximum UV levels by month for Gunsan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)357991111129753