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Monthly climate in Sejong, South Korea

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sejong features a humid continental climate (Dfa).Temperatures typically range between -1 °C (31 °F) and 27 °C (81 °F) through the year, but rarely can drop to -18 °C (-1 °F) or can rise to as high as 40 °C (105 °F).The average annual precipitation amounts to about 1110 mm (43.7 inches) and receives 90 rainy days on the 1 mm (0.04 inches) threshold annually.Sejong enjoys an average of 3153 hours of sunshine throughout the year, and daylight varies from 9 hours 42 minutes to 14 hours 35 minutes per day.

Monthly average temperatures in Sejong, South Korea §

The warmest months in Sejong are June, July and August, with daily mean temperatures ranging from 23 to 27 °C (74 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 1 °C (31 - 34 °F) throughout the day. On average each year, Sejong experiences 108 days above 25 °C (77.0 °F) and 87 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sejong, South Korea.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 15°C
(58°F)		 21°C
(69°F)		 23°C
(74°F)		 29°C
(85°F)		 32°C
(90°F)		 36°C
(96°F)		 38°C
(100°F)		 40°C
(105°F)		 31°C
(88°F)		 30°C
(86°F)		 21°C
(71°F)		 15°C
(60°F)
Mean maximum 11°C
(53°F)		 15°C
(59°F)		 21°C
(70°F)		 28°C
(83°F)		 31°C
(88°F)		 33°C
(92°F)		 35°C
(94°F)		 36°C
(97°F)		 30°C
(86°F)		 27°C
(81°F)		 21°C
(69°F)		 13°C
(56°F)
Average high 4°C
(40°F)		 6°C
(44°F)		 14°C
(57°F)		 19°C
(67°F)		 25°C
(77°F)		 29°C
(84°F)		 30°C
(86°F)		 31°C
(88°F)		 26°C
(79°F)		 20°C
(69°F)		 14°C
(57°F)		 6°C
(43°F)
Daily mean -1°C
(31°F)		 1°C
(34°F)		 8°C
(46°F)		 13°C
(56°F)		 19°C
(66°F)		 23°C
(74°F)		 26°C
(79°F)		 27°C
(81°F)		 21°C
(71°F)		 15°C
(59°F)		 8°C
(46°F)		 1°C
(34°F)
Average low -5°C
(23°F)		 -4°C
(26°F)		 2°C
(36°F)		 7°C
(45°F)		 13°C
(55°F)		 18°C
(65°F)		 23°C
(73°F)		 23°C
(75°F)		 17°C
(63°F)		 10°C
(50°F)		 3°C
(37°F)		 -3°C
(27°F)
Mean minimum -13°C
(10°F)		 -10°C
(15°F)		 -4°C
(26°F)		 -0°C
(32°F)		 6°C
(44°F)		 14°C
(57°F)		 19°C
(67°F)		 19°C
(66°F)		 11°C
(52°F)		 2°C
(36°F)		 -3°C
(26°F)		 -10°C
(14°F)
Minimum -18°C
(-1°F)		 -13°C
(10°F)		 -5°C
(22°F)		 -3°C
(28°F)		 3°C
(38°F)		 12°C
(54°F)		 18°C
(65°F)		 16°C
(61°F)		 8°C
(47°F)		 1°C
(34°F)		 -4°C
(25°F)		 -12°C
(10°F)

Compare climate in Sejong with other places

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

Monthly average precipitation in Sejong, South Korea §

Sejong usually has the most precipitation in July, August and September, with an average of 13 rainy days and 207 mm (8.1 inches) of precipitation per month.The driest months in Sejong are January, February and December. On average, 26 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sejong, South Korea.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 22 (0.9) 31 (1.2) 62 (2.4) 68 (2.7) 82 (3.2) 88 (3.5) 235 (9.2) 228 (9.0) 158 (6.2) 69 (2.7) 41 (1.6) 26 (1.0)
Average precipitation days (≥ 1 mm) 3 4 6 6 9 8 15 16 9 5 5 4

Monthly sunshine hours in Sejong, South Korea §

The sunniest months in Sejong are April, May and June, when the sun shines an average of 9 hours 56 minutes a day.Least sunny months in Sejong: January, November and December receive an average of 7 hours 7 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sejong, South Korea.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 193 238 278 284 309 310 277 283 250 264 229 232
Mean daily daylight hours 9h 57m 10h 50m 11h 57m 13h 7m 14h 6m 14h 35m 14h 20m 13h 29m 12h 22m 11h 13m 10h 13m 9h 42m

Solar UV radiation in Sejong, South Korea §

Sejong experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 11 - 11, 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 4. For more detailed information, check out our hourly Sejong UV Index data.

Average daily maximum UV levels by month for Sejong, South Korea.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 4 7 9 9 11 11 11 10 7 5 3