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Monthly climate in Jeju City, South Korea

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Jeju City features a humid subtropical climate (Cfa).Temperatures typically range between 6 °C (44 °F) and 27 °C (81 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 31 °C (88 °F).The average annual precipitation amounts to about 1421 mm (56.0 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Jeju City enjoys an average of 3139 hours of sunshine throughout the year, and daylight varies from 9 hours 57 minutes to 14 hours 19 minutes per day.

Monthly average temperatures in Jeju City, South Korea §

The warmest months in Jeju City are July, August and September, 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 6 to 9 °C (44 - 48 °F) throughout the day. On average each year, Jeju City experiences 53 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Jeju City, 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 19°C
(66°F)		 17°C
(63°F)		 18°C
(65°F)		 20°C
(69°F)		 24°C
(75°F)		 26°C
(79°F)		 31°C
(88°F)		 31°C
(88°F)		 28°C
(83°F)		 27°C
(81°F)		 22°C
(71°F)		 20°C
(68°F)
Mean maximum 15°C
(59°F)		 15°C
(59°F)		 17°C
(63°F)		 19°C
(67°F)		 23°C
(73°F)		 24°C
(76°F)		 29°C
(85°F)		 30°C
(86°F)		 28°C
(82°F)		 25°C
(77°F)		 21°C
(70°F)		 16°C
(61°F)
Average high 8°C
(47°F)		 9°C
(48°F)		 12°C
(55°F)		 15°C
(60°F)		 19°C
(67°F)		 22°C
(72°F)		 26°C
(80°F)		 28°C
(83°F)		 25°C
(77°F)		 20°C
(69°F)		 16°C
(60°F)		 10°C
(51°F)
Daily mean 6°C
(44°F)		 7°C
(44°F)		 10°C
(51°F)		 13°C
(57°F)		 17°C
(63°F)		 21°C
(70°F)		 25°C
(77°F)		 27°C
(81°F)		 23°C
(74°F)		 19°C
(66°F)		 14°C
(57°F)		 9°C
(48°F)
Average low 5°C
(41°F)		 5°C
(41°F)		 8°C
(47°F)		 12°C
(53°F)		 15°C
(60°F)		 19°C
(67°F)		 24°C
(75°F)		 26°C
(79°F)		 22°C
(72°F)		 17°C
(64°F)		 12°C
(54°F)		 7°C
(45°F)
Mean minimum 1°C
(34°F)		 1°C
(33°F)		 4°C
(39°F)		 7°C
(45°F)		 12°C
(54°F)		 17°C
(62°F)		 21°C
(70°F)		 23°C
(74°F)		 19°C
(66°F)		 13°C
(55°F)		 8°C
(46°F)		 2°C
(35°F)
Minimum -2°C
(29°F)		 -1°C
(31°F)		 3°C
(37°F)		 6°C
(43°F)		 10°C
(51°F)		 16°C
(60°F)		 19°C
(67°F)		 22°C
(72°F)		 18°C
(65°F)		 11°C
(53°F)		 6°C
(43°F)		 0°C
(33°F)

Compare climate in Jeju City with other places

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

Monthly average precipitation in Jeju City, South Korea §

Jeju City usually has the most precipitation in July, August and September, with an average of 14 rainy days and 221 mm (8.7 inches) of precipitation per month.The driest months in Jeju City are January, February and November. On average, 54 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Jeju City, 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) 58 (2.3) 59 (2.3) 101 (4.0) 91 (3.6) 92 (3.6) 141 (5.6) 170 (6.7) 197 (7.7) 298 (11.7) 109 (4.3) 46 (1.8) 61 (2.4)
Average precipitation days (≥ 1 mm) 10 9 11 7 9 10 14 15 15 9 7 10

Monthly sunshine hours in Jeju City, South Korea §

The sunniest months in Jeju City are May, July and August, when the sun shines an average of 9 hours 54 minutes a day.Least sunny months in Jeju City: January, February and December receive an average of 6 hours 33 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Jeju City, 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 166 228 266 291 304 298 298 318 266 268 230 202
Mean daily daylight hours 10h 11m 10h 58m 11h 58m 13h 0m 13h 53m 14h 19m 14h 6m 13h 20m 12h 20m 11h 19m 10h 25m 9h 57m

Solar UV radiation in Jeju City, South Korea §

Jeju City 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 / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Jeju City UV Index data.

Average daily maximum UV levels by month for Jeju City, 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) 4 6 7 9 10 11 12 12 10 7 6 4