Jeju monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Jeju

Jeju average temperature chart (Celsius) Jeju average temperature chart (Fahrenheit)
Average monthly temperatures in Jeju (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.4 7.1 10.6 15.4 19.4 22.4 26.3 27.7 24.2 19.8 14.4 9.2
°F 43.5 44.8 51.1 59.8 66.8 72.4 79.3 81.9 75.6 67.7 57.8 48.5

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Jeju monthly rainfall chart (mm) Jeju monthly rainfall chart (inches)
Average monthly rainfall in Jeju (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 59 78 97 145 155 252 280 248 180 81 76 46
inches 2.3 3.1 3.8 5.7 6.1 9.9 11 9.8 7.1 3.2 3 1.8
Rainy days 12 11 11 11 10 13 14 12 11 8 9 11

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Jeju

Jeju average daily sunshine chart
Average daily sunshine Jeju
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 4.4 5.2 6.5 7 7.5 6.5 6.5 7.8 6.8 7 5.8 4.6

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Jeju average minimum / maximum temperatures (Celsius) Jeju average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Jeju (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -0.1 0.3 3 7.4 11.5 15.9 20.9 21.7 17.6 12.1 6.8 2
Max °C 6.6 7.3 10.8 15.6 19.6 22.6 26.4 27.9 24.4 20 14.5 9.4
Min °F 31.8 32.5 37.4 45.4 52.7 60.6 69.7 71 63.6 53.8 44.2 35.7
Max °F 37.8 38.8 44.4 52.7 59.9 66.7 74.6 76.6 69.8 60.9 51.2 42.3

Sea temperature

The graph below shows the average sea temperature.

Jeju average sea temperature chart (Celsius) Jeju average sea temperature chart (Fahrenheit)
Average sea temperature around Jeju in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 14.1 12.8 12.5 13.6 16.3 20.3 24.4 27.1 25.3 22.2 19.2 16.3
°F 57.3 55.1 54.5 56.5 61.3 68.6 75.8 80.8 77.5 72 66.5 61.4

Wind speed

The graph below shows the average wind speed.

Jeju average winspeed by month (km/h) Jeju average winspeed by month (mph)
Average wind speed in Jeju (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 16 16 15 14 11 11 11 11 12 12 14 15
mph 10 10 9 8 7 7 7 7 7 8 9 9

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Jeju relative humidity averages
Average relative humidity in Jeju
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
69% 69% 69% 74% 76% 83% 86% 82% 78% 71% 70% 70%
Jeju

Other monthly averages

UV index Best time to go?

Jeju weather stats

Jeju weather statistics
Hottest month: August 27.7°C 81.9°F
Driest month: December 46mm 1.8ins
Sunniest month: October 7hrs
Coldest month: January 6.4°C 43.5°F
Wettest month: July 280mm 11ins
Warmest sea: August 27.1°C 80.8°F
Map showing location of Jeju (33.50972, 126.52194)

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