Annual mean 16°C · wettest around July · prevailing wind N
Warmest
30.7 °C
Coldest
6.4 °C
Wettest
97%
Windiest
5.7 m/s
Prevailing
N
4.8 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Jeju over the whole year is 16°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 6°C. Jeju has no sharply defined rainy season: the chance of rain on a given day runs from 44% in October, the driest month, to 61% in July, the wettest. Winds in Jeju are highest in January, averaging 4.3 m/s (15 km/h), and lightest in June, at 3.3 m/s (12 km/h). The prevailing wind is from the N. The clearest skies in Jeju come in August, when the sky is typically 62% covered; December is the cloudiest month, at 78%.
Month by month Jeju climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
8°C
6°C
3°C
48%
78%
4.3 m/s
1
0
23
February
8°C
6°C
3°C
55%
75%
4.3 m/s
3
0
27
March
13°C
9°C
8°C
53%
66%
4.0 m/s
11
0
56
April
17°C
13°C
13°C
58%
66%
3.8 m/s
39
0
79
May
21°C
16°C
18°C
59%
68%
3.4 m/s
75
6
74
June
24°C
21°C
24°C
60%
72%
3.3 m/s
75
33
40
July
29°C
26°C
30°C
61%
72%
3.8 m/s
22
52
6
August
30°C
27°C
32°C
57%
62%
3.7 m/s
10
46
2
September
26°C
23°C
26°C
56%
73%
4.2 m/s
59
43
26
October
21°C
18°C
19°C
44%
67%
3.9 m/s
71
9
72
November
16°C
12°C
12°C
55%
67%
3.9 m/s
34
1
72
December
10°C
7°C
5°C
48%
78%
4.3 m/s
4
0
37
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Jeju weather by season
Year round, Jeju has days of about 8°C at their warmest in January, its coolest month, and 30°C in August, its warmest; the coolest hours of the day run from 6°C to 27°C through the year, and the average temperature over the year is 16°C around the clock. Rain is most likely around July and least likely around October. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Jeju weather in winterDecember to February
High 9°CLow 6°CRain 50%
Winter in Jeju has typical daily highs of about 9°C and lows of about 6°C, with a 50% chance of rain on a given day.
Jeju weather in springMarch to May
High 17°CLow 13°CRain 57%
Spring in Jeju has typical daily highs of about 17°C and lows of about 13°C, with a 57% chance of rain on a given day.
Jeju weather in summerJune to August
High 27°CLow 24°CRain 59%
Summer in Jeju has typical daily highs of about 27°C and lows of about 24°C, with a 59% chance of rain on a given day.
Jeju weather in autumnSeptember to November
High 21°CLow 18°CRain 52%
Autumn in Jeju has typical daily highs of about 21°C and lows of about 18°C, with a 52% chance of rain on a given day.
When is the rainy season in Jeju?
Jeju has no sharply defined rainy season: the chance of rain on a given day runs from 44% in October, the driest month, to 61% in July, the wettest.
What time of year is Jeju windiest?
Winds in Jeju are highest in January, averaging 4.3 m/s (15 km/h), and lightest in June, at 3.3 m/s (12 km/h). The prevailing wind is from the N.
What is the average temperature in Jeju year round?
The average temperature in Jeju over the whole year is 16°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 6°C.