Jeju weather by month

Check out Jeju weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Jeju (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
46°F maximum daytime temperature in January in Jeju46
48°F maximum daytime temperature in February in Jeju48
54°F maximum daytime temperature in March in Jeju54
63°F maximum daytime temperature in April in Jeju63
70°F maximum daytime temperature in May in Jeju70
75°F maximum daytime temperature in June in Jeju75
82°F maximum daytime temperature in July in Jeju82
84°F maximum daytime temperature in August in Jeju84
79°F maximum daytime temperature in September in Jeju79
70°F maximum daytime temperature in October in Jeju70
61°F maximum daytime temperature in November in Jeju61
52°F maximum daytime temperature in December in Jeju52
Min temperature (night-time)
34°F minimum night-time temperature in January in Jeju34
36°F minimum night-time temperature in February in Jeju36
39°F minimum night-time temperature in March in Jeju39
48°F minimum night-time temperature in April in Jeju48
55°F minimum night-time temperature in May in Jeju55
63°F minimum night-time temperature in June in Jeju63
72°F minimum night-time temperature in July in Jeju72
73°F minimum night-time temperature in August in Jeju73
66°F minimum night-time temperature in September in Jeju66
55°F minimum night-time temperature in October in Jeju55
46°F minimum night-time temperature in November in Jeju46
37°F minimum night-time temperature in December in Jeju37
Heat & Humidity
No heat & humidity in January in Jeju0
No heat & humidity in February in Jeju0
No heat & humidity in March in Jeju0
No heat & humidity in April in Jeju0
No heat & humidity in May in Jeju0
No heat & humidity in June in Jeju0
High heat & humidity in July in JejuH
High heat & humidity in August in JejuH
Low heat & humidity in September in JejuL
No heat & humidity in October in Jeju0
No heat & humidity in November in Jeju0
No heat & humidity in December in Jeju0
Sea temperature
59°F sea temperature in January in Jeju59
57°F sea temperature in February in Jeju57
55°F sea temperature in March in Jeju55
57°F sea temperature in April in Jeju57
61°F sea temperature in May in Jeju61
68°F sea temperature in June in Jeju68
75°F sea temperature in July in Jeju75
81°F sea temperature in August in Jeju81
77°F sea temperature in September in Jeju77
72°F sea temperature in October in Jeju72
66°F sea temperature in November in Jeju66
63°F sea temperature in December in Jeju63

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in Jeju

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
10 hours of daylight per day in January in Jeju10
11 hours of daylight per day in February in Jeju11
12 hours of daylight per day in March in Jeju12
13 hours of daylight per day in April in Jeju13
14 hours of daylight per day in May in Jeju14
14 hours of daylight per day in June in Jeju14
14 hours of daylight per day in July in Jeju14
13 hours of daylight per day in August in Jeju13
12 hours of daylight per day in September in Jeju12
11 hours of daylight per day in October in Jeju11
10 hours of daylight per day in November in Jeju10
10 hours of daylight per day in December in Jeju10
UV Index (Maximum)
UV (maximum) index 3 (Moderate) in January in Jeju3
UV (maximum) index 4 (Moderate) in February in Jeju4
UV (maximum) index 6 (High) in March in Jeju6
UV (maximum) index 8 (Very High) in April in Jeju8
UV (maximum) index 9 (Very High) in May in Jeju9
UV (maximum) index 10 (Very High) in June in Jeju10
UV (maximum) index 11 (Extreme) in July in Jeju11
UV (maximum) index 10 (Very High) in August in Jeju10
UV (maximum) index 8 (Very High) in September in Jeju8
UV (maximum) index 6 (High) in October in Jeju6
UV (maximum) index 4 (Moderate) in November in Jeju4
UV (maximum) index 3 (Moderate) in December in Jeju3

Rainfall in Jeju

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
12 days with some rainfall in January in Jeju12
11 days with some rainfall in February in Jeju11
10 days with some rainfall in March in Jeju10
11 days with some rainfall in April in Jeju11
10 days with some rainfall in May in Jeju10
12 days with some rainfall in June in Jeju12
13 days with some rainfall in July in Jeju13
11 days with some rainfall in August in Jeju11
10 days with some rainfall in September in Jeju10
7 days with some rainfall in October in Jeju7
9 days with some rainfall in November in Jeju9
10 days with some rainfall in December in Jeju10
Average monthly rainfall (inches)
2.4 inches monthly rainfall in January in Jeju2.4
3.1 inches monthly rainfall in February in Jeju3.1
3.6 inches monthly rainfall in March in Jeju3.6
5.3 inches monthly rainfall in April in Jeju5.3
5.5 inches monthly rainfall in May in Jeju5.5
9.3 inches monthly rainfall in June in Jeju9.3
10.5 inches monthly rainfall in July in Jeju10.5
10.0 inches monthly rainfall in August in Jeju10.0
7.4 inches monthly rainfall in September in Jeju7.4
3.3 inches monthly rainfall in October in Jeju3.3
3.1 inches monthly rainfall in November in Jeju3.1
1.9 inches monthly rainfall in December in Jeju1.9

More about Jeju

Jeju by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for South Korea (Jeju) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Jeju?

Jeju has a temperate climate with hot summers and some rainfall in all months.

Jeju weather in January

Expect daytime maximum temperatures of 46°F in Jeju, South Korea in January based on long-term weather averages. There are 4 hours of sunshine per day on average with 12 days with some rainfall and typically 2.4 inches of rainfall in the month.

  • 46°F maximum daytime temperature in January in Jeju46
    46°F max day temperature
  • 4 hours of sunshine per day
  • 12 days with some rainfall in January in Jeju12
    12 days with some rainfall
  • 34°F minimum night-time temperature in January in Jeju34
    34°F min night temperature
  • 10 hours of daylight per day in January in Jeju10
    10 hours of daylight per day
  • No heat & humidity in January in Jeju0
    No heat & humidity
  • 2.4 inches monthly rainfall in January in Jeju2.4
    2.4 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in January in Jeju3
    3 (Moderate) UV index
  • 59°F sea temperature in January in Jeju59
    59°F sea temperature

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Jeju weather in February

Expect daytime maximum temperatures of 48°F in Jeju, South Korea in February based on long-term weather averages. There are 5 hours of sunshine per day on average with 11 days with some rainfall and typically 3.1 inches of rainfall in the month.

  • 48°F maximum daytime temperature in February in Jeju48
    48°F max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in February in Jeju11
    11 days with some rainfall
  • 36°F minimum night-time temperature in February in Jeju36
    36°F min night temperature
  • 11 hours of daylight per day in February in Jeju11
    11 hours of daylight per day
  • No heat & humidity in February in Jeju0
    No heat & humidity
  • 3.1 inches monthly rainfall in February in Jeju3.1
    3.1 inches of monthly rainfall
  • UV (maximum) index 4 (Moderate) in February in Jeju4
    4 (Moderate) UV index
  • 57°F sea temperature in February in Jeju57
    57°F sea temperature

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Jeju weather in March

Expect daytime maximum temperatures of 54°F in Jeju, South Korea in March based on long-term weather averages. There are 6 hours of sunshine per day on average with 10 days with some rainfall and typically 3.6 inches of rainfall in the month.

  • 54°F maximum daytime temperature in March in Jeju54
    54°F max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in March in Jeju10
    10 days with some rainfall
  • 39°F minimum night-time temperature in March in Jeju39
    39°F min night temperature
  • 12 hours of daylight per day in March in Jeju12
    12 hours of daylight per day
  • No heat & humidity in March in Jeju0
    No heat & humidity
  • 3.6 inches monthly rainfall in March in Jeju3.6
    3.6 inches of monthly rainfall
  • UV (maximum) index 6 (High) in March in Jeju6
    6 (High) UV index
  • 55°F sea temperature in March in Jeju55
    55°F sea temperature

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Jeju weather in April

Expect daytime maximum temperatures of 63°F in Jeju, South Korea in April based on long-term weather averages. There are 7 hours of sunshine per day on average with 11 days with some rainfall and typically 5.3 inches of rainfall in the month.

  • 63°F maximum daytime temperature in April in Jeju63
    63°F max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in April in Jeju11
    11 days with some rainfall
  • 48°F minimum night-time temperature in April in Jeju48
    48°F min night temperature
  • 13 hours of daylight per day in April in Jeju13
    13 hours of daylight per day
  • No heat & humidity in April in Jeju0
    No heat & humidity
  • 5.3 inches monthly rainfall in April in Jeju5.3
    5.3 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in April in Jeju8
    8 (Very High) UV index
  • 57°F sea temperature in April in Jeju57
    57°F sea temperature

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Jeju weather in May

Expect daytime maximum temperatures of 70°F in Jeju, South Korea in May based on long-term weather averages. There are 7 hours of sunshine per day on average with 10 days with some rainfall and typically 5.5 inches of rainfall in the month.

  • 70°F maximum daytime temperature in May in Jeju70
    70°F max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in May in Jeju10
    10 days with some rainfall
  • 55°F minimum night-time temperature in May in Jeju55
    55°F min night temperature
  • 14 hours of daylight per day in May in Jeju14
    14 hours of daylight per day
  • No heat & humidity in May in Jeju0
    No heat & humidity
  • 5.5 inches monthly rainfall in May in Jeju5.5
    5.5 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in May in Jeju9
    9 (Very High) UV index
  • 61°F sea temperature in May in Jeju61
    61°F sea temperature

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Jeju weather in June

Expect daytime maximum temperatures of 75°F in Jeju, South Korea in June based on long-term weather averages. There are 6 hours of sunshine per day on average with 12 days with some rainfall and typically 9.3 inches of rainfall in the month.

  • 75°F maximum daytime temperature in June in Jeju75
    75°F max day temperature
  • 6 hours of sunshine per day
  • 12 days with some rainfall in June in Jeju12
    12 days with some rainfall
  • 63°F minimum night-time temperature in June in Jeju63
    63°F min night temperature
  • 14 hours of daylight per day in June in Jeju14
    14 hours of daylight per day
  • No heat & humidity in June in Jeju0
    No heat & humidity
  • 9.3 inches monthly rainfall in June in Jeju9.3
    9.3 inches of monthly rainfall
  • UV (maximum) index 10 (Very High) in June in Jeju10
    10 (Very High) UV index
  • 68°F sea temperature in June in Jeju68
    68°F sea temperature

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Jeju weather in July

Expect daytime maximum temperatures of 82°F in Jeju, South Korea in July and high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 13 days with some rainfall and typically 10.5 inches of rainfall in the month.

  • 82°F maximum daytime temperature in July in Jeju82
    82°F max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in July in Jeju13
    13 days with some rainfall
  • 72°F minimum night-time temperature in July in Jeju72
    72°F min night temperature
  • 14 hours of daylight per day in July in Jeju14
    14 hours of daylight per day
  • High heat & humidity in July in JejuH
    High heat & humidity
  • 10.5 inches monthly rainfall in July in Jeju10.5
    10.5 inches of monthly rainfall
  • UV (maximum) index 11 (Extreme) in July in Jeju11
    11 (Extreme) UV index
  • 75°F sea temperature in July in Jeju75
    75°F sea temperature

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Jeju weather in August

Expect daytime maximum temperatures of 84°F in Jeju, South Korea in August and high heat and humidity based on long-term weather averages. There are 7 hours of sunshine per day on average with 11 days with some rainfall and typically 10.0 inches of rainfall in the month.

  • 84°F maximum daytime temperature in August in Jeju84
    84°F max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in August in Jeju11
    11 days with some rainfall
  • 73°F minimum night-time temperature in August in Jeju73
    73°F min night temperature
  • 13 hours of daylight per day in August in Jeju13
    13 hours of daylight per day
  • High heat & humidity in August in JejuH
    High heat & humidity
  • 10.0 inches monthly rainfall in August in Jeju10.0
    10.0 inches of monthly rainfall
  • UV (maximum) index 10 (Very High) in August in Jeju10
    10 (Very High) UV index
  • 81°F sea temperature in August in Jeju81
    81°F sea temperature

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Jeju weather in September

Expect daytime maximum temperatures of 79°F in Jeju, South Korea in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 10 days with some rainfall and typically 7.4 inches of rainfall in the month.

  • 79°F maximum daytime temperature in September in Jeju79
    79°F max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Jeju10
    10 days with some rainfall
  • 66°F minimum night-time temperature in September in Jeju66
    66°F min night temperature
  • 12 hours of daylight per day in September in Jeju12
    12 hours of daylight per day
  • Low heat & humidity in September in JejuL
    Low heat & humidity
  • 7.4 inches monthly rainfall in September in Jeju7.4
    7.4 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in September in Jeju8
    8 (Very High) UV index
  • 77°F sea temperature in September in Jeju77
    77°F sea temperature

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Jeju weather in October

Expect daytime maximum temperatures of 70°F in Jeju, South Korea in October based on long-term weather averages. There are 6 hours of sunshine per day on average with typically 3.3 inches of rainfall in the month.

  • 70°F maximum daytime temperature in October in Jeju70
    70°F max day temperature
  • 6 hours of sunshine per day
  • 7 days with some rainfall in October in Jeju7
    7 days with some rainfall
  • 55°F minimum night-time temperature in October in Jeju55
    55°F min night temperature
  • 11 hours of daylight per day in October in Jeju11
    11 hours of daylight per day
  • No heat & humidity in October in Jeju0
    No heat & humidity
  • 3.3 inches monthly rainfall in October in Jeju3.3
    3.3 inches of monthly rainfall
  • UV (maximum) index 6 (High) in October in Jeju6
    6 (High) UV index
  • 72°F sea temperature in October in Jeju72
    72°F sea temperature

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Jeju weather in November

Expect daytime maximum temperatures of 61°F in Jeju, South Korea in November based on long-term weather averages. There are 5 hours of sunshine per day on average with typically 3.1 inches of rainfall in the month.

  • 61°F maximum daytime temperature in November in Jeju61
    61°F max day temperature
  • 5 hours of sunshine per day
  • 9 days with some rainfall in November in Jeju9
    9 days with some rainfall
  • 46°F minimum night-time temperature in November in Jeju46
    46°F min night temperature
  • 10 hours of daylight per day in November in Jeju10
    10 hours of daylight per day
  • No heat & humidity in November in Jeju0
    No heat & humidity
  • 3.1 inches monthly rainfall in November in Jeju3.1
    3.1 inches of monthly rainfall
  • UV (maximum) index 4 (Moderate) in November in Jeju4
    4 (Moderate) UV index
  • 66°F sea temperature in November in Jeju66
    66°F sea temperature

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Jeju weather in December

Expect daytime maximum temperatures of 52°F in Jeju, South Korea in December based on long-term weather averages. There are 4 hours of sunshine per day on average with 10 days with some rainfall and typically 1.9 inches of rainfall in the month.

  • 52°F maximum daytime temperature in December in Jeju52
    52°F max day temperature
  • 4 hours of sunshine per day
  • 10 days with some rainfall in December in Jeju10
    10 days with some rainfall
  • 37°F minimum night-time temperature in December in Jeju37
    37°F min night temperature
  • 10 hours of daylight per day in December in Jeju10
    10 hours of daylight per day
  • No heat & humidity in December in Jeju0
    No heat & humidity
  • 1.9 inches monthly rainfall in December in Jeju1.9
    1.9 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in December in Jeju3
    3 (Moderate) UV index
  • 63°F sea temperature in December in Jeju63
    63°F sea temperature

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More about Jeju

Jeju by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for South Korea (Jeju) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Tropical storm risk: Jeju, South Korea typhoon season

% of month affected by tropical storms
0
0
0
0
0
1.6%
4.4%
6.5%
3.6%
0
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Compare Jeju weather with the UK

The weather chart below compares the average monthly maximum daytime temperature for Jeju, South Korea and the UK (London).

Maximum daytime temperature (°F)

Jeju, South Korea
UK (London)
46
45
48
45
54
50
63
55
70
63
75
68
82
72
84
72
79
66
70
59
61
50
52
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

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