Measurements:
°C
°F
CURRENT WEATHER
05:27
Jeju
74°F
SW 11 mph
Feels like: 74°F
Precip: 22%
World Resorts South Korea Jeju Weather

7 Day Weather Forecast

09.09
wed
DAY
76°F
W 17 mph
precip
14%
NIGHT
72°F
W 21 mph
precip
13%
09.10
thu
DAY
74°F
SW 21 mph
precip
13%
NIGHT
72°F
W 16 mph
precip
8%
09.11
fri
DAY
78°F
SW 14 mph
precip
3%
NIGHT
74°F
W 12 mph
precip
10%
09.12
sat
DAY
76°F
W 12 mph
precip
26%
NIGHT
76°F
SW 9 mph
precip
72%
09.13
sun
DAY
76°F
SW 10 mph
precip
76%
NIGHT
74°F
S 4 mph
precip
20%
09.14
mon
DAY
80°F
S 6 mph
precip
8%
NIGHT
76°F
SW 4 mph
precip
12%
09.15
tue
DAY
74°F
SW 9 mph
precip
41%
NIGHT
74°F
W 7 mph
precip
21%

Jeju Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Jeju was 28.1°F. The maximum and minimum values were 25.5°F and 29.8°F respectively.

Jeju on the Weather Map

Best Time to Visit Jeju
The most sunny months:
May 15 days
October 14 days
April 14 days
The most warm months:
August 88.3 °F
July 85.7 °F
September 80.8 °F
Warmest sea temperature:
August 84.8 °F
September 80.5 °F
July 79.6 °F
The most cold months:
January 44.2 °F
February 45.9 °F
December 48.5 °F
The most rainy months:
August 8 days
September 7 days
July 7 days
The most windy months:
January 14 mph
December 14 mph
February 14 mph
more details