If you plan to visit Jeju in September, the weather is typically alright, with an average high temperature of +25°C during the day and approximately 4 sunny days. Expect some rainy, though, as there are typically 18 rainy days in the month and around 166 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+25°C
Avg. max. temperature
+14°C
Min.
+32°C
Max.
166 mm
Total precipitation
77%
Avg. humidity
3 m/s
Avg. wind
4 ☀️
Sunny Days
8 ⛅️
Cloudy
18 🌦
Rainy
Our opinion: Jeju has OK weather in September.
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Average temperature in Jeju in September
Here are the expected maximum, average and minimum temperatures in Jeju for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +30°C during the day to a minimum of +19°C during the night, the temperature in September averages around +27°C.
The average maximum temperature goes down 55% by the end of the month, compared with the beginning of the month, from +27°C to +21°C.
Is Jeju warm or cold in September?
Jeju is typically warm in September.
Maximum temperatures go down compared to the previous month from +29°C to +25°C. The minimum temperature also goes down from +25°C to +21°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Jeju, here is the comparison with other months:
Climate in Jeju in September
Jeju weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+29°C
+25°C
+21°C
Min. temperature
+18°C
+14°C
+7°C
Max. temperature
+36°C
+32°C
+29°C
Rainfall
159 mm
166 mm
79 mm
Wind
3 m/s
3 m/s
3 m/s
Humidity
80%
77%
69%
Air pressure
1007 HPa
1012 HPa
1018 HPa
Sunny days
3
4
7
Cloudy days
7
8
11
Rainy days
20
18
12
Snowy days
0
0
0
September weather is still as ok as in August.It’s getting colder in September. From +29°C in the day, the average maximum temperature lowers to +25°C.Prepare for more rain. Average rainfall goes from 159 mm to 166 mm.It feels drier, as humidity decreases from 80% to 77%.The average wind speed doesn’t change much during September, staying around 3 m/s.The good news is there are likely to be more sunny days in September, from 3 to 4.
But maybe it is worth considering traveling in October as the weather gets better.
Wind speed in Jeju in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Jeju is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Jeju based on historical data.
Last Year
Historical Data
Typically, there is a 47% chance of rain on an average day in September, with total rainfall of approximately 132 mm. The maximum amount of rainfall per day is around 45 mm, which is moderate rain.September is a pretty wet month with over 14 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
September is one of the rainiest months in Jeju, here is a comparison with other months, total mm:
Jeju wettest month is June, where a typical day has a 50% chance of precipitation and 193 mm of rainfall per day. December, on the other hand, is the driest month with a mere 48% chance of precipitation and 59 mm of rainfall per day.
How was the weather last September in Jeju?
This is the weather in Jeju in September 2024:
1 September
🌧️
+27°C
2 September
☁️
+27°C
3 September
☁️
+30°C
4 September
☁️
+29°C
5 September
☀️
+28°C
6 September
☀️
+28°C
7 September
☀️
+27°C
8 September
☀️
+27°C
9 September
☀️
+27°C
10 September
☁️
+27°C
11 September
☀️
+28°C
12 September
🌧️
+28°C
13 September
🌧️
+28°C
14 September
🌧️
+26°C
15 September
☁️
+29°C
16 September
🌧️
+27°C
17 September
🌧️
+27°C
18 September
☁️
+27°C
19 September
☁️
+27°C
20 September
🌧️
+28°C
21 September
☁️
+25°C
22 September
🌧️
+24°C
23 September
☁️
+24°C
24 September
☁️
+25°C
25 September
☁️
+27°C
26 September
☁️
+27°C
27 September
☁️
+26°C
28 September
☁️
+26°C
29 September
☀️
+25°C
30 September
☁️
+21°C
In September 2024 Jeju had 7 sunny days, 15 cloudy days, and 8 rainy days. The average maximum temperature was +27°C, with an absolute maximum of +30°C and a minimum of +21°C. The average humidity was 76%, with a maximum of 94% and a minimum of 47%. The average wind speed was 3 m/s, with a maximum of 12 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change over Years
This is how Jeju climate have been changing during last 43 years period.
The climate in Jeju in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+17°C) and the highest in 2024 (+19°C). The driest year was 2005 with only 752 mm of rainfall, and the wettest year was 1985 with 1808 mm.
FAQ
Frequently asked questions about the weather in Jeju in September:
Is September a good time to visit Jeju?
It’s always a good time to visit Jeju, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Jeju in September?
September is warm in Jeju. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Jeju rainy in September?
Jeju is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Jeju in September?
Usually, it’s not very sunny in Jeju in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
Other cities in South Korea
Check out the weather for other cities in South Korea.
For this page, we’ve looked at the typical weather in Jeju, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
