South KoreaAverage weather for Jeju in September
It's warm in September in Jeju with an average temperature of 26°C. Temperatures this month range from a low of 25°C to a high of 28°C. At night, you can expect temperatures between 20°C and 23°C.
Start of September
The month of September starts in Jeju with hot temps, averaging around 28°C during the day and nights around 23°C. There are plenty of days with a good chance of precipitation.
Mid September
By mid-September, daytime temps drop to around 27°C, with nights around 22°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
Since it cools down at night, it’s a good idea to wear layers.
End of September
By the end of September, the average daytime temperature in Jeju is around 26°C, while nighttime temps are about 21°C. There’s a significant chance of many days with precipitation.
Because temperatures drop in the evening, wearing layers is recommended.
Water temperature
The water temperature at Jeju is 24°C this month. Comfortable for a swim.
In September, there is an average of 265 mm of precipitation, spread over 11 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
Jeju in September |
New York | ||
|---|---|---|---|
 Average temperature |
26°C | 27°C | |
 Max. temperature |
28°C | 31°C | |
| Min. temperature |
25°C | -5°C | |
 Total precipitation |
265 mm | 57 mm | |
| Rainy days |
11 days | 9 days | |
August
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit Jeju?
Looking for sun? September isn’t a good month to be in Jeju. The temperature is nice, but there’s too much chance of rain.
Temperature records
With 33°C in 2021, Jeju reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 21°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 16°C to a highest value of 26°C.
Check out the climate of Jeju for all months and discover the best travel time
Curious about the weather in other parts of South Korea? Check out the climate and weather for spots like Seoul, Busan, or explore other destinations in South Korea.
Daily Temperature in September in Jeju
This chart shows the average daily high and low temperatures in September for Jeju, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Jeju
The chart below shows the average daily precipitation in September for Jeju, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 11 days of precipitation in Jeju.
Daily UV index in September in Jeju
This chart shows the average daily UV index in September in Jeju, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Jeju over the years
This chart shows the average temperature in September in Jeju, measured in degrees Celsius, over the past few years.
Total precipitation in September in Jeju over the years
This chart shows the average precipitation in September in Jeju, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in September for Jeju
Click on any day in September to get detailed info about the usual weather on that day in Jeju. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Jeju
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Average weather in Jeju by month
Click on a month below to see detailed weather info for Jeju. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
