South KoreaThe weather in September in Jeju
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.
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.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Jeju, South Korea. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
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.
Water temperature
The water temperature at Jeju is 24°C this month. Comfortable for a swim.
Rainfall amount
In September, there is an average of 265 mm of precipitation, spread over 19 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
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.
September weather comparison
| Jeju | New York | |
|---|---|---|
| Average temperature | 26°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 20°C | -5°C |
| Total precipitation | 265 mm | 57 mm |
| Rainy days | 19 days | 9 days |
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.
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.
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.
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.
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.
Temperature charts
These charts show the average temperatures in September in Jeju, South Korea. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Jeju
Temperature in September in Jeju over the years
Precipitation charts
These charts show the average amount of precipitation in September in Jeju, South Korea. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Jeju
Total precipitation in September in Jeju over the years
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.
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.