Jeju Weather: September
 |
Average Day Temperature: | 80.8°F |
|
Average Night Temperature: | 75.5°F |
|
Sea Water Temperature: | 80.5°F |
|
Number of Sunny Days: | 9 days |
| Sunshine Hours: | 11.9 - 12.9 hours | |
|
Number of Rainy Days: | 7 days |
| Precipitation Totals: | 8.4 in | |
| detailed information | ||
Temperature
| Jeju |
Air Temperature in September, °F
The highest day temperature in September 2025 was 92°F. The lowest night temperature was 70°F. The average values for day and night temperatures during September were 84.8°F и 79.0°F respectivly.
Jeju Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Jeju was 86.1°F. The maximum and minimum values were 81.0°F and 89.6°F respectively.
You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Jeju is 8.4 in. It makes september one of the most rainy months of the year.
The average wind speed in September is 11.8 mph.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Jeju in September is 6.3 hours.
Jeju on the Weather Map
| 1800 |  |
42°F | S 9 mph |
| 2100 | |
40°F | S 4 mph |
| 0000 | |
42°F | SE 2 mph |
| 0300 | |
42°F | E 4 mph |
| 0600 | |
42°F | E 6 mph |
| 0900 |  |
46°F | E 7 mph |
| 1200 | |
54°F | E 11 mph |
| 1500 |  |
54°F | E 13 mph |