Jeju City
September
Weather in Jeju City for September 2025
Your guide to Jeju City weather in September - trends and predictions
Heavy Rain Advisory - See hour by hour.
So far, September 2025 in Jeju City is slightly warmer than the historical average by 1.2 °C.
Expect cooler weather in the next days in Jeju City with the forecast suggesting a temperature of 25.4 °C, lower than the historical average.
In general, the average temperature in Jeju City at the beginning of September is 27.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25.1 °C by the end of September.
Jeju City experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 300.6 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
9
Dry days
21
Rainy days
0
Snow days
26°/22°
Temperatures
22 km/h
Avg max wind
79 %
Avg humidity
Jeju City Weather September
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Temperatures trend during September in Jeju City
See the weather trend as well as the moving average line
September weather in Jeju City day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 27° /23° | 14 mm | 6 | |
| 2 Sept. |  Moderate or heavy rain shower | 27° /23° | 26.9 mm | 6 | |
| 3 Sept. | Patchy rain possible | 28° /23° | 10.5 mm | 6 | |
| 4 Sept. | Patchy rain possible | 27° /23° | 4.1 mm | 6 | |
| 5 Sept. |  Heavy rain at times | 28° /23° | 23.5 mm | 6 | |
| 6 Sept. | Heavy rain at times | 28° /23° | 8.5 mm | 6 | |
| 7 Sept. | Patchy rain possible | 28° /22° | 1.1 mm | 7 | |
| 8 Sept. |  Cloudy | 28° /22° | 1.5 mm | 7 | |
| 9 Sept. | Patchy rain possible | 26° /22° | 2.3 mm | 6 | |
| 10 Sept. | Light rain shower | 27° /22° | 14.1 mm | 6 | |
| 11 Sept. | Patchy rain possible | 27° /22° | 7.3 mm | 6 | |
| 12 Sept. | Patchy rain possible | 28° /24° | 3.9 mm | 6 | |
| 13 Sept. | Moderate or heavy rain shower | 27° /24° | 24.8 mm | 6 | |
| 14 Sept. | Moderate or heavy rain shower | 27° /23° | 43.7 mm | 6 | |
| 15 Sept. |  Moderate rain | 29° /25° | 7.9 mm | 1.8 | |
| 16 Sept. | Patchy rain possible | 30° /25° | 4 mm | 2 | |
| 17 Sept. | Patchy rain possible | 29° /25° | 2.9 mm | 1.4 | |
| 18 Sept. | Moderate rain | 25° /23° | 5.6 mm | 0.8 | |
| 19 Sept. | Patchy rain possible | 23° /22° | 2.1 mm | 0.9 | |
| 20 Sept. | Patchy rain possible | 23° /19° | 2 mm | 5 | |
| 21 Sept. | Patchy rain possible | 24° /19° | 0.6 mm | 5 | |
| 22 Sept. | Patchy rain possible | 24° /21° | 0.7 mm | 5 | |
| 23 Sept. | Patchy rain possible | 24° /23° | 0.9 mm | 5 | |
| 24 Sept. | Patchy rain possible | 24° /23° | 0.6 mm | 5 | |
| 25 Sept. | Moderate rain | 25° /23° | 5.7 mm | 5 | |
| 26 Sept. | Patchy rain possible | 26° /22° | 2.8 mm | 5 | |
| 27 Sept. | Moderate rain | 24° /23° | 14.9 mm | 5 | |
| 28 Sept. | Moderate rain | 26° /24° | 8.5 mm | 5 | |
| 29 Sept. | Patchy rain possible | 26° /20° | 0.9 mm | 7 | |
| 30 Sept. | Moderate or heavy rain shower | 25° /19° | 3.7 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Jeju City in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Jeju City forecast closer to your planned date for the most up-to-date weather information.
Change Month
Jeju City in September - FAQ
What are the expected maximum and minimum temperatures in Jeju City during September?
During September, expect a variety of temperatures with highs around 26° and lows near 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in Jeju City during September?
Significant rainfall exceeding 300.6 mm is expected in Jeju City during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Jeju City during September?
The average wind speed in Jeju City during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Jeju City
Explore the daily rainfall trends and prepare for Jeju Citys September weather 💧
UV exposure in Jeju City during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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