Jeju-si (Jeju City)
September
Weather in Jeju-si for September 2025
Your guide to Jeju-si weather in September - trends and predictions
In general, the average temperature in Jeju-si at the beginning of September is 28 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25 °C by the end of September.
Expect significant rainfall in Jeju-si during September, with an average of 19 rainy days.
Is September a good time to visit Jeju-si? check out the best time to travel to Jeju-si page.
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11
Dry days
19
Rainy days
0
Snow days
26°/22°
Temperatures
18 km/h
Avg max wind
78 %
Avg humidity
Jeju-si in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  26° | 2  28° | 3  29° | 4  28° | 5 28° | 6  29° | 7 28° |
| 8 28° | 9 28° | 10 29° | 11 28° | 12  29° | 13  28° | 14  27° |
| 15 30° | 16 30° | 17 28° | 18 29° | 19 29° | 20 26° | 21 26° |
| 22 24° | 23 24° | 24 24° | 25 26° | 26 27° | 27 25° | 28 24° |
| 29 25° | 30  24° |
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Temperatures trend during September in Jeju-si
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Torrential rain shower | 26° /22° | 30 mm | 6 | |
| 2 Sept. | Moderate or heavy rain shower | 28° /23° | 6.4 mm | 6 | |
| 3 Sept. | Patchy rain possible | 29° /23° | 1.8 mm | 6 | |
| 4 Sept. | Partly cloudy | 28° /23° | 0.1 mm | 7 | |
| 5 Sept. | Partly cloudy | 28° /23° | 0.3 mm | 7 | |
| 6 Sept. | Sunny | 29° /23° | 0.7 mm | 7 | |
| 7 Sept. | Partly cloudy | 28° /23° | 0.6 mm | 7 | |
| 8 Sept. | Sunny | 28° /22° | 0.4 mm | 7 | |
| 9 Sept. | Patchy rain possible | 28° /23° | 0.2 mm | 6 | |
| 10 Sept. | Light rain shower | 29° /23° | 0.9 mm | 7 | |
| 11 Sept. | Light rain shower | 28° /23° | 14.8 mm | 6 | |
| 12 Sept. | Cloudy | 29° /24° | 0.4 mm | 7 | |
| 13 Sept. | Overcast | 28° /24° | 0.5 mm | 6 | |
| 14 Sept. | Moderate rain | 27° /23° | 1.8 mm | 6 | |
| 15 Sept. | Cloudy | 30° /25° | 1.4 mm | 7 | |
| 16 Sept. | Light rain shower | 30° /25° | 4.4 mm | 7 | |
| 17 Sept. | Light rain shower | 28° /24° | 5.4 mm | 6 | |
| 18 Sept. | Patchy rain possible | 29° /24° | 1.2 mm | 7 | |
| 19 Sept. | Patchy rain possible | 29° /24° | 1.2 mm | 7 | |
| 20 Sept. | Light rain shower | 26° /23° | 31.4 mm | 6 | |
| 21 Sept. | Patchy rain possible | 26° /22° | 7.4 mm | 6 | |
| 22 Sept. | Light rain shower | 24° /22° | 13.2 mm | 6 | |
| 23 Sept. | Cloudy | 24° /20° | 1.3 mm | 5 | |
| 24 Sept. | Patchy rain possible | 24° /21° | 0.8 mm | 5 | |
| 25 Sept. | Light rain shower | 26° /21° | 2.5 mm | 6 | |
| 26 Sept. | Patchy rain possible | 27° /22° | 0.1 mm | 6 | |
| 27 Sept. | Patchy rain possible | 25° /21° | 0.1 mm | 6 | |
| 28 Sept. | Patchy rain possible | 24° /21° | 0.8 mm | 5 | |
| 29 Sept. | Sunny | 25° /21° | 0.4 mm | 7 | |
| 30 Sept. | Patchy light drizzle | 24° /20° | 0.2 mm | 6 | |
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Important Notice
Our weather forecast for Jeju-si 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-si forecast closer to your planned date for the most up-to-date weather information.
Jeju-si in September - FAQ
What are the expected maximum and minimum temperatures in Jeju-si 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-si during September?
Significant rainfall exceeding 124.6 mm is expected in Jeju-si during September, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Jeju-si during September?
The average wind speed in Jeju-si during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Jeju-si in September?
As you prepare for your trip to Jeju-si in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Jeju-si, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
September rainfall patterns in Jeju-si
Explore the daily rainfall trends and prepare for Jeju-sis September weather 💧
UV exposure in Jeju-si during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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