South Korea (Seoul)
September
Weather in South Korea for September 2025
Your guide to South Korea weather in September - trends and predictions
In general, the average temperature in South Korea at the beginning of September is 29.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25 °C by the end of September.
South Korea sees moderate rainfall in September, averaging 10 rainy days.
Is September a good time to visit South Korea? check out the best time to travel to South Korea page.
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Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
26°/20°
Temperatures
10 km/h
Avg max wind
67 %
Avg humidity
South Korea in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2  28° | 3  29° | 4 31° | 5 30° | 6 30° | 7 31° |
| 8 31° | 9 31° | 10 31° | 11  32° | 12  28° | 13 25° | 14  28° |
| 15 26° | 16 26° | 17 27° | 18 28° | 19 29° | 20 25° | 21 22° |
| 22 24° | 23 25° | 24 25° | 25 25° | 26  22° | 27 24° | 28 27° |
| 29 26° | 30 26° |
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Temperatures trend during September in South Korea
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. | Sunny | 29° /21° | 0 mm | 7 | |
| 2 Sept. | Partly cloudy | 28° /20° | 0.7 mm | 7 | |
| 3 Sept. | Light rain shower | 29° /22° | 4.2 mm | 6 | |
| 4 Sept. | Light rain shower | 31° /22° | 0.9 mm | 8 | |
| 5 Sept. | Sunny | 30° /22° | 0.5 mm | 7 | |
| 6 Sept. | Partly cloudy | 30° /23° | 0.6 mm | 7 | |
| 7 Sept. | Sunny | 31° /21° | 0.1 mm | 8 | |
| 8 Sept. | Sunny | 31° /21° | 0 mm | 8 | |
| 9 Sept. | Partly cloudy | 31° /22° | 0.1 mm | 8 | |
| 10 Sept. | Partly cloudy | 31° /23° | 0 mm | 8 | |
| 11 Sept. | Cloudy | 32° /24° | 0 mm | 8 | |
| 12 Sept. | Overcast | 28° /23° | 3.7 mm | 6 | |
| 13 Sept. | Overcast | 25° /20° | 8.8 mm | 6 | |
| 14 Sept. | Mist | 28° /20° | 2.6 mm | 6 | |
| 15 Sept. | Overcast | 26° /21° | 2.5 mm | 6 | |
| 16 Sept. | Light rain shower | 26° /20° | 6.3 mm | 6 | |
| 17 Sept. | Light rain shower | 27° /23° | 9.1 mm | 6 | |
| 18 Sept. | Light rain shower | 28° /22° | 3.3 mm | 6 | |
| 19 Sept. | Patchy rain possible | 29° /22° | 6.5 mm | 7 | |
| 20 Sept. | Light rain shower | 25° /18° | 12.2 mm | 6 | |
| 21 Sept. | Patchy rain possible | 22° /16° | 30.4 mm | 5 | |
| 22 Sept. | Sunny | 24° /17° | 0.1 mm | 6 | |
| 23 Sept. | Partly cloudy | 25° /16° | 0 mm | 7 | |
| 24 Sept. | Overcast | 25° /16° | 0 mm | 6 | |
| 25 Sept. | Partly cloudy | 25° /17° | 0 mm | 7 | |
| 26 Sept. | Moderate rain | 22° /18° | 11.6 mm | 5 | |
| 27 Sept. | Patchy rain possible | 24° /18° | 1.3 mm | 6 | |
| 28 Sept. | Partly cloudy | 27° /18° | 0.7 mm | 7 | |
| 29 Sept. | Partly cloudy | 26° /17° | 0 mm | 7 | |
| 30 Sept. | Patchy rain possible | 26° /18° | 0.1 mm | 6 | |
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Important Notice
Our weather forecast for South Korea 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 South Korea forecast closer to your planned date for the most up-to-date weather information.
South Korea in September - FAQ
What are the expected maximum and minimum temperatures in South Korea during September?
During September, expect a variety of temperatures with highs around 26° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in South Korea during September?
Moderate rainfall is anticipated in South Korea during September, with a total of 66 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in South Korea during September?
The average wind speed in South Korea during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to South Korea in September?
As you prepare for your trip to South Korea 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 South Korea, 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 South Korea
Explore the daily rainfall trends and prepare for South Koreas September weather 💧
UV exposure in South Korea during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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