Seoul
September
Weather in Seoul for September 2026
Your guide to Seoul weather in September - trends and predictions
Until now, September 2026 in Seoul is slightly cooler than the historical average by 1.5 °C.
Expect cooler weather in the next days in Seoul with the forecast suggesting a temperature of 26.6 °C, lower than the historical average.
In general, the average temperature in Seoul at the beginning of September is 28.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.4 °C by the end of September.
Seoul experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 187.5 mm.
Temperatures
Rain 🌧️
20
Dry days
10
Rainy days
0
Snow days
27°/19°
Temperatures
11 km/h
Avg max wind
67 %
Avg humidity
Seoul Weather September
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Temperatures trend during September in Seoul
See the weather trend as well as the moving average line
September weather in Seoul day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 27° /20° | 14.2 mm | 6 | |
| 2 Sept. |  Patchy rain possible | 28° /20° | 0.7 mm | 6 | |
| 3 Sept. | Patchy rain possible | 30° /20° | 1.4 mm | 7 | |
| 4 Sept. | Light rain shower | 29° /20° | 5 mm | 7 | |
| 5 Sept. |  Partly cloudy | 28° /19° | 31 mm | 7 | |
| 6 Sept. | Patchy rain possible | 27° /20° | 22.5 mm | 6 | |
| 7 Sept. | Sunny | 28° /18° | 3 mm | 7 | |
| 8 Sept. | Sunny | 30° /19° | 0 mm | 8 | |
| 9 Sept. | Sunny | 30° /19° | 0 mm | 8 | |
| 10 Sept. | Partly cloudy | 29° /19° | 0 mm | 7 | |
| 11 Sept. |  Cloudy | 30° /20° | 0.2 mm | 6 | |
| 12 Sept. |  Overcast | 28° /19° | 6.1 mm | 6 | |
| 13 Sept. | Light rain shower | 26° /19° | 8 mm | 5 | |
| 14 Sept. | Sunny | 29° /20° | 1.7 mm | 6 | |
| 15 Sept. | Sunny | 27° /17° | 0 mm | 6.1 | |
| 16 Sept. | Sunny | 28° /17° | 0 mm | 6.2 | |
| 17 Sept. | Overcast | 27° /19° | 0 mm | 6.3 | |
| 18 Sept. | Overcast | 28° /18° | 0 mm | 7 | |
| 19 Sept. | Sunny | 28° /17° | 0 mm | 7 | |
| 20 Sept. | Sunny | 29° /17° | 0 mm | 7 | |
| 21 Sept. | Sunny | 30° /18° | 0 mm | 7 | |
| 22 Sept. | Sunny | 29° /20° | 0.3 mm | 7 | |
| 23 Sept. | Overcast | 27° /19° | 0 mm | 6 | |
| 24 Sept. | Cloudy | 26° /19° | 0 mm | 6 | |
| 25 Sept. | Overcast | 27° /19° | 0 mm | 6 | |
| 26 Sept. | Overcast | 22° /17° | 9.5 mm | 5 | |
| 27 Sept. | Patchy rain possible | 21° /16° | 2.6 mm | 5 | |
| 28 Sept. | Sunny | 24° /14° | 0 mm | 6 | |
| 29 Sept. | Sunny | 25° /17° | 6.2 mm | 6 | |
| 30 Sept. | Patchy rain possible | 26° /16° | 0.1 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Seoul 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 Seoul forecast closer to your planned date for the most up-to-date weather information.
Change Month
Seoul in September - FAQ
What are the expected maximum and minimum temperatures in Seoul during September?
During September, expect a variety of temperatures with highs around 27° and lows near 19°, suitable for diverse activities and preferences.
How much rainfall should be expected in Seoul during September?
Significant rainfall exceeding 187.5 mm is expected in Seoul during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Seoul during September?
The average wind speed in Seoul during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Seoul
Explore the daily rainfall trends and prepare for Seouls September weather 💧
Typically, Seoul has 10 rainy days in September with a total of 187.5 mm of rainfall.
UV exposure in Seoul during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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