Incheon
September
Weather in Incheon for September 2025
Your guide to Incheon weather in September - trends and predictions
Heavy Rain Advisory - See hour by hour.
Until now, September 2025 in Incheon is slightly cooler than the historical average by -0.8 °C.
Expect cooler weather in the next days in Incheon with the forecast suggesting a temperature of 25.6 °C, lower than the historical average.
In general, the average temperature in Incheon at the beginning of September is 29.1 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 26.3 °C by the end of September.
The climate of Incheon in September is notably wet, with an average of 12 rainy days, and a total of 97.1 mm of precipitation.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
18
Dry days
12
Rainy days
0
Snow days
27°/21°
Temperatures
14 km/h
Avg max wind
67 %
Avg humidity
Incheon Weather September
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Temperatures trend during September in Incheon
See the weather trend as well as the moving average line
September weather in Incheon day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 28° /22° | 3 mm | 6 | |
| 2 Sept. |  Cloudy | 28° /22° | 0.2 mm | 7 | |
| 3 Sept. |  Patchy rain possible | 29° /23° | 2.1 mm | 6 | |
| 4 Sept. | Patchy rain possible | 30° /23° | 2 mm | 7 | |
| 5 Sept. | Sunny | 30° /23° | 0.3 mm | 7 | |
| 6 Sept. |  Partly cloudy | 30° /24° | 2.1 mm | 7 | |
| 7 Sept. | Sunny | 29° /23° | 0.2 mm | 7 | |
| 8 Sept. | Sunny | 29° /22° | 0 mm | 7 | |
| 9 Sept. | Partly cloudy | 30° /22° | 0.1 mm | 7 | |
| 10 Sept. | Partly cloudy | 30° /23° | 0 mm | 8 | |
| 11 Sept. | Cloudy | 31° /23° | 0 mm | 7 | |
| 12 Sept. |  Overcast | 27° /22° | 21.4 mm | 6 | |
| 13 Sept. |  Moderate rain at times | 25° /20° | 19.2 mm | 6 | |
| 14 Sept. | Overcast | 28° /21° | 2 mm | 6 | |
| 15 Sept. | Partly cloudy | 28° /23° | 0 mm | 1.4 | |
| 16 Sept. |  Moderate rain | 26° /24° | 12.9 mm | 0.5 | |
| 17 Sept. | Moderate rain | 26° /22° | 7.1 mm | 1 | |
| 18 Sept. | Patchy rain possible | 25° /20° | 0.2 mm | 0.2 | |
| 19 Sept. | Patchy rain possible | 23° /21° | 0.3 mm | 0.7 | |
| 20 Sept. | Patchy rain possible | 23° /20° | 1.5 mm | 5 | |
| 21 Sept. | Sunny | 25° /20° | 0 mm | 6 | |
| 22 Sept. | Overcast | 26° /21° | 0 mm | 5 | |
| 23 Sept. | Partly cloudy | 24° /21° | 0 mm | 6 | |
| 24 Sept. | Partly cloudy | 26° /21° | 0 mm | 6 | |
| 25 Sept. | Sunny | 26° /21° | 0 mm | 6 | |
| 26 Sept. | Partly cloudy | 28° /22° | 0 mm | 6 | |
| 27 Sept. | Sunny | 27° /22° | 0 mm | 6 | |
| 28 Sept. | Sunny | 26° /22° | 0 mm | 6 | |
| 29 Sept. | Partly cloudy | 26° /18° | 0 mm | 7 | |
| 30 Sept. | Patchy rain possible | 25° /19° | 0.2 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Incheon 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 Incheon forecast closer to your planned date for the most up-to-date weather information.
Change Month
Incheon in September - FAQ
What are the expected maximum and minimum temperatures in Incheon during September?
During September, expect a variety of temperatures with highs around 27° and lows near 21°, suitable for diverse activities and preferences.
How much rainfall should be expected in Incheon during September?
Moderate rainfall is anticipated in Incheon during September, with a total of 97.1 mm spread over approximately 12 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Incheon during September?
The average wind speed in Incheon during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Incheon
Explore the daily rainfall trends and prepare for Incheons September weather 💧
UV exposure in Incheon during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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