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Weather in Incheon for September 2026

Your guide to Incheon weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Incheon at the beginning of September is 30.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.9 °C by the end of September.

    • Rain 🌧️

  • Incheon in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 143.5 mm.

Average dry days
11
Dry days
Average rainy days
19
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/20°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Incheon Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
30°
2
Overcast
29°
3
Light rain shower
31°
4
Partly cloudy
31°
5
Sunny
31°
6
Light drizzle
30°
7
Light rain shower
29°
8
Cloudy
30°
9
Light rain shower
29°
10
Patchy rain possible
31°
11
Patchy light drizzle
32°
12
Light rain shower
29°
13
Patchy rain possible
29°
14
Patchy rain possible
31°
15
Light rain shower
29°
16
Patchy rain possible
31°
17
Light rain shower
30°
18
Light rain shower
30°
19
Partly cloudy
29°
20
Moderate or heavy rain shower
25°
21
Moderate or heavy rain shower
26°
22
Light drizzle
23°
23
Partly cloudy
25°
24
Overcast
27°
25
Patchy rain possible
25°
26
Partly cloudy
26°
27
Mist
26°
28
Light drizzle
25°
29
Patchy rain possible
26°
30
Patchy rain possible
26°

Temperatures trend during September in Incheon

See the weather trend as well as the moving average line

September weather in Incheon day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 30° /22° 1.4 mm 7
2 Sept. Overcast
Overcast
 29° /20° 3.3 mm 6
3 Sept. Light rain shower
Light rain shower
 31° /21° 2.1 mm 7
4 Sept. Partly cloudy
Partly cloudy
 31° /21° 1.4 mm 8
5 Sept. Sunny
Sunny
 31° /21° 0 mm 8
6 Sept. Light drizzle
Light drizzle
 30° /22° 1.3 mm 7
7 Sept. Light rain shower
Light rain shower
 29° /22° 11 mm 7
8 Sept. Cloudy
Cloudy
 30° /20° 0.7 mm 7
9 Sept. Light rain shower
Light rain shower
 29° /20° 6.6 mm 7
10 Sept. Patchy rain possible
Patchy rain possible
 31° /20° 12.6 mm 7
11 Sept. Patchy light drizzle
Patchy light drizzle
 32° /22° 0.4 mm 7
12 Sept. Light rain shower
Light rain shower
 29° /22° 3.7 mm 7
13 Sept. Patchy rain possible
Patchy rain possible
 29° /22° 6.5 mm 7
14 Sept. Patchy rain possible
Patchy rain possible
 31° /22° 0.1 mm 7
15 Sept. Light rain shower
Light rain shower
 29° /22° 6.2 mm 7
16 Sept. Patchy rain possible
Patchy rain possible
 31° /23° 0.5 mm 7
17 Sept. Light rain shower
Light rain shower
 30° /22° 6.7 mm 7
18 Sept. Light rain shower
Light rain shower
 30° /21° 4.1 mm 7
19 Sept. Partly cloudy
Partly cloudy
 29° /21° 0.4 mm 7
20 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /21° 39.2 mm 6
21 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /18° 24.3 mm 6
22 Sept. Light drizzle
Light drizzle
 23° /18° 1.6 mm 6
23 Sept. Partly cloudy
Partly cloudy
 25° /16° 0.2 mm 7
24 Sept. Overcast
Overcast
 27° /17° 3.8 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 25° /18° 2.8 mm 6
26 Sept. Partly cloudy
Partly cloudy
 26° /19° 0.1 mm 6
27 Sept. Mist
Mist
 26° /18° 0.2 mm 6
28 Sept. Light drizzle
Light drizzle
 25° /19° 2.3 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
 26° /17° 0 mm 6
30 Sept. Patchy rain possible
Patchy rain possible
 26° /15° 0 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.
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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 28° and lows near 20°, suitable for diverse activities and preferences.

How much rainfall should be expected in Incheon during September?

Significant rainfall exceeding 143.5 mm is expected in Incheon during September, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Incheon during September?

The average wind speed in Incheon during September is 13 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 💧
Typically, Incheon has 19 rainy days in September with a total of 143.5 mm of rainfall.

UV exposure in Incheon during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Get accurate weather forecasts for Incheon, located at latitude 35.073 and longitude 126.7. Stay updated with localized weather information tailored for Incheon.

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