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Weather in Jeju City for September 2026

Your guide to Jeju City weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Jeju City has been significantly cooler than historical averages by 2 °C, with average temperature of 25 °C.

  • Expect cooler weather in the next days in Jeju City with the forecast suggesting a temperature of 23.5 °C, lower than the historical average.

  • In general, the average temperature in Jeju City at the beginning of September is 27.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.3 °C by the end of September.

    • Rain 🌧️

  • Jeju City experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 265 mm.

Average dry days
3
Dry days
Average rainy days
27
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/22°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
79 %
Avg humidity

Jeju City Weather September

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

Temperatures trend during September in Jeju City

See the weather trend as well as the moving average line

September weather in Jeju City 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
 27° /23° 12.2 mm 5
2 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /23° 22.8 mm 5
3 Sept. Patchy rain possible
Patchy rain possible
 28° /23° 9 mm 6
4 Sept. Patchy rain possible
Patchy rain possible
 27° /23° 4.1 mm 6
5 Sept. Patchy rain possible
Patchy rain possible
 27° /23° 19.7 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 28° /23° 7.5 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 27° /22° 1 mm 7
8 Sept. Sunny
Sunny
 27° /22° 1.3 mm 7
9 Sept. Patchy rain possible
Patchy rain possible
 26° /21° 2 mm 6
10 Sept. Patchy rain possible
Patchy rain possible
 26° /22° 11.8 mm 6
11 Sept. Patchy rain possible
Patchy rain possible
 26° /22° 6.1 mm 7
12 Sept. Patchy rain possible
Patchy rain possible
 27° /23° 3.2 mm 7
13 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /23° 20.7 mm 6
14 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /23° 38.8 mm 6
15 Sept. Overcast
Overcast
 23° /20° 0.1 mm 6.2
16 Sept. Overcast
Overcast
 23° /20° 1 mm 7.5
17 Sept. Patchy rain possible
Patchy rain possible
 23° /21° 0.4 mm 5.9
18 Sept. Patchy rain possible
Patchy rain possible
 23° /21° 1.9 mm 5
19 Sept. Patchy rain possible
Patchy rain possible
 22° /21° 0.8 mm 5
20 Sept. Sunny
Sunny
 23° /20° 0.1 mm 6
21 Sept. Sunny
Sunny
 24° /19° 0 mm 6
22 Sept. Sunny
Sunny
 25° /20° 0.3 mm 6
23 Sept. Sunny
Sunny
 23° /21° 0 mm 6
24 Sept. Sunny
Sunny
 25° /20° 0 mm 6
25 Sept. Sunny
Sunny
 25° /21° 0 mm 6
26 Sept. Overcast
Overcast
 27° /22° 0 mm 7
27 Sept. Patchy rain possible
Patchy rain possible
 23° /18° 9.3 mm 5
28 Sept. Overcast
Overcast
 20° /16° 0 mm 5
29 Sept. Patchy rain possible
Patchy rain possible
 25° /20° 0.8 mm 6
30 Sept. Sunny
Sunny
 25° /19° 3 mm 6
Next
Important Notice
Our weather forecast for Jeju City 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 City forecast closer to your planned date for the most up-to-date weather information.
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Jeju City in September - FAQ

What are the expected maximum and minimum temperatures in Jeju City 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 City during September?
Significant rainfall exceeding 265 mm is expected in Jeju City during September, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Jeju City during September?
The average wind speed in Jeju City during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Jeju City

Explore the daily rainfall trends and prepare for Jeju Citys September weather 💧
Typically, Jeju City has 27 rainy days in September with a total of 265 mm of rainfall.

UV exposure in Jeju City 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 Jeju City, located at latitude 33.51 and longitude 126.522. Stay updated with localized weather information tailored for Jeju City.

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