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Weather in Ulsan for September 2026

Your guide to Ulsan weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Ulsan is cooler than usual, with temperatures averaging 26.2 °C, this is 2.1 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Ulsan with the forecast suggesting a temperature of 25.1 °C, lower than the historical average.

  • In general, the average temperature in Ulsan at the beginning of September is 29 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.4 °C by the end of September.

    • Rain 🌧️

  • Ulsan in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 147.2 mm.

Average dry days
13
Dry days
Average rainy days
17
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/20°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Ulsan Weather September

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

Temperatures trend during September in Ulsan

See the weather trend as well as the moving average line

September weather in Ulsan day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 31° /22° 0.3 mm 6
2 Sept. Moderate rain at times
Moderate rain at times
 31° /22° 3.7 mm 5
3 Sept. Patchy rain possible
Patchy rain possible
 27° /20° 1.7 mm 4
4 Sept. Sunny
Sunny
 27° /20° 0.2 mm 7
5 Sept. Partly cloudy
Partly cloudy
 29° /20° 0.2 mm 7
6 Sept. Moderate rain at times
Moderate rain at times
 29° /21° 1.7 mm 6
7 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /20° 4.7 mm 7
8 Sept. Heavy rain at times
Heavy rain at times
 28° /19° 2.4 mm 7
9 Sept. Patchy rain possible
Patchy rain possible
 24° /19° 5.7 mm 5
10 Sept. Partly cloudy
Partly cloudy
 28° /19° 0.9 mm 7
11 Sept. Overcast
Overcast
 26° /16° 0 mm 7.4
12 Sept. Mist
Mist
 26° /16° 0 mm 6
13 Sept. Overcast
Overcast
 30° /20° 0.1 mm 7.2
14 Sept. Overcast
Overcast
 28° /19° 0.2 mm 2.4
15 Sept. Patchy rain possible
Patchy rain possible
 24° /18° 5.3 mm 6
16 Sept. Overcast
Overcast
 27° /17° 0 mm 6
17 Sept. Overcast
Overcast
 26° /17° 0 mm 6
18 Sept. Overcast
Overcast
 23° /20° 1.5 mm 5
19 Sept. Overcast
Overcast
 23° /20° 0 mm 5
20 Sept. Patchy rain possible
Patchy rain possible
 25° /19° 0.1 mm 5
21 Sept. Patchy rain possible
Patchy rain possible
 23° /20° 0.1 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 27° /21° 5.8 mm 6
23 Sept. Torrential rain shower
Torrential rain shower
 23° /17° 190.2 mm 5
24 Sept. Sunny
Sunny
 21° /13° 19.9 mm 6
25 Sept. Patchy rain possible
Patchy rain possible
 25° /19° 0.2 mm 6
26 Sept. Sunny
Sunny
 27° /17° 0 mm 7
27 Sept. Patchy rain possible
Patchy rain possible
 25° /19° 0.6 mm 7
28 Sept. Patchy rain possible
Patchy rain possible
 24° /19° 1.4 mm 5
29 Sept. Patchy rain possible
Patchy rain possible
 24° /17° 0.4 mm 5
30 Sept. Sunny
Sunny
 25° /16° 1.3 mm 6
Next
Important Notice
Our weather forecast for Ulsan 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 Ulsan forecast closer to your planned date for the most up-to-date weather information.
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Ulsan in September - FAQ

What are the expected maximum and minimum temperatures in Ulsan during September?
During September, expect a variety of temperatures with highs around 27° and lows near 20°, suitable for diverse activities and preferences.

How much rainfall should be expected in Ulsan during September?
Significant rainfall exceeding 147.2 mm is expected in Ulsan during September, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Ulsan during September?
The average wind speed in Ulsan during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Ulsan

Explore the daily rainfall trends and prepare for Ulsans September weather 💧
Typically, Ulsan has 17 rainy days in September with a total of 147.2 mm of rainfall.

UV exposure in Ulsan during September

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

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Location coordinates Where is Ulsan?

Get accurate weather forecasts for Ulsan, located at latitude 35.537 and longitude 129.317. Stay updated with localized weather information tailored for Ulsan.

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