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Seoul in September: Weather, Average temperature and Climate

Take a look at past year’s weather for Seoul in September and see if it is worth visiting.
Check flight prices to Seoul on Avionero:
September

Weather in Seoul in September 2024

Good Weather
Warm
☁️
Cloudy
✈️
$1,687 - $1,923
Are you considering a trip to Seoul in September? Well, the weather is usually on your side with an average maximum temperature of +79°F and about 11 sunny days. Just keep in mind that there may be some rain, with an average of 5 rainy days and 116 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flights in one click on Avionero.

Average weather

☀️
+79°F
Avg. max. temperature
+41°F
Min.
+91°F
Max.
116 mm
Total precipitation
71%
Avg. humidity
1 m/s
Avg. wind
11 ☀️
Sunny Days
14 ⛅️
Cloudy
5 🌦
Rainy
Our opinion: Seoul has good weather in September.

Average temperature in Seoul in September

Here are the expected maximum, average and minimum temperatures in Seoul for September based on the historical data.
Last Year
Historical Data

Going from a maximum of +88°F during the day to a minimum of +52°F during the night, the temperature in September averages around +81°F.

The average maximum temperature goes down 15% by the end of the month, compared with the beginning of the month, from +86°F to +81°F.

Is Seoul warm or cold in September?

Seoul is typically warm in September.

Maximum temperatures go down compared to the previous month from +86°F to +79°F. The minimum temperature also goes down from +72°F to +61°F.

It’s generally warm, but pack a long-sleeve shirt for evenings.

Take a look at how September is compared to other months in Seoul:

Travel to Seoul

Click to see more details
✈️
24
Flights per week
$1,687
Min. Price
$1,923
Max. Price

Climate in Seoul in September

Seoul weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
Avg. temperature
+86°F+79°F+68°F
Min. temperature
+57°F+41°F+27°F
Max. temperature
+100°F+91°F+84°F
Rainfall
222 mm116 mm48 mm
Wind
2 m/s1 m/s1 m/s
Humidity
76%71%68%
Air pressure
1006 HPa1012 HPa1018 HPa
Sunny days
51116
Cloudy days
161411
Rainy days
1054
Snowy days
000

September often has better weather than August. It’s getting colder in September. From +86°F in the day, the average maximum temperature lowers to +79°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 222 mm to 116 mm. It feels drier, as humidity decreases from 76% to 71%. Winds are calmer in comparison to August, going down from 2 m/s to 1 m/s on average. The good news is there are likely to be more sunny days in September, from 5 to 11.

October brings much the same weather, it remains good.

Wind

Wind speed in Seoul in September based on historical data.
Last Year
Historical Data

The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.

The average wind speed in Seoul is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.

Rain

Amount of rainfall in mm during September in Seoul based on historical data.
Last Year
Historical Data
Typically, there is a 20% chance of rain on an average day in September, with total rainfall of approximately 237 mm. The maximum amount of rainfall per day is around 186 mm, which is considered heavy rain. On average, there are about 6 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Seoul wettest month is July, where a typical day has a 35% chance of precipitation and 261 mm of rainfall per day. January, on the other hand, is the driest month with a mere 3% chance of precipitation and 10 mm of rainfall per day.

How was the weather last September in Seoul?

This is the weather in Seoul in September 2023:
1 September
☀️
+86°F
2 September
☀️
+86°F
3 September
☁️
+83°F
4 September
🌧️
+76°F
5 September
🌧️
+67°F
6 September
☀️
+80°F
7 September
☀️
+82°F
8 September
☀️
+84°F
9 September
☀️
+86°F
10 September
☀️
+82°F
11 September
☁️
+79°F
12 September
☀️
+81°F
13 September
☀️
+81°F
14 September
☀️
+83°F
15 September
☀️
+84°F
16 September
🌧️
+86°F
17 September
☀️
+86°F
18 September
☀️
+88°F
19 September
☀️
+84°F
20 September
☀️
+75°F
21 September
☀️
+76°F
22 September
☀️
+76°F
23 September
☀️
+71°F
24 September
☀️
+75°F
25 September
☀️
+77°F
26 September
☀️
+78°F
27 September
☀️
+81°F
28 September
☀️
+78°F
29 September
🌫️
+79°F
30 September
🌫️
+81°F
In September 2023 Seoul had 23 sunny days, 2 cloudy days, and 3 rainy days. The average maximum temperature was +81°F, with an absolute maximum of +88°F and a minimum of +68°F. The average humidity was 71%, with a maximum of 100% and a minimum of 28%. The average wind speed was 2 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change Over the Years

This is how Seoul climate has changed over the last 43 years.

The climate in Seoul in September has not changed that much over the last 43 years.

The average temperature was the lowest in 2012 (+78°F) and the highest in 1998 (+84°F). The driest year was 1996 with only 6 mm of rainfall, and the wettest year was 1999 with 369 mm.

FAQ

Frequently asked questions about the weather in Seoul in September:

Is September a good time to visit Seoul?

September is a really good time to go to Seoul. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Seoul.

Can you sunbathe in Seoul in September?

September is warm in Seoul. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.

Is Seoul rainy in September?

Seoul is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Seoul in September?

The amount of sunny days in Seoul during September varies; prepare for a mix of clouds and sun.

How much does it cost to fly to Seoul in September?

The normal prices to fly to Seoul is $1,687 - $1,923. It means that the majority of our users have picked flights in this range. To find the best price we recommend you search early, using our flexible dates feature.

Monthly weather in Seoul

Source of the data

For this page, we’ve looked at the typical weather in Seoul, based on historical hourly weather data from January 1, 1979, to December 31, 2022.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.