Travel Weather Fairy🎊 Featured event
Seoul autumn festival season
📅 Around September–October
Riverfront and city events can overlap with fall foliage demand, making major sights and weekend transport busier.
Check official source →🇰🇷 South Korea · Seoul
Seoul Weather in September
Early autumn · Typhoon riskFor Seoul, September typically brings warm daytime weather and mild nights: the 10-year average high is about 25°C (77°F), while the average low is 17°C (63°F). Rain is fairly common, with about 9 days reaching at least 1 mm of precipitation and roughly 160 mm for the month.
Avg high77.5°F 25.3°CAvg low63.4°F 17.4°CRainy days~9.4 daysMonthly rain160.1 mm
🧳 Packing guide
What to wear in Seoul in September
Packing for Seoul in September is easiest with layers: light daytime clothing is usually comfortable, but add a thin cardigan or light jacket for evenings. A compact rain shell is useful, and the latest typhoon and transport updates matter more than long-range averages close to departure.
Travel takeaway: This can still be a rewarding time to visit, but keep outdoor plans flexible and recheck the short-range forecast before travel.
🗓️ Travel timing at a glance
Seoul: 12-month travel weather
Seoul has four distinct seasons, a summer monsoon, hot and humid July–August weather, and cold winters with occasional snow.
JanMidwinter · Cold wave riskFebWinter · Cold wave riskMarEarly springAprSpringMayLate springJunEarly summer · Rainy season beginsJulRainy season · Heat wave riskAugMidsummer · Heat wave riskSepEarly autumn · Typhoon riskOctAutumnNovLate autumnDecWinter · Cold wave risk
Monthly labels summarize typical climate patterns for trip planning. Always check the latest forecast and tropical-storm alerts before departure.
🎉 Trip planning check
Seoul 2026 events & busy periods
Check major events, holidays and periods that may affect crowds, transport or opening hours.
⚠️ Busy / closure period
Lunar New Year and Chuseok holidays
📅 Lunar-calendar dates · vary each year
Some restaurants and shops close while high-speed rail and road demand rises sharply during these major family holidays.
Check official source →Event dates, holiday schedules and opening hours can change. Recheck the linked official tourism or government source before departure.
Seoul in September · recent 3 years
Compare the most recent complete year with the two years before it. Daily high / low temperatures are shown in °F.
CalendarNo measurable rain🌧️ Rain⛈️ Thunderstorm❄️ SnowHigh / Low · °F
⭐ September 2025 · latest complete year☔ 11 days · 298.1 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
28°C/23.1°C
🌧️ 23.4 mm
2
28.5°C/19.8°C
No rain
3
30.3°C/21.2°C
No rain
4
28.6°C/22.6°C
🌧️ 26 mm
5
31.1°C/22°C
No rain
6
29.9°C/23.8°C
🌧️ 36.2 mm
7
27.3°C/21.9°C
No rain
8
26.6°C/20.5°C
No rain
9
26.1°C/20.9°C
No rain
10
29.3°C/18.3°C
No rain
11
29.6°C/19°C
No rain
12
26.1°C/20.1°C
🌧️ 6.2 mm
13
26.3°C/20.1°C
🌧️ 58.2 mm
14
27.6°C/20.2°C
No rain
15
28.6°C/19.7°C
No rain
16
27.1°C/20.9°C
🌧️ 13.3 mm
17
24.2°C/20.3°C
🌧️ 27.8 mm
18
24.9°C/18.2°C
No rain
19
20.4°C/17.6°C
🌧️ 12.9 mm
20
22.6°C/16.8°C
🌧️ 29.7 mm
21
25.6°C/15.6°C
No rain
22
23.8°C/16.4°C
No rain
23
24.9°C/17.3°C
No rain
24
24.2°C/18.5°C
🌧️ 38.3 mm
25
25.4°C/18.6°C
No rain
26
25°C/16.9°C
No rain
27
26.7°C/16.7°C
No rain
28
22.7°C/18.2°C
🌧️ 23.5 mm
29
23.2°C/16.1°C
No rain
30
22.2°C/16.2°C
No rain
September 2024☔ 14 days · 210 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
28.3°C/20.8°C
No rain
2
25.5°C/20.4°C
🌧️ 27 mm
3
29.3°C/20.5°C
No rain
4
29.9°C/19.9°C
No rain
5
27.5°C/22.6°C
🌧️ 2 mm
6
25.9°C/21.5°C
🌧️ 1.7 mm
7
29.1°C/21.1°C
🌧️ 1.7 mm
8
29.9°C/20.1°C
No rain
9
31.2°C/22.3°C
No rain
10
31.4°C/23.4°C
No rain
11
32.7°C/22.7°C
🌧️ 8.3 mm
12
25.3°C/24°C
🌧️ 28.4 mm
13
27.6°C/23.4°C
🌧️ 17.2 mm
14
29.3°C/23.5°C
🌧️ 1.6 mm
15
29.8°C/22.2°C
No rain
16
31°C/20.5°C
No rain
17
30.8°C/24.7°C
🌧️ 5.6 mm
18
29.7°C/23.7°C
🌧️ 10.9 mm
19
29.4°C/24.5°C
🌧️ 1.5 mm
20
26.9°C/16.9°C
🌧️ 69.6 mm
21
21.7°C/17.1°C
🌧️ 28.3 mm
22
23.6°C/17.3°C
No rain
23
23.7°C/14.8°C
No rain
24
23.5°C/13.7°C
No rain
25
25.9°C/16.1°C
No rain
26
26°C/18.6°C
🌧️ 3.4 mm
27
26°C/16.4°C
No rain
28
26°C/17.8°C
No rain
29
26.5°C/17.8°C
No rain
30
25.4°C/15.8°C
No rain
September 2023☔ 13 days · 144.9 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
27.8°C/18.1°C
No rain
2
29.1°C/18°C
No rain
3
29.1°C/22°C
🌧️ 2.4 mm
4
27.7°C/22°C
🌧️ 7.1 mm
5
30.5°C/23.2°C
🌧️ 2.7 mm
6
30.2°C/22°C
No rain
7
29.6°C/18.2°C
No rain
8
28.2°C/16.5°C
No rain
9
29°C/18.8°C
No rain
10
27.6°C/19°C
No rain
11
27.9°C/21.2°C
No rain
12
28.3°C/20.2°C
No rain
13
22.9°C/19.5°C
🌧️ 19.2 mm
14
26.3°C/17.6°C
No rain
15
23.4°C/20.1°C
🌧️ 9.5 mm
16
26.3°C/20.4°C
🌧️ 25.3 mm
17
26.7°C/20.4°C
🌧️ 12.4 mm
18
26.9°C/19.7°C
🌧️ 1.3 mm
19
26.5°C/19°C
No rain
20
22.1°C/19°C
🌧️ 39.4 mm
21
22.4°C/16.2°C
No rain
22
23.8°C/12.4°C
No rain
23
24.9°C/14.8°C
No rain
24
24.3°C/15.4°C
No rain
25
23°C/17.1°C
🌧️ 1.3 mm
26
21.5°C/18.5°C
🌧️ 14.7 mm
27
23.4°C/19.6°C
🌧️ 2.8 mm
28
24.7°C/17.9°C
No rain
29
23.7°C/15.9°C
No rain
30
21.5°C/15.6°C
🌧️ 3.9 mm
Historical calendars use Open-Meteo reanalysis data. A rainy day is counted when daily precipitation is at least 1 mm. Conditions at a specific hotel, beach or station can differ.
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Current Seoul weather and 7-day forecast
When departure is close, the latest forecast matters more than long-term averages.
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Forecast data: MET Norway · CC BY 4.0 · cached by Travel Weather Fairy
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Seoul weather in other months
Switch months to compare the seasonal pattern.