2026 Climate Averages

Weather: Seoul — September

The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.

🌟 Climate Overview

September is an excellent time to visit Seoul. Warm weather with highs of 27°C—great for outdoor activities. Rain is common, so pack an umbrella. As peak season, expect higher prices and more tourists.

6.9
GoTripzi Score Good

Based on weather comfort, crowds, prices, and activity options

Avg High

27°C

Avg Low

19°C

Rainy days

10days

Daylight

12.5h

Feels like 30°C / 21°C — humidity makes it feel warmer

Rainfall

189mm

Sunshine

8.1h/day

Humidity

80%

Very Humid
Sun Strength

5.8

High
Wind

13 km/h (gusts 29)

Is September a good time to visit Seoul?

The weather is near-perfect with ideal temperatures and minimal rain.

Now

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Feels like --
Wind --
Humidity --
UV Index --
Local time —

Air Quality

Travel Context

  • Crowds
    Very Busy
  • Travel Costs Shoulder Rates

Daylight

Sunrise

06:14

Sunset

18:43

12.5h daylight

Visiting Seoul in September: Pros & Cons

Pros

  • Comfortable temperatures for sightseeing
  • One of the best months to visit

Cons

  • Peak season — expect crowds and higher prices

Things to Do in September

Events & Festivals

🎊
Chuseok (Korean Thanksgiving)
September/October Holiday

Recommended for This Weather

🚶 Walking tours & sightseeing
🚲 Cycling & bike tours
🥾 Hiking & nature trails
🏛️ Museums & galleries
🍳 Cooking classes & food tours
🎭 Cultural tours & local experiences

Seoul Weather by Month

Month Avg High Avg Low Rain Sunshine Humidity UV Index Crowds Condition
Jan 4°C -6°C 4d (29mm) 7.4h
65% Humid
3.8 Moderate
Good
Feb 6°C -4°C 4d (23mm) 8.1h
65% Humid
5 Moderate
Good
Mar 14°C 2°C 6d (47mm) 9h
63% Moderate
6.7 High
Good
Apr 19°C 8°C 6d (61mm) 9.5h
62% Moderate
7.8 Very High
Excellent
May 23°C 13°C 9d (108mm) 9.7h
70% Humid
8.1 Very High
Excellent
Jun 28°C 19°C 10d (144mm) 9.7h
75% Humid
8.2 Very High
Good
Jul 30°C 24°C 17d (268mm) 8.2h
82% Very Muggy
6.6 High
Wet
Aug 30°C 24°C 16d (315mm) 8.1h
84% Very Muggy
5.9 High
Wet
Sep Current 27°C 19°C 10d (189mm) 8.1h
80% Very Humid
5.8 High
Excellent
Oct 20°C 11°C 7d (70mm) 7.7h
76% Humid
4.8 Moderate
Excellent
Nov 14°C 3°C 5d (48mm) 7.8h
71% Humid
3.9 Moderate
Good
Dec 4°C -5°C 5d (26mm) 7.4h
65% Humid
3.4 Moderate
Good

⚖️Find Your Ideal Month

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Your Best MonthJulScore: 8.5
1.Jul
8.52.Aug
83.Jun
7.44.Mar
5.65.May
5.66.Sep
5.67.Nov
5.68.Feb
5.29.Jan
4.710.Dec
4.711.Oct
4.312.Apr
3.8

Where to Stay

See hotels, apartments & rentals around Seoul – live prices from Booking.com, Expedia, Vrbo and more

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Seoul

K-pop capital, including palaces, Gyeongbokgung Palace and Myeongdong shopping & street food, street food markets, and ultra-modern districts.

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What to Pack for September

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces. A waterproof jacket and shoes are non-negotiable — showers are frequent.

Moderate Very Busy

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📋Essentials
👕Clothing
👟Footwear
🎒Accessories
🧴Toiletries & Health

Planning a trip to Seoul?

🔥 Peak season — book early for best rates

Frequently Asked Questions

Is September a good time to visit Seoul?
September is typically excellent for visiting Seoul, with average highs of 27°C and around 10 rainy days. Plan your activities accordingly—outdoor sightseeing is best on dry days, while rainy days are perfect for museums and indoor attractions.
Does it get cold at night in Seoul in September?
Evenings in Seoul during September are mild at 19°C. A light cardigan or long sleeves for evenings is usually enough. Outdoor dining remains comfortable, making it a great time to enjoy rooftop bars and terrace restaurants.
What should I pack for Seoul in September?
With highs of 27°C and lows of 19°C in September, we recommend: Compact umbrella, Waterproof jacket/shell, Lightweight breathable clothes, Sunscreen SPF 30+. Layering is key as temperatures can vary between air-conditioned interiors and outdoors. Comfortable walking shoes are essential for cobblestone streets.
Does it rain a lot in Seoul in September?
Seoul typically sees around 10 rainy days in September. Rain is usually in the form of brief showers rather than all-day downpours, so a compact umbrella is sufficient. Mornings tend to be drier, making them ideal for outdoor sightseeing.
How many hours of daylight are there in Seoul in September?
In September, Seoul gets approximately 12.5 hours of daylight per day. This affects how much sightseeing you can fit in—longer days mean more time for outdoor activities, while shorter days are perfect for cozy museum visits and early dinners.
Is September peak season in Seoul?
Yes, September is peak season in Seoul. Expect higher prices for accommodation and more crowds at popular attractions, but also the best weather conditions. Book hotels and major attractions in advance to secure availability and better rates.

Weather Data: Based on 2020–2025 historical climate data from Open-Meteo

Solar calculations: SunCalc (timezone: Asia/Seoul)

Last Updated: February 2026

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