September weather forecast and climate
Seoul, South Korea

The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
September is moderately wet and cloudy in Seoul as the rain tapers down to register 170.2mm (6.7"). The average temperatures are between 17.2°C (63°F) and 25.6°C (78.1°F) with a drop in humidity that sees it below 70%.
The conditions improve in comparison with the heat of summer and the wetness of the rainy season. The sunshine improves to 6 hours a day, and the skies remain clear during sunny periods.
Seoul is prone to flooding during the rainy season, so check the weather conditions, while planning a visit.

What is the temperature in September in Seoul?

In Seoul, in September, the average high-temperature is 25.8°C (78.4°F), and the average low-temperature is 17.2°C (63°F).
Average temperature in September - Seoul, South Korea
  • Average high temperature in September: 25.8°C

The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (1.5°C).

  • Average low temperature in September: 17.2°C

The month with the highest average low temperature is August (22.4°C).
The coldest month (with the lowest average low temperature) is January (-5.9°C).

Average humidity in September - Seoul, South Korea
  • Average humidity in September: 69.2%

The month with the highest relative humidity is July (78.3%).
The month with the lowest relative humidity is April (56.2%).

Average rainfall in September - Seoul, South Korea
  • Average rainfall in September: 169.3mm

The wettest month (with the highest rainfall) is July (394.7mm).
The driest month (with the lowest rainfall) is January (20.8mm).

Average rainfall days in September - Seoul, South Korea
  • Average rainfall days in September: 9.1 days

The month with the highest number of rainy days is July (16.3 days).
The month with the lowest number of rainy days is February (5.8 days).

Average daylight in September / Average sunshine in September - Seoul, South Korea
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 5.9h

The month with most sunshine is May (Average sunshine: 6.9h).
The month with least sunshine is July (Average sunshine: 3.9h).

Average UV index in September - Seoul, South Korea
  • Average UV index in September: 7

The month with the highest UV index is July (UV index 10).
Months with the lowest UV index are January and December (UV index 2).

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