Weather in Seoul: September
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Average day temperature: | 79.9°F |
| Average night temperature: | 67.7°F | |
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Sea water temperature: | 74.9°F |
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Number of sunny days: | 15 days |
| Day length: | 11.9 - 13.0 hours | |
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Number of rainy days: | 5 days |
| Precipitation totals: | 4.1 in. | |
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forecast
| Seoul |
temperature
| Seoul |
Air temperature in September, °F
The highest day temperature during September of 2025 was 89°F. At the same time the lowest night temperature was 61°F. Daily and nightly averages during September were 79.5°F and 68.7°F.
Sea water temperature in Seoul in September, °F
The average sea water temperature in September of 2025 was 76.6°F. The highest and lowest sea temperatures during the month were 81.0°F and 72.1°F.
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Seoul in September is 4.9 in. Other months of the year show relatively similar values.
The average wind speed value in September is 5.2 mph It makes September one of the least windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 7.3.
Best time for vacation in Seoul
Seoul on a weather map
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