What is the weather like in Jeju vs Seoul in September?

In September, Jeju averages 27°C high / 22°C low with about 239 mm of rain; Seoul averages 28°C high / 19°C low with about 148 mm.

Jeju vs Seoul in September

Seoul is the better pick in September — 75 vs 69 on SeasonMap's comfort score. Seoul is hot, rainy, muggy air, while Jeju is hot, soaked, muggy air.

Jeju vs Seoul — September climate, side by side

	🇰🇷 Jeju	🇰🇷 Seoul
Comfort score	69/100 (C)	75/100 (B)
Feels-like high	30°C	30°C
Avg high / low	27° / 22°	28° / 19°
Rainfall	239 mm	148 mm
Rainy days	15	9
Humidity	81%	79%
Air quality (AQI)	62	73

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Jeju 🇰🇷 South Koreahot, soaked, muggy air · best August69
Seoul 🇰🇷 South Koreahot, rainy, muggy air · best May75

Jeju vs Seoul in September — FAQ

Is September better in Jeju or Seoul?: Seoul is the better pick in September — 75 vs 69 on SeasonMap's comfort score. Seoul is hot, rainy, muggy air, while Jeju is hot, soaked, muggy air.
What is the weather like in Jeju vs Seoul in September?: In September, Jeju averages 27°C high / 22°C low with about 239 mm of rain; Seoul averages 28°C high / 19°C low with about 148 mm.