Jeju September weather
Jeju, South Korea · September
Forecast checks keep the trip stable
September mixes lingering summer warmth with cooler evenings, so comfort can swing within the month.
Typhoon influence can bring strong wind and heavy rain, affecting flights and exposed outdoor routes.
September averages at a glance
Average low
around 20–22°C
Average high
around 26–29°C
Average rainfall
around 180–300 mm
Wet days
about 8–12 days
What to wear in September in Jeju
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Short sleeves by day with a thin layer at night works well.
- • Rain readiness (pouch/umbrella) stays useful.
Travel tips for visiting Jeju in September
- • If typhoon forecasts appear, reduce outdoor dependence and keep indoor alternatives ready.
- • After rain, humidity can rebound—schedule slack helps.
September weather in Jeju — FAQ
Q. Do I need long sleeves in September?
A. Often short sleeves are fine in daytime, but evenings can feel cool. A thin layer keeps it flexible.
Q. Do typhoons ruin the trip?
A. Not always, but they can disrupt flights and outdoor plans. Indoor-focused pacing helps.
Explore Jeju
These pages are connected so you can compare conditions and decide for yourself.