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Jeju Weather in September
Late summer · Typhoon riskWeather in Jeju during September is typically warm in the daytime and mild to warm after sunset, based on 2016–2025 averages of 26°C (79°F) / 22°C (71°F). The 10-year average shows around 19 rainy days and about 354 mm of monthly precipitation, so rain is a major part of trip planning.
Avg high78.8°F 26.0°CAvg low71.4°F 21.9°CRainy days~18.8 daysMonthly rain354.3 mm
🧳 Packing guide
What to wear in Jeju in September
For what to wear in Jeju in September, light daytime clothing is usually comfortable, with one light layer for strong air-conditioning or late evenings. A compact rain shell is useful, and the latest typhoon and transport updates matter more than long-range averages close to departure.
Travel takeaway: This can still be a rewarding time to visit, but keep outdoor plans flexible and recheck the short-range forecast before travel.
🗓️ Travel timing at a glance
Jeju: 12-month travel weather
Jeju combines four seasons with a windy maritime climate. Summer monsoon rain and late-summer typhoons can affect flights, ferries and outdoor plans.
JanWinter · WindyFebWinter · WindyMarEarly spring · WindyAprSpringMayLate spring · WindyJunRainy seasonJulRainy season · HeatAugMidsummer · Typhoon riskSepLate summer · Typhoon riskOctAutumn · WindyNovLate autumn · WindyDecWinter · Windy
Monthly labels summarize typical climate patterns for trip planning. Always check the latest forecast and tropical-storm alerts before departure.
🎉 Trip planning check
Jeju 2026 events & busy periods
Check major events, holidays and periods that may affect crowds, transport or opening hours.
⚠️ Busy / closure period
Summer peak and typhoon season
📅 July–September
Peak-season demand can overlap with typhoon disruption, so check cancellation terms for flights, rental cars and marine activities.
Check official source →Event dates, holiday schedules and opening hours can change. Recheck the linked official tourism or government source before departure.
Jeju in September · recent 3 years
Compare the most recent complete year with the two years before it. Daily high / low temperatures are shown in °F.
CalendarNo measurable rain🌧️ Rain⛈️ Thunderstorm❄️ SnowHigh / Low · °F
⭐ September 2025 · latest complete year☔ 25 days · 174.5 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
31.2°C/25.8°C
🌧️ 3.6 mm
2
29.5°C/26.2°C
🌧️ 6.2 mm
3
30.6°C/24.7°C
🌧️ 4.4 mm
4
30.5°C/25.5°C
🌧️ 1.3 mm
5
30°C/25.4°C
🌧️ 6.5 mm
6
31.1°C/25°C
🌧️ 1.9 mm
7
31.9°C/27.3°C
🌧️ 2.1 mm
8
29.9°C/25.9°C
🌧️ 8.3 mm
9
28.4°C/24.8°C
🌧️ 9.9 mm
10
26.8°C/24.1°C
🌧️ 8 mm
11
27.1°C/24.4°C
🌧️ 4 mm
12
31.3°C/25.1°C
🌧️ 5.3 mm
13
30.3°C/27°C
🌧️ 10 mm
14
28.9°C/25.3°C
🌧️ 22 mm
15
29.1°C/24.8°C
🌧️ 21 mm
16
30.9°C/25.4°C
No rain
17
31.5°C/25.6°C
No rain
18
26.6°C/23.7°C
🌧️ 3.2 mm
19
28.5°C/23.8°C
No rain
20
26.8°C/22.4°C
🌧️ 13.3 mm
21
25.6°C/21.7°C
🌧️ 1.2 mm
22
27.1°C/22.2°C
🌧️ 2.4 mm
23
26°C/23.3°C
No rain
24
29.7°C/24.9°C
🌧️ 2.3 mm
25
29.3°C/24°C
🌧️ 2.2 mm
26
26.8°C/23.5°C
🌧️ 4.7 mm
27
26.8°C/22.4°C
🌧️ 6.4 mm
28
27.6°C/23.3°C
🌧️ 19.3 mm
29
24.7°C/20.6°C
🌧️ 1.6 mm
30
24.2°C/19.8°C
No rain
September 2024☔ 21 days · 194.6 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
29°C/22.9°C
No rain
2
27.8°C/23.3°C
No rain
3
30.2°C/24.4°C
🌧️ 6.2 mm
4
30°C/25.1°C
🌧️ 1.1 mm
5
29.6°C/23.6°C
🌧️ 1 mm
6
29.7°C/25.4°C
🌧️ 4.4 mm
7
29.9°C/25.4°C
🌧️ 6.7 mm
8
29.3°C/25.3°C
🌧️ 2.3 mm
9
30.2°C/25°C
No rain
10
31.3°C/27.1°C
🌧️ 4.6 mm
11
30.3°C/27.1°C
🌧️ 11.9 mm
12
31°C/26.2°C
🌧️ 2.7 mm
13
30.4°C/24.9°C
🌧️ 1.6 mm
14
30.5°C/25.9°C
No rain
15
31.5°C/26.4°C
🌧️ 9.7 mm
16
31°C/26.9°C
🌧️ 5.4 mm
17
29.9°C/26.1°C
🌧️ 11.4 mm
18
33.1°C/26.8°C
No rain
19
31.5°C/26.7°C
🌧️ 23.2 mm
20
29.3°C/26.9°C
🌧️ 21.5 mm
21
29.2°C/25.7°C
🌧️ 23.8 mm
22
25.3°C/22.9°C
🌧️ 44.7 mm
23
25°C/22.3°C
🌧️ 6.8 mm
24
25.6°C/21.8°C
No rain
25
27°C/23.5°C
🌧️ 1.6 mm
26
27.3°C/23.1°C
No rain
27
25.1°C/22.4°C
🌧️ 1.3 mm
28
26.3°C/22.6°C
🌧️ 1.7 mm
29
26°C/22.8°C
No rain
30
26.6°C/22.6°C
No rain
September 2023☔ 15 days · 137.6 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
27.5°C/23.1°C
🌧️ 17.6 mm
2
28.5°C/25.3°C
🌧️ 13 mm
3
30.9°C/25°C
No rain
4
28.7°C/24.4°C
No rain
5
28°C/24.8°C
No rain
6
28.3°C/23.8°C
No rain
7
26.9°C/24.2°C
No rain
8
26.5°C/23.1°C
No rain
9
27.2°C/22.1°C
No rain
10
26.7°C/21.1°C
No rain
11
27.7°C/21.9°C
No rain
12
28.1°C/22.1°C
🌧️ 2.8 mm
13
28.5°C/23.7°C
🌧️ 9.4 mm
14
26.5°C/23.5°C
🌧️ 14.3 mm
15
28.5°C/24.4°C
🌧️ 3.2 mm
16
27.9°C/24.7°C
🌧️ 12.3 mm
17
27.7°C/23.7°C
🌧️ 13.1 mm
18
27.3°C/22.2°C
🌧️ 1.2 mm
19
27.2°C/22.8°C
No rain
20
28.4°C/23.1°C
🌧️ 3 mm
21
25.2°C/22.3°C
🌧️ 11.8 mm
22
23.6°C/21°C
🌧️ 5.2 mm
23
24.5°C/22.2°C
🌧️ 6.9 mm
24
25.1°C/22.6°C
No rain
25
26.9°C/22.3°C
No rain
26
26.9°C/22.7°C
No rain
27
25.9°C/23°C
No rain
28
24.8°C/22.2°C
🌧️ 4.6 mm
29
24.6°C/21.3°C
No rain
30
21.4°C/18°C
🌧️ 15 mm
Historical calendars use Open-Meteo reanalysis data. A rainy day is counted when daily precipitation is at least 1 mm. Conditions at a specific hotel, beach or station can differ.
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Current Jeju weather and 7-day forecast
When departure is close, the latest forecast matters more than long-term averages.
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Forecast data: MET Norway · CC BY 4.0 · cached by Travel Weather Fairy
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Jeju weather in other months
Switch months to compare the seasonal pattern.