Weather: Jeju Island — September
The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.
🌟 Climate Overview
September is an excellent time to visit Jeju Island. Warm weather with highs of 28°C—great for outdoor activities. This is one of the wettest months—waterproof gear is essential. As peak season, expect higher prices and more tourists. Sea temperature of 29°C is perfect for swimming.
Based on weather comfort, crowds, prices, and activity options
28°C
24°C
17days
12.4h
Feels like 31°C / 26°C — humidity makes it feel warmer
275mm
7.9h/day
81%
Very Humid5.6
High18 km/h (gusts 40)
29°C 🏊 Comfortable
Is September a good time to visit Jeju Island?
The weather is near-perfect with ideal temperatures and minimal rain.
Now
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Air Quality
Travel Context
- CrowdsVery Busy
- Travel Costs Shoulder Rates
Daylight
06:18
18:43
Visiting Jeju Island in September: Pros & Cons
Pros
- Comfortable temperatures for sightseeing
- Warm sea perfect for swimming and snorkeling
- One of the best months to visit
Cons
- Frequent rain may disrupt outdoor activities
- Peak season — expect crowds and higher prices
Things to Do in September
Events & Festivals
Recommended for This Weather
Jeju Island Weather by Month
| Month | Avg High | Avg Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition |
|---|---|---|---|---|---|---|---|---|
| Jan | 10°C | 5°C | 9d (59mm) | 5.7h | 70% Humid | 3.3 Moderate | | Good |
| Feb | 10°C | 6°C | 9d (79mm) | 6.3h | 71% Humid | 4.4 Moderate | | Good |
| Mar | 14°C | 9°C | 10d (98mm) | 7.6h | 72% Humid | 6.2 High | | Good |
| Apr | 18°C | 12°C | 8d (93mm) | 8.9h | 72% Humid | 7.8 Very High | | Excellent |
| May | 21°C | 16°C | 9d (129mm) | 9.2h | 77% Humid | 8.2 Very High | | Excellent |
| Jun | 25°C | 21°C | 13d (213mm) | 8h | 85% Very Humid | 7.2 Very High | | Wet |
| Jul | 29°C | 25°C | 18d (254mm) | 8.4h | 87% Very Muggy | 6.8 High | | Wet |
| Aug | 30°C | 26°C | 19d (177mm) | 9.9h | 83% Very Muggy | 7.1 Very High | | Wet |
| Sep Current | 28°C | 24°C | 17d (275mm) | 7.9h | 81% Very Humid | 5.6 High | | Excellent |
| Oct | 22°C | 18°C | 7d (48mm) | 8.2h | 72% Humid | 5.2 High | | Excellent |
| Nov | 17°C | 13°C | 7d (97mm) | 6.9h | 70% Humid | 3.9 Moderate | | Good |
| Dec | 11°C | 7°C | 7d (31mm) | 5.8h | 68% Humid | 3 Moderate | | Good |
Jeju Island
Volcanic island, including waterfalls, Hallasan Mountain hike and Seongsan Sunrise Peak, lava tubes, beaches, and Hallasan crater.
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What to Pack for September
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces. A waterproof jacket and shoes are non-negotiable — showers are frequent.
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📋Essentials
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Frequently Asked Questions
Is September a good time to visit Jeju Island?
Does it get cold at night in Jeju Island in September?
What should I pack for Jeju Island in September?
Does it rain a lot in Jeju Island in September?
Can you swim in Jeju Island in September?
How many hours of daylight are there in Jeju Island in September?
Is September peak season in Jeju Island?
More Jeju Island Guides
Best Time to Visit
Coming soon
Things to Do
Coming soon
Where to Stay
Best neighborhoods and hotel recommendations
Cost & Budget
Daily costs, money-saving tips, and budget breakdown
Itineraries
Coming soon
Overview
Complete travel guide for Jeju Island: top things to do, itineraries, and typical costs.