What to expect in Jeju Island in August
August is a strong choice for Jeju Island: 30° / 24°, with the biggest crowds of the year and prices close to the yearly average.
Jeju Island weather in August
Typical conditions in Jeju Island during August, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 30°C 86°F |
|---|---|
| Average low | 24°C 75°F |
| Rainfall | Wet 75/100 |
| Total rainfall | 272 mm10.7 in |
| Rainy days | 13 |
| Sea temperature | 27°C 80°F |
| Daylight | 13 h 23 min |
| How it feels | Hot — midday shade matters |
Average highs sit around 30°C with lows near 24°C. Expect a fair amount of rain, so plan indoor backups.
Crowds & demand
Crowd levels are High for Jeju Island — the biggest crowds of the year.
Prices & value
This month counts as shoulder season: prices close to the yearly average.
What to pack
Lightweight, breathable clothes, strong sun protection and a refillable bottle — highs near 30°C make midday heat the main constraint. Add a compact rain shell and shoes you do not mind soaking; this is one of the wetter months.
What it costs
Costs in August sit around the yearly average for Jeju Island — neither a bargain nor a squeeze. Booking a few weeks out is usually enough.
Who this month suits
- Travellers who want the most reliable weather
- Anyone travelling on a budget
- Families tied to school holidays
Events & what’s on
No major festivals fall in August, so the destination feels like its everyday self.
Jeju Island in August compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| June | 24° / 18° | Moderate | $$ | 64 |
| July | 28° / 23° | High | $$ | 45 |
| August · This month | 30° / 24° | High | $$ | 41 |
| September | 26° / 20° | Moderate | $$ | 62 |
| October | 21° / 14° | Moderate | $$ | 59 |
These months score higher for Jeju Island on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in August
If the destination is negotiable but the month is not, these places are at their best in August.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
