Jeju Island in August
In August, Jeju Island averages 29°C (84°F) during the day and 25°C (77°F) at night, with frequent rain — about 18 days of the month see precipitation (269 mm total).
High seasonConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
August offers comfortable temperatures in Jeju Island, with some rain to plan around.
How August compares to the rest of the year in Jeju Island
August is one of the warmest months in Jeju Island (1st of 12) and one of the wettest months (2nd of 12). Daytime temperature runs 11°C above the annual average (18°C). August runs 1°C warmer than July (28°C) and cools 4°C in September (25°C).
August sunrise & sunset in Jeju Island
Times shown for Jeju Island local time (Asia/Seoul), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in Jeju Island — August
Golden-hour and blue-hour windows for the 15th of August, in Jeju Island's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Jeju Island in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (High season) and Jeju Island's popularity.
Crowds & pricing — August in Jeju Island
This is a busy month in Jeju Island — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: Northern Hemisphere summer holidays
Sun & mosquito risk — August in Jeju Island
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Jeju Island in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 8°C / 46°F | 3°C / 38°F | 90 mm | 11 | — |
| February | 8°C / 47°F | 4°C / 38°F | 73 mm | 10 | — |
| March | 13°C / 55°F | 7°C / 45°F | 112 mm | 10 | — |
| April | 17°C / 62°F | 11°C / 52°F | 130 mm | 10 | — |
| May | 21°C / 71°F | 16°C / 60°F | 147 mm | 10 | — |
| June | 24°C / 76°F | 20°C / 67°F | 206 mm | 14 | — |
| July | 28°C / 83°F | 24°C / 75°F | 253 mm | 18 | — |
| August | 29°C / 84°F | 25°C / 77°F | 269 mm | 18 | — |
| September | 25°C / 77°F | 22°C / 71°F | 359 mm | 17 | — |
| October | 20°C / 69°F | 16°C / 61°F | 152 mm | 10 | — |
| November | 15°C / 60°F | 11°C / 51°F | 88 mm | 11 | — |
| December | 10°C / 49°F | 5°C / 42°F | 85 mm | 14 | — |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for Jeju Island in August →
Frequently asked questions
How hot is Jeju Island in August?
In August, Jeju Island averages a high of 29°C (84°F) and a low of 25°C (77°F) — generally warm.
Does it rain a lot in Jeju Island in August?
August is quite rainy in Jeju Island, with about 18 rainy days on average.
Is August a good time to visit Jeju Island?
August is warm but on the rainy side. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Jeju Island in August?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full August packing list for Jeju Island for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.