Jeju-do weather in August
August is one of the least pleasant months in Jeju-do: highs of 28°C (82°F) and about 261 mm (10.3 in) of rain on average. Nights average 26°C (79°F) and cloud cover 67% (NASA POWER, 2001–2025 averages). The sea averages 30°C (87°F). It is the wettest month of the year and the warmest. Compared with July, it is warmer and about as wet; September brings highs of 25°C (76°F) and 185 mm (7.3 in) of rain.
Figures are long-term averages for Jeju City, the largest city in Jeju-do. See below for other places.
Is August a good time to visit Jeju-do?
least pleasant month Weather score 43/100.
August is one of the least pleasant months for weather in Jeju-do. For better conditions, consider Oct.
Does it rain a lot in Jeju-do in August?
Yes, it is one of the rainy months: about 261 mm (10.3 in) falls in an average August. It is the wettest month of the year.
How warm is Jeju-do in August?
Days average 28°C (82°F) and nights 26°C (79°F).
Jeju-do weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 9°C (48°F) | 6°C (43°F) | 50 mm | 78% | 16°C (60°F) | least pleasant |
| February | 9°C (49°F) | 7°C (44°F) | 66 mm | 74% | 14°C (58°F) | least pleasant |
| March | 11°C (53°F) | 8°C (47°F) | 90 mm | 69% | 14°C (56°F) | least pleasant |
| April | 15°C (58°F) | 12°C (53°F) | 137 mm | 70% | 15°C (59°F) | least pleasant |
| May | 18°C (64°F) | 15°C (60°F) | 141 mm | 73% | 17°C (63°F) | fair |
| June | 22°C (71°F) | 20°C (67°F) | 192 mm | 81% | 22°C (71°F) | fair |
| July | 26°C (78°F) | 24°C (75°F) | 240 mm | 74% | 27°C (80°F) | least pleasant |
| August | 28°C (82°F) | 26°C (79°F) | 261 mm | 67% | 30°C (87°F) | least pleasant |
| September | 25°C (76°F) | 23°C (73°F) | 185 mm | 68% | 29°C (85°F) | fair |
| October | 20°C (69°F) | 18°C (65°F) | 89 mm | 59% | 26°C (79°F) | best |
| November | 16°C (60°F) | 13°C (56°F) | 72 mm | 66% | 22°C (71°F) | fair |
| December | 11°C (52°F) | 8°C (47°F) | 56 mm | 77% | 18°C (65°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months
Weather across Jeju-do in August
Weather can differ a lot within Jeju-do: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Jeju City | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |
| Seogwipo | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |
| Tallang-dong | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |
| Ido-dong | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |
| Seodong | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |
| Ara-dong | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |
| Gaigeturi | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |
| Ora-dong | 28°C (82°F) | 26°C (79°F) | 261 mm | least pleasant |