Jeju weather in August
In August, Jeju sees average daytime highs of 27°C and overnight lows near 25°C, with 168 mm of rain across 13.7 wet days and about 13.2 hours of daylight. It is the 1st-warmest and 3rd-wettest month of the year here.
Highs ease over the month, from about 28°C in the first days to 26°C by the end. The sky is clear or mostly clear about 33% of the time in August, and the air most often feels miserable.
Daylight stretches from about 13 h 42 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Jeju's 6th-clearest and 9th-windiest month. For the whole year in context, see Jeju's year-round climate.
- Daytime high
- 27°
- 1st warmest
- Overnight low
- 25°
- 12th coldest
- Rainfall
- 168 mm
- 13.7 wet days
- Daylight
- 13 h 18 min
- 6:00 AM – 7:16 PM
- Cloud cover
- 61%
- 6th clearest
- Wind
- 15 km/h
- 9th windiest
- Solar energy
- 4.84 kWh/m²
- Travel score
- 5.9
- out of 10
Jeju is city in South Korea.
- Density
- 500/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in August
Highs ease over the month, from about 28°C in the first days to 26°C by the end.
A typical August day in Jeju reaches about 27°C in the afternoon and slips back to 25°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°C. Set against its neighbours, August runs about 1°C warmer than July and about 3°C warmer than September.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 28 | 25 |
| 2 | 28 | 25 |
| 3 | 28 | 25 |
| 4 | 28 | 25 |
| 5 | 28 | 25 |
| 6 | 28 | 25 |
| 7 | 28 | 26 |
| 8 | 28 | 26 |
| 9 | 28 | 25 |
| 10 | 28 | 25 |
| 11 | 28 | 25 |
| 12 | 28 | 25 |
| 13 | 28 | 25 |
| 14 | 28 | 25 |
| 15 | 28 | 25 |
| 16 | 28 | 25 |
| 17 | 28 | 25 |
| 18 | 28 | 25 |
| 19 | 27 | 25 |
| 20 | 27 | 25 |
| 21 | 27 | 25 |
| 22 | 27 | 25 |
| 23 | 27 | 25 |
| 24 | 27 | 25 |
| 25 | 27 | 25 |
| 26 | 27 | 24 |
| 27 | 27 | 24 |
| 28 | 27 | 24 |
| 29 | 26 | 24 |
| 30 | 26 | 24 |
| 31 | 26 | 24 |
How August really feels in Jeju
Once humidity and wind are folded in, August averages 11 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Jeju weather by month
How August compares with the rest of the year at a glance. August is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 8° / 5° | 73 | 11.6 | 2.6 | 10 | 1.1 |
| Feb | 8° / 5° | 64 | 9.3 | 1.7 | 10.8 | 1.5 |
| Mar | 11° / 7° | 95 | 10.3 | 0.4 | 11.7 | 2.9 |
| Apr | 15° / 11° | 102 | 8.9 | 0 | 12.8 | 4.6 |
| May | 19° / 15° | 109 | 8.8 | 0 | 13.7 | 6.2 |
| Jun | 22° / 19° | 189 | 11.6 | 0 | 14.2 | 6.1 |
| Jul | 26° / 24° | 184 | 12.1 | 0 | 14 | 6.2 |
| Aug | 27° / 25° | 168 | 13.7 | 0 | 13.2 | 5.9 |
| Sep | 24° / 22° | 165 | 11.1 | 0 | 12.2 | 6.7 |
| Oct | 20° / 17° | 79 | 6.8 | 0 | 11.2 | 6.9 |
| Nov | 15° / 12° | 70 | 8.8 | 0 | 10.3 | 4.7 |
| Dec | 10° / 7° | 68 | 11 | 1.1 | 9.8 | 2.3 |
Cloud cover in August
The sky is clear or mostly clear about 33% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 15% of August, with mostly cloudy or overcast conditions the remaining 53%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 53 | 53 | 52 | 52 | 51 | 50 | 49 | 49 | 49 | 48 | 47 | 46 | 47 | 47 | 46 | 46 | 46 | 46 | 47 | 47 | 47 | 45 | 46 | 46 | 45 | 44 | 45 | 45 | 44 | 44 | 45 |
| Cloudier (%) | 47 | 47 | 48 | 48 | 49 | 50 | 51 | 51 | 51 | 52 | 53 | 54 | 53 | 53 | 54 | 54 | 54 | 54 | 53 | 53 | 53 | 55 | 54 | 54 | 55 | 56 | 55 | 55 | 56 | 56 | 55 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 53 | 47 |
| 2 | 53 | 47 |
| 3 | 52 | 48 |
| 4 | 52 | 48 |
| 5 | 51 | 49 |
| 6 | 50 | 50 |
| 7 | 49 | 51 |
| 8 | 49 | 51 |
| 9 | 49 | 51 |
| 10 | 48 | 52 |
| 11 | 47 | 53 |
| 12 | 46 | 54 |
| 13 | 47 | 53 |
| 14 | 47 | 53 |
| 15 | 46 | 54 |
| 16 | 46 | 54 |
| 17 | 46 | 54 |
| 18 | 46 | 54 |
| 19 | 47 | 53 |
| 20 | 47 | 53 |
| 21 | 47 | 53 |
| 22 | 45 | 55 |
| 23 | 46 | 54 |
| 24 | 46 | 54 |
| 25 | 45 | 55 |
| 26 | 44 | 56 |
| 27 | 45 | 55 |
| 28 | 45 | 55 |
| 29 | 44 | 56 |
| 30 | 44 | 56 |
| 31 | 45 | 55 |
Chance of precipitation in August
Jeju gets around 168 mm of rain over 13.7 wet days in August. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 44% and peaks near 48% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 43 | 44 | 45 | 46 | 47 | 47 | 48 | 48 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 47 | 46 | 46 | 45 | 44 | 44 |
| Rain chance (%) | |
|---|---|
| 1 | 34 |
| 2 | 35 |
| 3 | 36 |
| 4 | 37 |
| 5 | 38 |
| 6 | 39 |
| 7 | 40 |
| 8 | 41 |
| 9 | 42 |
| 10 | 43 |
| 11 | 43 |
| 12 | 44 |
| 13 | 45 |
| 14 | 46 |
| 15 | 47 |
| 16 | 47 |
| 17 | 48 |
| 18 | 48 |
| 19 | 48 |
| 20 | 48 |
| 21 | 48 |
| 22 | 48 |
| 23 | 47 |
| 24 | 47 |
| 25 | 47 |
| 26 | 47 |
| 27 | 46 |
| 28 | 46 |
| 29 | 45 |
| 30 | 44 |
| 31 | 44 |
Humidity in August
Most of August feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the miserable band about 47% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 6 | 7 | 8 |
| Muggy (%) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 10 | 11 | 13 | 14 | 16 | 17 | 19 | 21 | 23 | 25 | 27 | 30 | 32 | 34 |
| Oppressive (%) | 31 | 30 | 29 | 29 | 29 | 30 | 30 | 31 | 33 | 34 | 36 | 37 | 39 | 41 | 42 | 43 | 44 | 45 | 46 | 46 | 46 | 46 | 45 | 45 | 44 | 43 | 42 | 41 | 39 | 38 | 37 |
| Miserable (%) | 64 | 65 | 66 | 66 | 66 | 65 | 65 | 64 | 62 | 60 | 58 | 57 | 54 | 52 | 50 | 48 | 46 | 44 | 42 | 40 | 39 | 37 | 35 | 34 | 32 | 30 | 29 | 27 | 25 | 24 | 22 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 0 | 5 | 31 | 64 |
| 2 | 0 | 5 | 30 | 65 |
| 3 | 0 | 5 | 29 | 66 |
| 4 | 0 | 5 | 29 | 66 |
| 5 | 0 | 5 | 29 | 66 |
| 6 | 0 | 5 | 30 | 65 |
| 7 | 0 | 5 | 30 | 65 |
| 8 | 0 | 5 | 31 | 64 |
| 9 | 0 | 5 | 33 | 62 |
| 10 | 0 | 6 | 34 | 60 |
| 11 | 0 | 6 | 36 | 58 |
| 12 | 0 | 6 | 37 | 57 |
| 13 | 0 | 7 | 39 | 54 |
| 14 | 0 | 7 | 41 | 52 |
| 15 | 0 | 8 | 42 | 50 |
| 16 | 0 | 8 | 43 | 48 |
| 17 | 0 | 9 | 44 | 46 |
| 18 | 0 | 10 | 45 | 44 |
| 19 | 1 | 11 | 46 | 42 |
| 20 | 1 | 13 | 46 | 40 |
| 21 | 1 | 14 | 46 | 39 |
| 22 | 2 | 16 | 46 | 37 |
| 23 | 2 | 17 | 45 | 35 |
| 24 | 3 | 19 | 45 | 34 |
| 25 | 3 | 21 | 44 | 32 |
| 26 | 4 | 23 | 43 | 30 |
| 27 | 4 | 25 | 42 | 29 |
| 28 | 5 | 27 | 41 | 27 |
| 29 | 6 | 30 | 39 | 25 |
| 30 | 7 | 32 | 38 | 24 |
| 31 | 8 | 34 | 37 | 22 |
Wind in August
Winds average 15 km/h in August.
Across August, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 16 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 14 | light breeze |
| 2 | 14 | light breeze |
| 3 | 14 | light breeze |
| 4 | 14 | light breeze |
| 5 | 14 | light breeze |
| 6 | 14 | light breeze |
| 7 | 14 | light breeze |
| 8 | 14 | light breeze |
| 9 | 14 | light breeze |
| 10 | 14 | light breeze |
| 11 | 14 | light breeze |
| 12 | 14 | light breeze |
| 13 | 14 | light breeze |
| 14 | 14 | light breeze |
| 15 | 14 | light breeze |
| 16 | 14 | light breeze |
| 17 | 14 | light breeze |
| 18 | 14 | light breeze |
| 19 | 14 | light breeze |
| 20 | 14 | light breeze |
| 21 | 14 | light breeze |
| 22 | 14 | light breeze |
| 23 | 15 | light breeze |
| 24 | 15 | light breeze |
| 25 | 15 | light breeze |
| 26 | 15 | light breeze |
| 27 | 15 | light breeze |
| 28 | 15 | light breeze |
| 29 | 15 | light breeze |
| 30 | 15 | light breeze |
| 31 | 16 | light breeze |
Sunrise & sunset in August
Daylight runs from about 13 h 42 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 54 minutes over August. Sunrise moves from 5:50 AM to 6:11 AM, and sunset from 7:30 PM to 6:57 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.7 | 13.7 | 13.6 | 13.6 | 13.6 | 13.5 | 13.5 | 13.5 | 13.5 | 13.4 | 13.4 | 13.4 | 13.3 | 13.3 | 13.3 | 13.3 | 13.2 | 13.2 | 13.2 | 13.1 | 13.1 | 13.1 | 13.0 | 13.0 | 13.0 | 12.9 | 12.9 | 12.9 | 12.8 | 12.8 | 12.8 |
| Sunrise (AM) | 5:50 | 5:50 | 5:51 | 5:52 | 5:52 | 5:53 | 5:54 | 5:55 | 5:55 | 5:56 | 5:57 | 5:58 | 5:58 | 5:59 | 6:00 | 6:00 | 6:01 | 6:02 | 6:03 | 6:03 | 6:04 | 6:05 | 6:05 | 6:06 | 6:07 | 6:08 | 6:08 | 6:09 | 6:10 | 6:10 | 6:11 |
| Sunset (PM) | 7:30 | 7:30 | 7:29 | 7:28 | 7:27 | 7:26 | 7:25 | 7:24 | 7:23 | 7:22 | 7:21 | 7:20 | 7:19 | 7:18 | 7:17 | 7:16 | 7:14 | 7:13 | 7:12 | 7:11 | 7:10 | 7:09 | 7:07 | 7:06 | 7:05 | 7:03 | 7:02 | 7:01 | 7:00 | 6:58 | 6:57 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.7 | 5:50 | 7:30 |
| 2 | 13.7 | 5:50 | 7:30 |
| 3 | 13.6 | 5:51 | 7:29 |
| 4 | 13.6 | 5:52 | 7:28 |
| 5 | 13.6 | 5:52 | 7:27 |
| 6 | 13.5 | 5:53 | 7:26 |
| 7 | 13.5 | 5:54 | 7:25 |
| 8 | 13.5 | 5:55 | 7:24 |
| 9 | 13.5 | 5:55 | 7:23 |
| 10 | 13.4 | 5:56 | 7:22 |
| 11 | 13.4 | 5:57 | 7:21 |
| 12 | 13.4 | 5:58 | 7:20 |
| 13 | 13.3 | 5:58 | 7:19 |
| 14 | 13.3 | 5:59 | 7:18 |
| 15 | 13.3 | 6:00 | 7:17 |
| 16 | 13.3 | 6:00 | 7:16 |
| 17 | 13.2 | 6:01 | 7:14 |
| 18 | 13.2 | 6:02 | 7:13 |
| 19 | 13.2 | 6:03 | 7:12 |
| 20 | 13.1 | 6:03 | 7:11 |
| 21 | 13.1 | 6:04 | 7:10 |
| 22 | 13.1 | 6:05 | 7:09 |
| 23 | 13.0 | 6:05 | 7:07 |
| 24 | 13.0 | 6:06 | 7:06 |
| 25 | 13.0 | 6:07 | 7:05 |
| 26 | 12.9 | 6:08 | 7:03 |
| 27 | 12.9 | 6:08 | 7:02 |
| 28 | 12.9 | 6:09 | 7:01 |
| 29 | 12.8 | 6:10 | 7:00 |
| 30 | 12.8 | 6:10 | 6:58 |
| 31 | 12.8 | 6:11 | 6:57 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 4.84 kWh/m².
For context, solar energy here swings from a low near 2.09 kWh/m² to a high of 5.73 kWh/m² in May across the year — August's 4.84 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.3 | 5.3 | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.3 | Bright |
| 2 | 5.3 | Bright |
| 3 | 5.2 | Bright |
| 4 | 5.2 | Bright |
| 5 | 5.2 | Bright |
| 6 | 5.1 | Bright |
| 7 | 5.1 | Bright |
| 8 | 5.1 | Bright |
| 9 | 5.0 | Bright |
| 10 | 5.0 | Bright |
| 11 | 5.0 | Bright |
| 12 | 4.9 | Bright |
| 13 | 4.9 | Bright |
| 14 | 4.9 | Bright |
| 15 | 4.8 | Bright |
| 16 | 4.8 | Bright |
| 17 | 4.8 | Bright |
| 18 | 4.8 | Bright |
| 19 | 4.7 | Bright |
| 20 | 4.7 | Bright |
| 21 | 4.7 | Bright |
| 22 | 4.7 | Bright |
| 23 | 4.6 | Bright |
| 24 | 4.6 | Bright |
| 25 | 4.6 | Bright |
| 26 | 4.6 | Bright |
| 27 | 4.6 | Bright |
| 28 | 4.5 | Bright |
| 29 | 4.5 | Bright |
| 30 | 4.5 | Bright |
| 31 | 4.5 | Bright |
Hazard calendar for Jeju
In August, Jeju sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Jeju sits in the Pacific typhoon belt; the season peaks July–October.
Jeju's rainy season runs March–September, when most of the year's rain falls.
Is August a good time to visit Jeju?
Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
August is a reasonable time to visit Jeju for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Jeju in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Jeju sees daytime highs around 27°C and nights near 25°C. Pack light clothes. Worth having: rain gear and sun protection. About 14 days see rain.
Sea temperature near Jeju in August
The nearest coast averages about 27°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 16 km away) is warmest in August at about 27°C and coldest in March near 14°C.
It's comfortable for a long swim from Jun 18 to Nov 4 — about 4.6 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 14 | 14 | 14 | 16 | 20 | 24 | 27 | 25 | 22 | 19 | 17 |
| Comfort | Cool | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Cool |
| Feb | 14 | Bracing |
| Mar | 14 | Bracing |
| Apr | 14 | Bracing |
| May | 16 | Cool |
| Jun | 20 | Cool |
| Jul | 24 | Refreshing |
| Aug | 27 | Warm |
| Sep | 25 | Warm |
| Oct | 22 | Refreshing |
| Nov | 19 | Cool |
| Dec | 17 | Cool |
UV index in Jeju in August
Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Jeju peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 6 | 7 | 8 | 8 | 10 | 8 | 9 | 6 | 4 | 3 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 6 | High |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 10 | Very high |
| Aug | 8 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Jeju in August
Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.
Air quality in Jeju is worst in March — around 30 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (July, 13 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 21 | 25 | 30 | 29 | 23 | 18 | 13 | 13 | 14 | 15 | 18 | 16 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 21 | Moderate |
| Feb | 25 | Moderate |
| Mar | 30 | Moderate |
| Apr | 29 | Moderate |
| May | 23 | Moderate |
| Jun | 18 | Moderate |
| Jul | 13 | Moderate |
| Aug | 13 | Moderate |
| Sep | 14 | Moderate |
| Oct | 15 | Moderate |
| Nov | 18 | Moderate |
| Dec | 16 | Moderate |
Where is Jeju?
Jeju sits at 33.5°N, 126.5°E, 19 m above sea level, in South Korea. The nearest listed city is Ido-dong, 1.0 km away.
Topography around Jeju
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Jeju.
Within 3 km, the terrain around Jeju has only modest variations in elevation — a maximum elevation change of 141 m around an average of 43 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,836 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,915 m.
The land around Jeju is covered by artificial surfaces (51%) and water (29%) within 3 km, water (47%) and trees (36%) within 16 km, and water (88%) within 80 km.
South Korea travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 220 V · 60 Hz
- Prices
- ≈ 57% of US
- price level, 2025
- GDP per capita
- $36,227
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.5
- per 100k, 2023
- Road deaths
- 8.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 522
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Jeju (33.5097°, 126.5219°, elevation 19 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).