Osan weather in August
In August, Osan sees average daytime highs of 29°C and overnight lows near 22°C, with 231 mm of rain across 14 wet days and about 13.4 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.
Highs ease over the month, from about 30°C in the first days to 28°C by the end. The sky is clear or mostly clear about 30% of the time in August, and the air most often feels oppressive.
Daylight stretches from about 13 h 54 min at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Osan's 11th-clearest and 10th-windiest month. For the whole year in context, see Osan's year-round climate.
- Daytime high
- 29°
- 1st warmest
- Overnight low
- 22°
- 12th coldest
- Rainfall
- 231 mm
- 14 wet days
- Daylight
- 13 h 24 min
- 5:53 AM – 7:19 PM
- Cloud cover
- 63%
- 11th clearest
- Wind
- 9 km/h
- 10th windiest
- Solar energy
- 4.37 kWh/m²
- Travel score
- 5.0
- out of 10
Osan is city of Gyeonggi-do, South Korea.
- Density
- 5,584/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 30°C in the first days to 28°C by the end.
A typical August day in Osan reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 32°C. Set against its neighbours, August runs about 1°C warmer than July and about 4°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) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 24 |
| 2 | 30 | 24 |
| 3 | 30 | 24 |
| 4 | 30 | 24 |
| 5 | 30 | 24 |
| 6 | 30 | 24 |
| 7 | 30 | 23 |
| 8 | 30 | 23 |
| 9 | 30 | 23 |
| 10 | 30 | 23 |
| 11 | 30 | 23 |
| 12 | 30 | 23 |
| 13 | 30 | 23 |
| 14 | 30 | 23 |
| 15 | 29 | 23 |
| 16 | 29 | 23 |
| 17 | 29 | 23 |
| 18 | 29 | 22 |
| 19 | 29 | 22 |
| 20 | 29 | 22 |
| 21 | 29 | 22 |
| 22 | 29 | 22 |
| 23 | 29 | 22 |
| 24 | 28 | 22 |
| 25 | 28 | 21 |
| 26 | 28 | 21 |
| 27 | 28 | 21 |
| 28 | 28 | 21 |
| 29 | 28 | 21 |
| 30 | 28 | 20 |
| 31 | 28 | 20 |
How August really feels in Osan
Once humidity and wind are folded in, August averages 18 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.
Osan weather by month
How August compares with the rest of the year at a glance. August is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 2° / -6° | 21 | 3.8 | 2.3 | 9.7 | 0.0 |
| Feb | 5° / -4° | 27 | 4.1 | 1.7 | 10.6 | 0.3 |
| Mar | 11° / 1° | 39 | 6.1 | 1 | 11.7 | 2.9 |
| Apr | 17° / 6° | 69 | 7.1 | 0 | 12.9 | 5.9 |
| May | 23° / 12° | 88 | 7.1 | 0 | 14 | 7.3 |
| Jun | 26° / 18° | 118 | 7.6 | 0 | 14.5 | 6.8 |
| Jul | 28° / 22° | 279 | 15.3 | 0 | 14.3 | 5.1 |
| Aug | 29° / 22° | 231 | 14 | 0 | 13.4 | 5.0 |
| Sep | 26° / 17° | 124 | 7.8 | 0 | 12.3 | 7.0 |
| Oct | 20° / 10° | 55 | 5.2 | 0 | 11 | 7.2 |
| Nov | 12° / 3° | 47 | 7.3 | 0.3 | 10 | 3.5 |
| Dec | 5° / -4° | 23 | 5.1 | 1.6 | 9.5 | 0.2 |
Cloud cover in August
The sky is clear or mostly clear about 30% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 14% of August, with mostly cloudy or overcast conditions the remaining 56%.
| 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 (%) | 44 | 44 | 45 | 46 | 45 | 45 | 45 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 43 | 43 | 43 | 43 | 42 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 44 | 45 | 45 | 45 | 46 |
| Cloudier (%) | 56 | 56 | 55 | 54 | 55 | 55 | 55 | 56 | 56 | 56 | 56 | 56 | 56 | 56 | 57 | 57 | 57 | 57 | 58 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 56 | 55 | 55 | 55 | 54 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 44 | 56 |
| 2 | 44 | 56 |
| 3 | 45 | 55 |
| 4 | 46 | 54 |
| 5 | 45 | 55 |
| 6 | 45 | 55 |
| 7 | 45 | 55 |
| 8 | 44 | 56 |
| 9 | 44 | 56 |
| 10 | 44 | 56 |
| 11 | 44 | 56 |
| 12 | 44 | 56 |
| 13 | 44 | 56 |
| 14 | 44 | 56 |
| 15 | 43 | 57 |
| 16 | 43 | 57 |
| 17 | 43 | 57 |
| 18 | 43 | 57 |
| 19 | 42 | 58 |
| 20 | 42 | 58 |
| 21 | 42 | 58 |
| 22 | 42 | 58 |
| 23 | 42 | 58 |
| 24 | 42 | 58 |
| 25 | 43 | 57 |
| 26 | 43 | 57 |
| 27 | 44 | 56 |
| 28 | 45 | 55 |
| 29 | 45 | 55 |
| 30 | 45 | 55 |
| 31 | 46 | 54 |
Chance of precipitation in August
Osan gets around 231 mm of rain over 14 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 ease 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 (%) | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 46 | 45 | 45 | 44 | 44 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 42 | 42 | 41 | 40 |
| Rain chance (%) | |
|---|---|
| 1 | 48 |
| 2 | 48 |
| 3 | 48 |
| 4 | 48 |
| 5 | 47 |
| 6 | 47 |
| 7 | 47 |
| 8 | 46 |
| 9 | 45 |
| 10 | 45 |
| 11 | 44 |
| 12 | 44 |
| 13 | 43 |
| 14 | 43 |
| 15 | 43 |
| 16 | 43 |
| 17 | 43 |
| 18 | 43 |
| 19 | 43 |
| 20 | 43 |
| 21 | 43 |
| 22 | 43 |
| 23 | 43 |
| 24 | 43 |
| 25 | 43 |
| 26 | 43 |
| 27 | 43 |
| 28 | 42 |
| 29 | 42 |
| 30 | 41 |
| 31 | 40 |
Humidity in August
Most of August feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the oppressive band about 46% of days. Sticky, muggy-or-worse air turns up on roughly 90% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 5 | 5 | 6 | 7 |
| Humid (%) | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 14 | 16 | 17 | 19 | 21 | 22 | 24 |
| Muggy (%) | 13 | 13 | 13 | 13 | 13 | 14 | 15 | 15 | 16 | 18 | 19 | 20 | 21 | 23 | 24 | 26 | 27 | 29 | 30 | 32 | 33 | 34 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 |
| Oppressive (%) | 56 | 55 | 54 | 54 | 54 | 53 | 52 | 52 | 51 | 50 | 50 | 51 | 50 | 49 | 49 | 48 | 47 | 46 | 46 | 45 | 44 | 43 | 42 | 40 | 39 | 37 | 36 | 34 | 32 | 30 | 29 |
| Miserable (%) | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 29 | 28 | 26 | 25 | 23 | 22 | 20 | 18 | 17 | 15 | 14 | 12 | 11 | 9 | 8 | 7 | 6 | 5 | 5 | 4 | 3 | 3 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 13 | 56 | 30 |
| 2 | 0 | 0 | 2 | 13 | 55 | 30 |
| 3 | 0 | 0 | 2 | 13 | 54 | 31 |
| 4 | 0 | 0 | 2 | 13 | 54 | 31 |
| 5 | 0 | 0 | 2 | 13 | 54 | 31 |
| 6 | 0 | 0 | 2 | 14 | 53 | 31 |
| 7 | 0 | 0 | 2 | 15 | 52 | 31 |
| 8 | 0 | 0 | 2 | 15 | 52 | 31 |
| 9 | 0 | 0 | 3 | 16 | 51 | 30 |
| 10 | 0 | 0 | 3 | 18 | 50 | 29 |
| 11 | 0 | 0 | 3 | 19 | 50 | 28 |
| 12 | 0 | 0 | 3 | 20 | 51 | 26 |
| 13 | 0 | 1 | 4 | 21 | 50 | 25 |
| 14 | 0 | 1 | 4 | 23 | 49 | 23 |
| 15 | 0 | 1 | 5 | 24 | 49 | 22 |
| 16 | 0 | 1 | 5 | 26 | 48 | 20 |
| 17 | 0 | 1 | 6 | 27 | 47 | 18 |
| 18 | 0 | 1 | 6 | 29 | 46 | 17 |
| 19 | 0 | 1 | 7 | 30 | 46 | 15 |
| 20 | 0 | 2 | 8 | 32 | 45 | 14 |
| 21 | 0 | 2 | 9 | 33 | 44 | 12 |
| 22 | 0 | 2 | 10 | 34 | 43 | 11 |
| 23 | 0 | 2 | 11 | 36 | 42 | 9 |
| 24 | 1 | 3 | 13 | 36 | 40 | 8 |
| 25 | 1 | 3 | 14 | 36 | 39 | 7 |
| 26 | 1 | 3 | 16 | 37 | 37 | 6 |
| 27 | 1 | 4 | 17 | 37 | 36 | 5 |
| 28 | 1 | 5 | 19 | 37 | 34 | 5 |
| 29 | 1 | 5 | 21 | 37 | 32 | 4 |
| 30 | 1 | 6 | 22 | 37 | 30 | 3 |
| 31 | 1 | 7 | 24 | 37 | 29 | 3 |
Wind in August
Winds average 9 km/h in August.
Across August, daily wind ranges from about 9 km/h on the calmest days to 9 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) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
| 31 | 9 | calm |
Sunrise & sunset in August
Daylight runs from about 13 h 54 min at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 60 minutes over August. Sunrise moves from 5:40 AM to 6:06 AM, and sunset from 7:36 PM to 6:58 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) | 13.9 | 13.9 | 13.9 | 13.8 | 13.8 | 13.8 | 13.7 | 13.7 | 13.7 | 13.6 | 13.6 | 13.6 | 13.5 | 13.5 | 13.5 | 13.4 | 13.4 | 13.4 | 13.3 | 13.3 | 13.3 | 13.2 | 13.2 | 13.1 | 13.1 | 13.1 | 13.0 | 13.0 | 13.0 | 12.9 | 12.9 |
| Sunrise (AM) | 5:40 | 5:41 | 5:42 | 5:42 | 5:43 | 5:44 | 5:45 | 5:46 | 5:47 | 5:48 | 5:48 | 5:49 | 5:50 | 5:51 | 5:52 | 5:53 | 5:54 | 5:54 | 5:55 | 5:56 | 5:57 | 5:58 | 5:59 | 6:00 | 6:00 | 6:01 | 6:02 | 6:03 | 6:04 | 6:05 | 6:06 |
| Sunset (PM) | 7:36 | 7:35 | 7:34 | 7:33 | 7:32 | 7:31 | 7:30 | 7:28 | 7:27 | 7:26 | 7:25 | 7:24 | 7:23 | 7:21 | 7:20 | 7:19 | 7:18 | 7:16 | 7:15 | 7:14 | 7:12 | 7:11 | 7:10 | 7:08 | 7:07 | 7:05 | 7:04 | 7:02 | 7:01 | 6:59 | 6:58 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.9 | 5:40 | 7:36 |
| 2 | 13.9 | 5:41 | 7:35 |
| 3 | 13.9 | 5:42 | 7:34 |
| 4 | 13.8 | 5:42 | 7:33 |
| 5 | 13.8 | 5:43 | 7:32 |
| 6 | 13.8 | 5:44 | 7:31 |
| 7 | 13.7 | 5:45 | 7:30 |
| 8 | 13.7 | 5:46 | 7:28 |
| 9 | 13.7 | 5:47 | 7:27 |
| 10 | 13.6 | 5:48 | 7:26 |
| 11 | 13.6 | 5:48 | 7:25 |
| 12 | 13.6 | 5:49 | 7:24 |
| 13 | 13.5 | 5:50 | 7:23 |
| 14 | 13.5 | 5:51 | 7:21 |
| 15 | 13.5 | 5:52 | 7:20 |
| 16 | 13.4 | 5:53 | 7:19 |
| 17 | 13.4 | 5:54 | 7:18 |
| 18 | 13.4 | 5:54 | 7:16 |
| 19 | 13.3 | 5:55 | 7:15 |
| 20 | 13.3 | 5:56 | 7:14 |
| 21 | 13.3 | 5:57 | 7:12 |
| 22 | 13.2 | 5:58 | 7:11 |
| 23 | 13.2 | 5:59 | 7:10 |
| 24 | 13.1 | 6:00 | 7:08 |
| 25 | 13.1 | 6:00 | 7:07 |
| 26 | 13.1 | 6:01 | 7:05 |
| 27 | 13.0 | 6:02 | 7:04 |
| 28 | 13.0 | 6:03 | 7:02 |
| 29 | 13.0 | 6:04 | 7:01 |
| 30 | 12.9 | 6:05 | 6:59 |
| 31 | 12.9 | 6:06 | 6:58 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 4.37 kWh/m².
For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 5.85 kWh/m² in May across the year — August's 4.37 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) | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 |
| 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 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.5 | Bright |
| 4 | 4.5 | Bright |
| 5 | 4.5 | Bright |
| 6 | 4.5 | Bright |
| 7 | 4.5 | Bright |
| 8 | 4.5 | Bright |
| 9 | 4.5 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.5 | Bright |
| 12 | 4.5 | Bright |
| 13 | 4.4 | Bright |
| 14 | 4.4 | Bright |
| 15 | 4.4 | Bright |
| 16 | 4.4 | Bright |
| 17 | 4.4 | Bright |
| 18 | 4.3 | Bright |
| 19 | 4.3 | Bright |
| 20 | 4.3 | Bright |
| 21 | 4.3 | Bright |
| 22 | 4.3 | Bright |
| 23 | 4.3 | Bright |
| 24 | 4.3 | Bright |
| 25 | 4.3 | Bright |
| 26 | 4.3 | Bright |
| 27 | 4.3 | Bright |
| 28 | 4.3 | Bright |
| 29 | 4.3 | Bright |
| 30 | 4.3 | Bright |
| 31 | 4.3 | Bright |
Hazard calendar for Osan
In August, Osan sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Osan sits in the Pacific typhoon belt; the season peaks July–October.
Osan's rainy season runs July–August, when most of the year's rain falls.
Is August a good time to visit Osan?
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 Osan for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Osan in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Osan sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. About 14 days see rain.
Sea temperature near Osan in August
The nearest coast averages about 23°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 40 km away) is warmest in August at about 23°C and coldest in February near 4°C.
It's comfortable for a long swim from Jul 12 to Oct 14 — about 3.1 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 4 | 5 | 8 | 12 | 16 | 21 | 23 | 23 | 20 | 15 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 4 | Bracing |
| Mar | 5 | Bracing |
| Apr | 8 | Bracing |
| May | 12 | Bracing |
| Jun | 16 | Cool |
| Jul | 21 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 23 | Refreshing |
| Oct | 20 | Cool |
| Nov | 15 | Cool |
| Dec | 10 | Bracing |
UV index in Osan 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 Osan peaks around August 11 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 6 | 6 | 7 | 8 | 8 | 7 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | High | High | Very high | Very high | Very high | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 7 | Very high |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Osan 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 Osan is worst in March — around 160 µg/m³ PM2.5 (very unhealthy), about 2.0× the cleanest month (August, 81 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) | 145 | 149 | 160 | 127 | 111 | 98 | 88 | 81 | 110 | 132 | 142 | 133 |
| Level | Unhealthy | Unhealthy | Very unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 145 | Unhealthy |
| Feb | 149 | Unhealthy |
| Mar | 160 | Very unhealthy |
| Apr | 127 | Unhealthy |
| May | 111 | Unhealthy |
| Jun | 98 | Unhealthy |
| Jul | 88 | Unhealthy |
| Aug | 81 | Unhealthy |
| Sep | 110 | Unhealthy |
| Oct | 132 | Unhealthy |
| Nov | 142 | Unhealthy |
| Dec | 133 | Unhealthy |
Where is Osan?
Osan sits at 37.2°N, 127.1°E, 22 m above sea level, in South Korea. The nearest listed city is Suwon, 16 km away.
Topography around Osan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Osan.
Within 3 km, the terrain around Osan has only modest variations in elevation — a maximum elevation change of 138 m around an average of 39 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 496 m; within 80 km, large variations in elevation — a maximum elevation change of 1,126 m.
The land around Osan is covered by artificial surfaces (48%) and trees (25%) within 3 km, trees (39%) and artificial surfaces (32%) within 16 km, and trees (49%) 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 Osan (37.1522°, 127.0706°, elevation 22 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).