Sejong weather in October
In October, Sejong sees average daytime highs of 20°C and overnight lows near 10°C, with 58 mm of rain across 4.8 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.
Highs ease over the month, from about 23°C in the first days to 18°C by the end. The sky is clear or mostly clear about 48% of the time in October, and the air most often feels dry.
Daylight stretches from about 11 h 36 min at the start of October to 10 h 30 min by month's end. Set against the rest of the year, October is Sejong's 1st-clearest and 10th-windiest month. For the whole year in context, see Sejong's year-round climate.
- Daytime high
- 20°
- 6th warmest
- Overnight low
- 10°
- 7th coldest
- Rainfall
- 58 mm
- 4.8 wet days
- Daylight
- 11 hours
- 6:44 AM – 5:47 PM
- Cloud cover
- 45%
- 1st clearest
- Wind
- 8 km/h
- 10th windiest
- Solar energy
- 3.75 kWh/m²
- Travel score
- 7.4
- out of 10
Temperature in October
Highs ease over the month, from about 23°C in the first days to 18°C by the end.
A typical October day in Sejong reaches about 20°C in the afternoon and slips back to 10°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°C. Set against its neighbours, October runs about 6°C cooler than September and about 8°C warmer than November.
| 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) | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 17 |
| Avg low (°C) | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 6 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 23 | 13 |
| 2 | 23 | 13 |
| 3 | 23 | 13 |
| 4 | 23 | 13 |
| 5 | 23 | 12 |
| 6 | 23 | 12 |
| 7 | 22 | 12 |
| 8 | 22 | 12 |
| 9 | 22 | 11 |
| 10 | 22 | 11 |
| 11 | 22 | 11 |
| 12 | 21 | 11 |
| 13 | 21 | 10 |
| 14 | 21 | 10 |
| 15 | 21 | 10 |
| 16 | 21 | 10 |
| 17 | 20 | 9 |
| 18 | 20 | 9 |
| 19 | 20 | 9 |
| 20 | 20 | 9 |
| 21 | 20 | 9 |
| 22 | 19 | 8 |
| 23 | 19 | 8 |
| 24 | 19 | 8 |
| 25 | 19 | 8 |
| 26 | 18 | 7 |
| 27 | 18 | 7 |
| 28 | 18 | 7 |
| 29 | 18 | 7 |
| 30 | 17 | 7 |
| 31 | 17 | 6 |
How October really feels in Sejong
Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Sejong weather by month
How October compares with the rest of the year at a glance. October is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 4° / -5° | 22 | 4.3 | 2.2 | 9.8 | 0.0 |
| Feb | 6° / -3° | 30 | 4.3 | 1.5 | 10.6 | 0.7 |
| Mar | 12° / 1° | 49 | 6.7 | 1.1 | 11.7 | 3.6 |
| Apr | 19° / 7° | 79 | 7.4 | 0 | 12.9 | 6.5 |
| May | 24° / 13° | 86 | 7.5 | 0 | 13.9 | 7.2 |
| Jun | 28° / 18° | 122 | 8.5 | 0 | 14.5 | 6.1 |
| Jul | 29° / 22° | 256 | 16.1 | 0 | 14.2 | 4.5 |
| Aug | 30° / 22° | 226 | 15 | 0 | 13.4 | 4.4 |
| Sep | 26° / 17° | 143 | 8.5 | 0 | 12.2 | 6.8 |
| Oct | 20° / 10° | 58 | 4.8 | 0 | 11.1 | 7.4 |
| Nov | 13° / 3° | 43 | 5.9 | 0.2 | 10 | 4.0 |
| Dec | 6° / -3° | 23 | 4.5 | 1.4 | 9.5 | 0.5 |
Cloud cover in October
The sky is clear or mostly clear about 48% of the time in October, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 16% of October, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up 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 (%) | 55 | 56 | 56 | 57 | 58 | 59 | 58 | 59 | 60 | 60 | 62 | 62 | 63 | 64 | 64 | 65 | 66 | 66 | 67 | 68 | 68 | 69 | 69 | 69 | 70 | 70 | 70 | 70 | 70 | 69 | 69 |
| Cloudier (%) | 45 | 44 | 44 | 43 | 42 | 41 | 42 | 41 | 40 | 40 | 38 | 38 | 37 | 36 | 36 | 35 | 34 | 34 | 33 | 32 | 32 | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 31 | 31 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 55 | 45 |
| 2 | 56 | 44 |
| 3 | 56 | 44 |
| 4 | 57 | 43 |
| 5 | 58 | 42 |
| 6 | 59 | 41 |
| 7 | 58 | 42 |
| 8 | 59 | 41 |
| 9 | 60 | 40 |
| 10 | 60 | 40 |
| 11 | 62 | 38 |
| 12 | 62 | 38 |
| 13 | 63 | 37 |
| 14 | 64 | 36 |
| 15 | 64 | 36 |
| 16 | 65 | 35 |
| 17 | 66 | 34 |
| 18 | 66 | 34 |
| 19 | 67 | 33 |
| 20 | 68 | 32 |
| 21 | 68 | 32 |
| 22 | 69 | 31 |
| 23 | 69 | 31 |
| 24 | 69 | 31 |
| 25 | 70 | 30 |
| 26 | 70 | 30 |
| 27 | 70 | 30 |
| 28 | 70 | 30 |
| 29 | 70 | 30 |
| 30 | 69 | 31 |
| 31 | 69 | 31 |
Chance of precipitation in October
Sejong gets around 58 mm of rain over 4.8 wet days in October. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 15% and peaks near 19% on the wettest days.
| 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 (%) | 19 | 18 | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 16 | 16 | 16 | 17 |
| Rain chance (%) | |
|---|---|
| 1 | 19 |
| 2 | 18 |
| 3 | 18 |
| 4 | 18 |
| 5 | 17 |
| 6 | 17 |
| 7 | 16 |
| 8 | 16 |
| 9 | 15 |
| 10 | 15 |
| 11 | 14 |
| 12 | 14 |
| 13 | 14 |
| 14 | 14 |
| 15 | 14 |
| 16 | 14 |
| 17 | 14 |
| 18 | 14 |
| 19 | 14 |
| 20 | 14 |
| 21 | 14 |
| 22 | 14 |
| 23 | 14 |
| 24 | 14 |
| 25 | 15 |
| 26 | 15 |
| 27 | 15 |
| 28 | 16 |
| 29 | 16 |
| 30 | 16 |
| 31 | 17 |
Humidity in October
Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, October lands in the dry band about 83% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 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 (%) | 53 | 56 | 59 | 61 | 63 | 66 | 70 | 72 | 75 | 77 | 80 | 82 | 83 | 85 | 87 | 89 | 90 | 90 | 92 | 93 | 94 | 94 | 95 | 95 | 96 | 97 | 97 | 97 | 98 | 98 | 98 |
| Comfortable (%) | 29 | 28 | 26 | 25 | 24 | 22 | 20 | 19 | 17 | 16 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 8 | 7 | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 |
| Humid (%) | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Muggy (%) | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 53 | 29 | 14 | 4 |
| 2 | 56 | 28 | 13 | 3 |
| 3 | 59 | 26 | 12 | 3 |
| 4 | 61 | 25 | 11 | 3 |
| 5 | 63 | 24 | 10 | 3 |
| 6 | 66 | 22 | 9 | 3 |
| 7 | 70 | 20 | 8 | 2 |
| 8 | 72 | 19 | 7 | 2 |
| 9 | 75 | 17 | 6 | 2 |
| 10 | 77 | 16 | 5 | 2 |
| 11 | 80 | 14 | 5 | 1 |
| 12 | 82 | 13 | 4 | 1 |
| 13 | 83 | 12 | 4 | 1 |
| 14 | 85 | 11 | 3 | 1 |
| 15 | 87 | 10 | 3 | 0 |
| 16 | 89 | 9 | 2 | 0 |
| 17 | 90 | 8 | 2 | 0 |
| 18 | 90 | 8 | 2 | 0 |
| 19 | 92 | 7 | 1 | 0 |
| 20 | 93 | 6 | 1 | 0 |
| 21 | 94 | 5 | 1 | 0 |
| 22 | 94 | 5 | 1 | 0 |
| 23 | 95 | 4 | 1 | 0 |
| 24 | 95 | 4 | 1 | 0 |
| 25 | 96 | 4 | 0 | 0 |
| 26 | 97 | 3 | 0 | 0 |
| 27 | 97 | 3 | 0 | 0 |
| 28 | 97 | 3 | 0 | 0 |
| 29 | 98 | 2 | 0 | 0 |
| 30 | 98 | 2 | 0 | 0 |
| 31 | 98 | 2 | 0 | 0 |
Wind in October
Winds average 8 km/h in October.
Across October, daily wind ranges from about 8 km/h on the calmest days to 8 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) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| 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 | 8 | calm |
| 2 | 8 | calm |
| 3 | 8 | calm |
| 4 | 8 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 8 | calm |
| 22 | 8 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
| 31 | 8 | calm |
Sunrise & sunset in October
Daylight runs from about 11 h 36 min at the start of October to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 66 minutes over October. Sunrise moves from 6:31 AM to 6:59 AM, and sunset from 6:09 PM to 5:30 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) | 11.6 | 11.6 | 11.6 | 11.5 | 11.5 | 11.4 | 11.4 | 11.4 | 11.3 | 11.3 | 11.2 | 11.2 | 11.2 | 11.1 | 11.1 | 11.0 | 11.0 | 11.0 | 10.9 | 10.9 | 10.9 | 10.8 | 10.8 | 10.8 | 10.7 | 10.7 | 10.6 | 10.6 | 10.6 | 10.5 | 10.5 |
| Sunrise (AM) | 6:31 | 6:32 | 6:33 | 6:33 | 6:34 | 6:35 | 6:36 | 6:37 | 6:38 | 6:39 | 6:40 | 6:41 | 6:42 | 6:43 | 6:43 | 6:44 | 6:45 | 6:46 | 6:47 | 6:48 | 6:49 | 6:50 | 6:51 | 6:52 | 6:53 | 6:54 | 6:55 | 6:56 | 6:57 | 6:58 | 6:59 |
| Sunset (PM) | 6:09 | 6:07 | 6:06 | 6:04 | 6:03 | 6:01 | 6:00 | 5:58 | 5:57 | 5:56 | 5:54 | 5:53 | 5:51 | 5:50 | 5:49 | 5:47 | 5:46 | 5:45 | 5:43 | 5:42 | 5:41 | 5:40 | 5:38 | 5:37 | 5:36 | 5:35 | 5:34 | 5:33 | 5:32 | 5:31 | 5:30 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 6:31 | 6:09 |
| 2 | 11.6 | 6:32 | 6:07 |
| 3 | 11.6 | 6:33 | 6:06 |
| 4 | 11.5 | 6:33 | 6:04 |
| 5 | 11.5 | 6:34 | 6:03 |
| 6 | 11.4 | 6:35 | 6:01 |
| 7 | 11.4 | 6:36 | 6:00 |
| 8 | 11.4 | 6:37 | 5:58 |
| 9 | 11.3 | 6:38 | 5:57 |
| 10 | 11.3 | 6:39 | 5:56 |
| 11 | 11.2 | 6:40 | 5:54 |
| 12 | 11.2 | 6:41 | 5:53 |
| 13 | 11.2 | 6:42 | 5:51 |
| 14 | 11.1 | 6:43 | 5:50 |
| 15 | 11.1 | 6:43 | 5:49 |
| 16 | 11.0 | 6:44 | 5:47 |
| 17 | 11.0 | 6:45 | 5:46 |
| 18 | 11.0 | 6:46 | 5:45 |
| 19 | 10.9 | 6:47 | 5:43 |
| 20 | 10.9 | 6:48 | 5:42 |
| 21 | 10.9 | 6:49 | 5:41 |
| 22 | 10.8 | 6:50 | 5:40 |
| 23 | 10.8 | 6:51 | 5:38 |
| 24 | 10.8 | 6:52 | 5:37 |
| 25 | 10.7 | 6:53 | 5:36 |
| 26 | 10.7 | 6:54 | 5:35 |
| 27 | 10.6 | 6:55 | 5:34 |
| 28 | 10.6 | 6:56 | 5:33 |
| 29 | 10.6 | 6:57 | 5:32 |
| 30 | 10.5 | 6:58 | 5:31 |
| 31 | 10.5 | 6:59 | 5:30 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 3.75 kWh/m².
For context, solar energy here swings from a low near 2.3 kWh/m² to a high of 5.89 kWh/m² in May across the year — October's 3.75 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) | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.5 | 3.5 | 3.5 | 3.4 | 3.4 | 3.4 | 3.3 | 3.3 | 3.2 |
| Level | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.0 | Bright |
| 2 | 4.0 | Bright |
| 3 | 4.0 | Bright |
| 4 | 4.0 | Bright |
| 5 | 4.0 | Bright |
| 6 | 4.0 | Moderate |
| 7 | 4.0 | Moderate |
| 8 | 4.0 | Moderate |
| 9 | 3.9 | Moderate |
| 10 | 3.9 | Moderate |
| 11 | 3.9 | Moderate |
| 12 | 3.9 | Moderate |
| 13 | 3.9 | Moderate |
| 14 | 3.8 | Moderate |
| 15 | 3.8 | Moderate |
| 16 | 3.8 | Moderate |
| 17 | 3.7 | Moderate |
| 18 | 3.7 | Moderate |
| 19 | 3.7 | Moderate |
| 20 | 3.6 | Moderate |
| 21 | 3.6 | Moderate |
| 22 | 3.6 | Moderate |
| 23 | 3.5 | Moderate |
| 24 | 3.5 | Moderate |
| 25 | 3.5 | Moderate |
| 26 | 3.4 | Moderate |
| 27 | 3.4 | Moderate |
| 28 | 3.4 | Moderate |
| 29 | 3.3 | Moderate |
| 30 | 3.3 | Moderate |
| 31 | 3.2 | Moderate |
Hazard calendar for Sejong
None of Sejong's seasonal hazards are active in October. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Sejong's rainy season runs June–September, when most of the year's rain falls.
Is October a good time to visit Sejong?
Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
October is one of the better times to visit Sejong for general sightseeing.
What to pack for Sejong in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Sejong sees daytime highs around 20°C and nights near 10°C. Little to plan around — just the basics. About 5 days see rain.
UV index in Sejong in October
Clear-sky midday UV in October peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sejong peaks around August 14 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (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) | 2 | 3 | 5 | 6 | 7 | 7 | 8 | 8 | 8 | 5 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 7 | Very high |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Sejong in October
Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.
Air quality in Sejong is worst in March — around 80 µg/m³ PM2.5 (unhealthy), about 1.8× the cleanest month (July, 45 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) | 69 | 72 | 80 | 65 | 58 | 54 | 45 | 45 | 56 | 67 | 72 | 65 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Poor | Poor | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 69 | Unhealthy |
| Feb | 72 | Unhealthy |
| Mar | 80 | Unhealthy |
| Apr | 65 | Unhealthy |
| May | 58 | Unhealthy |
| Jun | 54 | Poor |
| Jul | 45 | Poor |
| Aug | 45 | Poor |
| Sep | 56 | Unhealthy |
| Oct | 67 | Unhealthy |
| Nov | 72 | Unhealthy |
| Dec | 65 | Unhealthy |
Where is Sejong?
Sejong sits at 36.6°N, 127.3°E, 49 m above sea level, in South Korea. The nearest listed city is Cheongju-si, 18 km away.
Topography around Sejong
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sejong.
Within 3 km, the terrain around Sejong has only modest variations in elevation — a maximum elevation change of 148 m around an average of 39 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 445 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,213 m.
The land around Sejong is covered by cropland (43%), artificial surfaces (28%) and trees (21%) within 3 km, trees (54%) and cropland (22%) within 16 km, and trees (62%) and cropland (23%) 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 Sejong (36.5924°, 127.2922°, elevation 49 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. 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).