Climate averages 1991–2020
Sejong weather
in April.
A mild, moderately wet month: the 7th warmest and the 7th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Sejong: daytime highs average 18.1°C and nights cool to about 6.4°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 78 mm of rain on roughly 7 days, which makes April a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 06 min on an average April day.
The nearest other city in this atlas is Cheongju-si (18 km away). In April its highs average 18.2°C, about as warm as Sejong, with 79 mm of rain.
Among the 79 cities listed in South Korea, Sejong ranks joint 14th of 79 for the warmest April highs and joint 23rd of 79 for the driest April (rainfall, lowest first). The mean April high of those 79 cities is 16.9°C; Sejong is 1.2°C warmer than that mean.
From April to May, average highs rise by 5.5°C to 23.6°C, and monthly rainfall rises from 78 mm to 86 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sejong climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.9°C-4.6°C | -4.6°C | 22 | 4.3 | 10.010 h |
| February | 5.7°C-3.2°C | -3.2°C | 31 | 4.4 | 10.811 h |
| March | 11.3°C0.6°C | 0.6°C | 49 | 6.7 | 11.912 h |
| April, selected | 18.1°C6.4°C | 6.4°C | 78 | 7.4 | 13.113 h |
| May | 23.6°C12.3°C | 12.3°C | 86 | 7.5 | 14.114 h |
| June | 27.8°C17.8°C | 17.8°C | 122 | 8.5 | 14.615 h |
| July | 28.9°C21.7°C | 21.7°C | 256 | 16.1 | 14.414 h |
| August | 29.3°C22.3°C | 22.3°C | 226 | 15.0 | 13.614 h |
| September | 25.2°C16.9°C | 16.9°C | 143 | 8.5 | 12.412 h |
| October | 19.4°C9.9°C | 9.9°C | 58 | 4.8 | 11.311 h |
| November | 11.9°C3.0°C | 3.0°C | 43 | 5.9 | 10.310 h |
| December | 4.8°C-2.9°C | -2.9°C | 23 | 4.5 | 9.710 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Cheongju-si in AprilSouth Korea · 18 kmHigh 18.2°C · Low 6.5°C · 79 mm rain
- Gongju in AprilSouth Korea · 21 kmHigh 18.2°C · Low 6.8°C · 79 mm rain
- Cheonan in AprilSouth Korea · 27 kmHigh 17.9°C · Low 6.3°C · 77 mm rain
- Daejeon in AprilSouth Korea · 28 kmHigh 18.2°C · Low 6.6°C · 78 mm rain
- Asan in AprilSouth Korea · 33 kmHigh 17.4°C · Low 6.1°C · 71 mm rain
- Pyeongtaek in AprilSouth Korea · 48 kmHigh 17.3°C · Low 6.0°C · 68 mm rain
- Hongseong in AprilSouth Korea · 56 kmHigh 17.1°C · Low 6.4°C · 77 mm rain
- Osan in AprilSouth Korea · 65 kmHigh 16.8°C · Low 5.7°C · 69 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sejong) is explained once on the Sejong year overview and on the Sources, method and limits page.