Daejeon weather by month
Daejeon runs from about 0°C in January to 28°C in August, with July the wettest month at 384 mm.
warmest month
August
28°C
coolest month
January
0°C
wettest month
July
384 mm
worst air month
March
38 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 0°C | 30 mm | 207 h | 22 |
| February | 4°C | 90 mm | 157 h | 26 |
| March | 6°C | 59 mm | 259 h | 38 |
| April | 15°C | 48 mm | 235 h | 27 |
| May | 18°C | 135 mm | 309 h | 24 |
| June | 24°C | 100 mm | 308 h | 20 |
| July | 26°C | 384 mm | 241 h | 15 |
| August | 28°C | 65 mm | 360 h | 18 |
| September | 26°C | 119 mm | 274 h | 19 |
| October | 16°C | 106 mm | 207 h | 17 |
| November | 9°C | 46 mm | 229 h | 27 |
| December | 1°C | 5 mm | 217 h | 22 |
About 3,003 hours of sun a year. Roughly 113 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.