Jeonju weather by month
Jeonju runs from about 1°C in January to 28°C in August, with July the wettest month at 321 mm.
warmest month
August
28°C
coolest month
January
1°C
wettest month
July
321 mm
worst air month
March
37 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 1°C | 49 mm | 201 h | 20 |
| February | 5°C | 131 mm | 153 h | 25 |
| March | 7°C | 76 mm | 263 h | 37 |
| April | 15°C | 86 mm | 237 h | 26 |
| May | 18°C | 137 mm | 313 h | 23 |
| June | 23°C | 116 mm | 275 h | 20 |
| July | 27°C | 321 mm | 245 h | 15 |
| August | 28°C | 92 mm | 366 h | 16 |
| September | 26°C | 188 mm | 286 h | 17 |
| October | 16°C | 98 mm | 209 h | 17 |
| November | 10°C | 79 mm | 236 h | 25 |
| December | 2°C | 18 mm | 195 h | 20 |
About 2,979 hours of sun a year. Roughly 139 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 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.