Nanjing weather by month
Nanjing runs from about 4°C in January to 30°C in August, with June the wettest month at 281 mm.
warmest month
August
30°C
coolest month
January
4°C
wettest month
June
281 mm
worst air month
January
78 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 4°C | 53 mm | 201 h | 78 |
| February | 4°C | 100 mm | 143 h | 64 |
| March | 11°C | 101 mm | 223 h | 57 |
| April | 17°C | 143 mm | 179 h | 50 |
| May | 21°C | 92 mm | 276 h | 32 |
| June | 25°C | 281 mm | 225 h | 40 |
| July | 29°C | 239 mm | 229 h | 23 |
| August | 30°C | 162 mm | 334 h | 34 |
| September | 26°C | 231 mm | 278 h | 41 |
| October | 18°C | 105 mm | 192 h | 39 |
| November | 13°C | 15 mm | 208 h | 59 |
| December | 5°C | 12 mm | 247 h | 66 |
About 2,735 hours of sun a year. Roughly 153 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.