Changsha weather by month
Changsha runs from about 6°C in February to 31°C in July, with June the wettest month at 573 mm.
warmest month
July
31°C
coolest month
February
6°C
wettest month
June
573 mm
worst air month
December
84 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 7°C | 90 mm | 160 h | 67 |
| February | 6°C | 131 mm | 99 h | 59 |
| March | 14°C | 103 mm | 179 h | 53 |
| April | 20°C | 274 mm | 136 h | 38 |
| May | 23°C | 126 mm | 214 h | 26 |
| June | 26°C | 573 mm | 164 h | 33 |
| July | 31°C | 265 mm | 322 h | 28 |
| August | 30°C | 47 mm | 347 h | 23 |
| September | 28°C | 51 mm | 282 h | 31 |
| October | 20°C | 110 mm | 197 h | 34 |
| November | 16°C | 32 mm | 200 h | 43 |
| December | 8°C | 19 mm | 204 h | 84 |
About 2,504 hours of sun a year. Roughly 155 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.