Suzhou weather by month
Suzhou runs from about 5°C in January to 31°C in August, with June the wettest month at 329 mm.
warmest month
August
31°C
coolest month
January
5°C
wettest month
June
329 mm
worst air month
January
69 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 5°C | 40 mm | 220 h | 69 |
| February | 6°C | 113 mm | 129 h | 66 |
| March | 11°C | 48 mm | 232 h | 49 |
| April | 17°C | 156 mm | 162 h | 44 |
| May | 20°C | 62 mm | 264 h | 27 |
| June | 24°C | 329 mm | 170 h | 29 |
| July | 30°C | 143 mm | 274 h | 27 |
| August | 31°C | 96 mm | 351 h | 35 |
| September | 27°C | 221 mm | 259 h | 42 |
| October | 19°C | 127 mm | 181 h | 36 |
| November | 14°C | 119 mm | 201 h | 58 |
| December | 6°C | 17 mm | 236 h | 62 |
About 2,679 hours of sun a year. Roughly 145 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.