Hangzhou weather by month
Hangzhou runs from about 6°C in January to 32°C in August, with June the wettest month at 433 mm.
warmest month
August
32°C
coolest month
January
6°C
wettest month
June
433 mm
worst air month
December
87 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 6°C | 45 mm | 228 h | 83 |
| February | 6°C | 161 mm | 137 h | 77 |
| March | 13°C | 71 mm | 232 h | 54 |
| April | 18°C | 260 mm | 139 h | 51 |
| May | 21°C | 125 mm | 260 h | 41 |
| June | 24°C | 433 mm | 155 h | 50 |
| July | 31°C | 61 mm | 290 h | 33 |
| August | 32°C | 154 mm | 348 h | 50 |
| September | 27°C | 132 mm | 261 h | 53 |
| October | 19°C | 73 mm | 174 h | 42 |
| November | 14°C | 102 mm | 201 h | 66 |
| December | 7°C | 21 mm | 217 h | 87 |
About 2,642 hours of sun a year. Roughly 150 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 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.