Hong Kong weather by month
Hong Kong runs from about 16°C in January to 28°C in July, with April the wettest month at 547 mm.
warmest month
July
28°C
coolest month
January
16°C
wettest month
April
547 mm
worst air month
December
58 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 16°C | 9 mm | 263 h | 45 |
| February | 18°C | 28 mm | 200 h | 41 |
| March | 20°C | 85 mm | 184 h | 33 |
| April | 24°C | 547 mm | 230 h | 29 |
| May | 24°C | 471 mm | 195 h | 25 |
| June | 27°C | 312 mm | 223 h | 23 |
| July | 28°C | 277 mm | 319 h | 31 |
| August | 28°C | 376 mm | 266 h | 27 |
| September | 27°C | 416 mm | 261 h | 27 |
| October | 25°C | 17 mm | 296 h | 36 |
| November | 21°C | 305 mm | 210 h | 35 |
| December | 16°C | 0 mm | 260 h | 58 |
About 2,907 hours of sun a year. Roughly 223 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 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.