Hai Phong weather by month
Hai Phong runs from about 18°C in January to 29°C in June, with September the wettest month at 710 mm.
warmest month
June
29°C
coolest month
January
18°C
wettest month
September
710 mm
worst air month
July
47 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 18°C | 73 mm | 135 h | 31 |
| February | 19°C | 25 mm | 111 h | 32 |
| March | 21°C | 65 mm | 114 h | 24 |
| April | 27°C | 68 mm | 235 h | 30 |
| May | 27°C | 256 mm | 261 h | 21 |
| June | 29°C | 328 mm | 236 h | 22 |
| July | 29°C | 442 mm | 266 h | 47 |
| August | 29°C | 273 mm | 281 h | 32 |
| September | 27°C | 710 mm | 210 h | 27 |
| October | 25°C | 102 mm | 293 h | 22 |
| November | 23°C | 16 mm | 278 h | 24 |
| December | 18°C | 10 mm | 192 h | 32 |
About 2,612 hours of sun a year. Roughly 180 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.