Hoi An weather by month
Hoi An runs from about 23°C in January to 31°C in June, with November the wettest month at 516 mm.
warmest month
June
31°C
coolest month
January
23°C
wettest month
November
516 mm
worst air month
April
30 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 23°C | 143 mm | 246 h | 17 |
| February | 24°C | 44 mm | 262 h | 15 |
| March | 25°C | 35 mm | 308 h | 19 |
| April | 29°C | 1 mm | 355 h | 30 |
| May | 29°C | 71 mm | 284 h | 25 |
| June | 31°C | 77 mm | 343 h | 23 |
| July | 29°C | 182 mm | 310 h | 15 |
| August | 31°C | 56 mm | 371 h | 16 |
| September | 28°C | 304 mm | 260 h | 11 |
| October | 26°C | 514 mm | 218 h | 11 |
| November | 25°C | 516 mm | 213 h | 16 |
| December | 23°C | 432 mm | 104 h | 14 |
About 3,274 hours of sun a year. Roughly 181 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.