Hualien weather by month
Hualien runs from about 17°C in January to 28°C in August, with October the wettest month at 924 mm.
warmest month
August
28°C
coolest month
January
17°C
wettest month
October
924 mm
worst air month
April
23 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 17°C | 61 mm | 204 h | 13 |
| February | 19°C | 61 mm | 202 h | 13 |
| March | 19°C | 57 mm | 223 h | 16 |
| April | 24°C | 95 mm | 268 h | 23 |
| May | 25°C | 304 mm | 262 h | 15 |
| June | 27°C | 157 mm | 304 h | 11 |
| July | 28°C | 459 mm | 343 h | 12 |
| August | 28°C | 85 mm | 327 h | 9 |
| September | 27°C | 349 mm | 300 h | 7 |
| October | 26°C | 924 mm | 244 h | 9 |
| November | 23°C | 171 mm | 179 h | 10 |
| December | 18°C | 60 mm | 174 h | 10 |
About 3,030 hours of sun a year. Roughly 196 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.