Wellington weather by month
Wellington runs from about 11°C in July to 18°C in January, with October the wettest month at 123 mm.
warmest month
January
18°C
coolest month
July
11°C
wettest month
October
123 mm
worst air month
February
6 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 18°C | 22 mm | 397 h | 6 |
| February | 17°C | 27 mm | 355 h | 6 |
| March | 15°C | 47 mm | 314 h | 5 |
| April | 14°C | 96 mm | 242 h | 4 |
| May | 11°C | 77 mm | 232 h | 5 |
| June | 11°C | 76 mm | 190 h | 4 |
| July | 11°C | 82 mm | 176 h | 4 |
| August | 11°C | 93 mm | 237 h | 4 |
| September | 12°C | 92 mm | 278 h | 4 |
| October | 13°C | 123 mm | 299 h | 4 |
| November | 14°C | 45 mm | 330 h | 6 |
| December | 16°C | 90 mm | 357 h | 5 |
About 3,407 hours of sun a year. Roughly 88 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.