Christchurch weather by month
Christchurch runs from about 8°C in July to 18°C in January, with October the wettest month at 80 mm.
warmest month
January
18°C
coolest month
July
8°C
wettest month
October
80 mm
worst air month
June
6 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 18°C | 46 mm | 378 h | 5 |
| February | 17°C | 30 mm | 308 h | 5 |
| March | 14°C | 32 mm | 299 h | 4 |
| April | 13°C | 17 mm | 252 h | 3 |
| May | 8°C | 31 mm | 209 h | 6 |
| June | 9°C | 56 mm | 170 h | 6 |
| July | 8°C | 39 mm | 177 h | 5 |
| August | 8°C | 66 mm | 227 h | 5 |
| September | 10°C | 54 mm | 289 h | 2 |
| October | 12°C | 80 mm | 310 h | 3 |
| November | 14°C | 30 mm | 340 h | 5 |
| December | 17°C | 75 mm | 337 h | 4 |
About 3,296 hours of sun a year. Roughly 57 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.