Napier weather by month
Napier runs from about 10°C in July to 20°C in January, with June the wettest month at 151 mm.
warmest month
January
20°C
coolest month
July
10°C
wettest month
June
151 mm
worst air month
January
5 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 20°C | 145 mm | 324 h | 5 |
| February | 19°C | 43 mm | 318 h | 5 |
| March | 16°C | 44 mm | 291 h | 4 |
| April | 15°C | 31 mm | 257 h | 4 |
| May | 11°C | 75 mm | 242 h | 4 |
| June | 11°C | 151 mm | 189 h | 4 |
| July | 10°C | 83 mm | 203 h | 3 |
| August | 11°C | 51 mm | 245 h | 4 |
| September | 13°C | 38 mm | 280 h | 3 |
| October | 15°C | 35 mm | 325 h | 3 |
| November | 17°C | 63 mm | 307 h | 5 |
| December | 20°C | 135 mm | 313 h | 4 |
About 3,294 hours of sun a year. Roughly 90 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.