Naples weather by month
Naples runs from about 10°C in December to 28°C in August, with September the wettest month at 149 mm.
warmest month
August
28°C
coolest month
December
10°C
wettest month
September
149 mm
worst air month
December
27 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 11°C | 81 mm | 212 h | 13 |
| February | 12°C | 99 mm | 239 h | 15 |
| March | 13°C | 118 mm | 301 h | 20 |
| April | 15°C | 45 mm | 344 h | 14 |
| May | 18°C | 68 mm | 369 h | 9 |
| June | 23°C | 23 mm | 394 h | 10 |
| July | 27°C | 27 mm | 426 h | 8 |
| August | 28°C | 35 mm | 393 h | 11 |
| September | 21°C | 149 mm | 313 h | 7 |
| October | 19°C | 141 mm | 269 h | 7 |
| November | 14°C | 58 mm | 239 h | 13 |
| December | 10°C | 132 mm | 224 h | 27 |
About 3,723 hours of sun a year. Roughly 99 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 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.