Rome weather by month
Rome runs from about 8°C in December to 28°C in August, with October the wettest month at 149 mm.
warmest month
August
28°C
coolest month
December
8°C
wettest month
October
149 mm
worst air month
December
24 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 9°C | 44 mm | 218 h | 15 |
| February | 11°C | 84 mm | 222 h | 15 |
| March | 13°C | 124 mm | 275 h | 18 |
| April | 15°C | 40 mm | 356 h | 12 |
| May | 18°C | 107 mm | 366 h | 8 |
| June | 23°C | 24 mm | 407 h | 8 |
| July | 28°C | 16 mm | 424 h | 7 |
| August | 28°C | 40 mm | 396 h | 9 |
| September | 21°C | 140 mm | 316 h | 7 |
| October | 18°C | 149 mm | 241 h | 7 |
| November | 13°C | 20 mm | 236 h | 13 |
| December | 8°C | 89 mm | 234 h | 24 |
About 3,691 hours of sun a year. Roughly 87 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.