Bologna weather by month
Bologna runs from about 4°C in January to 27°C in July, with October the wettest month at 177 mm.
warmest month
July
27°C
coolest month
January
4°C
wettest month
October
177 mm
worst air month
January
32 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 4°C | 78 mm | 185 h | 32 |
| February | 9°C | 86 mm | 191 h | 20 |
| March | 11°C | 70 mm | 236 h | 20 |
| April | 14°C | 66 mm | 308 h | 13 |
| May | 17°C | 97 mm | 339 h | 7 |
| June | 22°C | 127 mm | 376 h | 7 |
| July | 27°C | 56 mm | 435 h | 6 |
| August | 27°C | 38 mm | 378 h | 8 |
| September | 20°C | 167 mm | 274 h | 6 |
| October | 16°C | 177 mm | 172 h | 9 |
| November | 8°C | 11 mm | 207 h | 18 |
| December | 4°C | 98 mm | 187 h | 31 |
About 3,288 hours of sun a year. Roughly 110 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.