Barcelona weather by month
Barcelona runs from about 10°C in December to 26°C in August, with October the wettest month at 149 mm.
warmest month
August
26°C
coolest month
December
10°C
wettest month
October
149 mm
worst air month
December
16 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 10°C | 40 mm | 227 h | 11 |
| February | 12°C | 20 mm | 254 h | 12 |
| March | 13°C | 74 mm | 298 h | 14 |
| April | 14°C | 143 mm | 309 h | 12 |
| May | 17°C | 39 mm | 400 h | 11 |
| June | 21°C | 70 mm | 371 h | 11 |
| July | 25°C | 30 mm | 411 h | 8 |
| August | 26°C | 36 mm | 379 h | 12 |
| September | 21°C | 89 mm | 291 h | 8 |
| October | 18°C | 149 mm | 264 h | 11 |
| November | 14°C | 88 mm | 218 h | 10 |
| December | 10°C | 30 mm | 245 h | 16 |
About 3,667 hours of sun a year. Roughly 81 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.