Lisbon weather by month
Lisbon runs from about 12°C in December to 23°C in August, with January the wettest month at 137 mm.
warmest month
August
23°C
coolest month
December
12°C
wettest month
January
137 mm
worst air month
August
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 13°C | 137 mm | 223 h | 8 |
| February | 14°C | 81 mm | 237 h | 9 |
| March | 14°C | 90 mm | 281 h | 10 |
| April | 17°C | 22 mm | 343 h | 10 |
| May | 18°C | 12 mm | 382 h | 9 |
| June | 20°C | 47 mm | 362 h | 8 |
| July | 22°C | 13 mm | 400 h | 9 |
| August | 23°C | 0 mm | 378 h | 13 |
| September | 21°C | 10 mm | 321 h | 9 |
| October | 19°C | 112 mm | 271 h | 11 |
| November | 16°C | 63 mm | 234 h | 9 |
| December | 12°C | 10 mm | 265 h | 10 |
About 3,697 hours of sun a year. Roughly 59 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.