Monaco weather by month
Monaco runs from about 9°C in December to 26°C in August, with October the wettest month at 248 mm.
warmest month
August
26°C
coolest month
December
9°C
wettest month
October
248 mm
worst air month
March
9 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 9°C | 77 mm | 213 h | 5 |
| February | 11°C | 202 mm | 222 h | 7 |
| March | 11°C | 234 mm | 262 h | 9 |
| April | 14°C | 65 mm | 337 h | 9 |
| May | 17°C | 84 mm | 373 h | 6 |
| June | 20°C | 64 mm | 396 h | 8 |
| July | 25°C | 2 mm | 440 h | 6 |
| August | 26°C | 26 mm | 396 h | 9 |
| September | 20°C | 172 mm | 293 h | 6 |
| October | 18°C | 248 mm | 243 h | 6 |
| November | 13°C | 23 mm | 238 h | 5 |
| December | 9°C | 26 mm | 246 h | 6 |
About 3,659 hours of sun a year. Roughly 122 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 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.