Annecy weather by month
Annecy runs from about 4°C in December to 22°C in August, with May the wettest month at 247 mm.
warmest month
August
22°C
coolest month
December
4°C
wettest month
May
247 mm
worst air month
March
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 4°C | 147 mm | 167 h | 12 |
| February | 7°C | 106 mm | 186 h | 9 |
| March | 8°C | 142 mm | 223 h | 14 |
| April | 10°C | 120 mm | 301 h | 10 |
| May | 14°C | 247 mm | 309 h | 7 |
| June | 18°C | 131 mm | 351 h | 7 |
| July | 21°C | 147 mm | 399 h | 5 |
| August | 22°C | 43 mm | 383 h | 8 |
| September | 15°C | 201 mm | 249 h | 5 |
| October | 14°C | 150 mm | 237 h | 10 |
| November | 8°C | 85 mm | 222 h | 10 |
| December | 4°C | 107 mm | 180 h | 13 |
About 3,207 hours of sun a year. Roughly 164 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 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.