Zurich weather by month
Zurich runs from about 2°C in December to 21°C in August, with May the wettest month at 173 mm.
warmest month
August
21°C
coolest month
December
2°C
wettest month
May
173 mm
worst air month
December
17 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 2°C | 105 mm | 139 h | 14 |
| February | 6°C | 64 mm | 154 h | 10 |
| March | 7°C | 125 mm | 212 h | 15 |
| April | 9°C | 125 mm | 248 h | 11 |
| May | 14°C | 173 mm | 278 h | 7 |
| June | 18°C | 161 mm | 298 h | 7 |
| July | 20°C | 133 mm | 363 h | 5 |
| August | 21°C | 74 mm | 346 h | 9 |
| September | 15°C | 143 mm | 241 h | 7 |
| October | 12°C | 111 mm | 182 h | 9 |
| November | 5°C | 90 mm | 179 h | 13 |
| December | 2°C | 102 mm | 131 h | 17 |
About 2,771 hours of sun a year. Roughly 140 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.