Vienna weather by month
Vienna runs from about 1°C in January to 24°C in August, with September the wettest month at 242 mm.
warmest month
August
24°C
coolest month
January
1°C
wettest month
September
242 mm
worst air month
December
26 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 1°C | 52 mm | 178 h | 24 |
| February | 8°C | 37 mm | 181 h | 17 |
| March | 9°C | 71 mm | 257 h | 18 |
| April | 12°C | 56 mm | 301 h | 10 |
| May | 16°C | 81 mm | 358 h | 7 |
| June | 21°C | 59 mm | 365 h | 6 |
| July | 24°C | 32 mm | 395 h | 5 |
| August | 24°C | 19 mm | 377 h | 7 |
| September | 17°C | 242 mm | 244 h | 7 |
| October | 12°C | 51 mm | 214 h | 8 |
| November | 5°C | 13 mm | 160 h | 19 |
| December | 3°C | 31 mm | 136 h | 26 |
About 3,166 hours of sun a year. Roughly 74 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.