Graz weather by month
Graz runs from about 0°C in January to 23°C in August, with September the wettest month at 302 mm.
warmest month
August
23°C
coolest month
January
0°C
wettest month
September
302 mm
worst air month
December
34 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 0°C | 42 mm | 180 h | 30 |
| February | 6°C | 19 mm | 201 h | 24 |
| March | 8°C | 61 mm | 240 h | 19 |
| April | 11°C | 60 mm | 314 h | 11 |
| May | 15°C | 187 mm | 306 h | 7 |
| June | 19°C | 116 mm | 336 h | 7 |
| July | 22°C | 124 mm | 393 h | 5 |
| August | 23°C | 50 mm | 391 h | 8 |
| September | 15°C | 302 mm | 244 h | 8 |
| October | 11°C | 82 mm | 179 h | 10 |
| November | 3°C | 12 mm | 192 h | 20 |
| December | 1°C | 9 mm | 155 h | 34 |
About 3,131 hours of sun a year. Roughly 106 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.