Graz weather in September
September in Graz: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Graz · #298 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Graz in September
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Graz climate normals — September
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 10°C / 51°F | |
| Rainfall | 76 mm / 3 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 12.6 h | |
| Wind | 10 km/h / 6 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Graz in September — FAQ
- Is September a good time to visit Graz?
- September in Graz: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Graz on SeasonMap's comfort score (87/100).
- What is the weather like in Graz in September?
- In September, Graz averages a daily high of 20.7°C and a low of 10.4°C, with about 76.3 mm of rain over roughly 11.2 rainy days.
- What is the air quality in Graz in September?
- Graz has a mean US Air Quality Index of about 38 in September.