Climate averages 1991–2020
Graz weather
in September.
A mild, moderately wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Graz: daytime highs average 19.2°C and nights cool to about 9.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 83 mm of rain on roughly 10 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 37 min on an average September day.
The nearest other city in this atlas is Maribor (59 km away). In September its highs average 20.5°C, 1.3°C warmer than Graz, with 111 mm of rain.
Among the 6 cities listed in Austria, Graz ranks joint 4th of 6 for the warmest September highs and 3rd of 6 for the driest September (rainfall, lowest first). The mean September high of those 6 cities is 19.4°C; Graz is 0.2°C cooler than that mean.
From September to October, average highs fall by 4.9°C to 14.3°C, and monthly rainfall falls from 83 mm to 64 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Graz climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.4°C-5.3°C | -5.3°C | 27 | 6.2 | 9.09 h |
| February | 5.6°C-4.3°C | -4.3°C | 33 | 7.0 | 10.210 h |
| March | 10.0°C-0.6°C | -0.6°C | 45 | 8.4 | 11.912 h |
| April | 15.0°C3.6°C | 3.6°C | 54 | 9.9 | 13.614 h |
| May | 19.0°C8.3°C | 8.3°C | 85 | 13.0 | 15.015 h |
| June | 22.6°C11.9°C | 11.9°C | 90 | 13.5 | 15.816 h |
| July | 24.4°C13.8°C | 13.8°C | 84 | 12.8 | 15.515 h |
| August | 24.0°C13.8°C | 13.8°C | 89 | 11.8 | 14.214 h |
| September, selected | 19.2°C9.7°C | 9.7°C | 83 | 10.1 | 12.613 h |
| October | 14.3°C5.4°C | 5.4°C | 64 | 9.3 | 10.911 h |
| November | 8.6°C1.2°C | 1.2°C | 59 | 8.5 | 9.49 h |
| December | 3.6°C-4.0°C | -4.0°C | 45 | 7.8 | 8.69 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Maribor in SeptemberSlovenia · 59 kmHigh 20.5°C · Low 11.9°C · 111 mm rain
- Szombathely in SeptemberHungary · 91 kmHigh 20.4°C · Low 11.7°C · 76 mm rain
- Klagenfurt am Wörthersee in SeptemberAustria · 99 kmHigh 19.2°C · Low 11.1°C · 139 mm rain
- Ljubljana in SeptemberSlovenia · 134 kmHigh 19.8°C · Low 11.5°C · 125 mm rain
- Vienna in SeptemberAustria · 145 kmHigh 20.3°C · Low 11.8°C · 71 mm rain
- Zagreb in SeptemberCroatia · 145 kmHigh 21.8°C · Low 12.6°C · 94 mm rain
- Linz in SeptemberAustria · 163 kmHigh 19.4°C · Low 11.1°C · 74 mm rain
- Bratislava in SeptemberSlovakia · 173 kmHigh 20.7°C · Low 12.0°C · 67 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Graz) is explained once on the Graz year overview and on the Sources, method and limits page.