Climate averages 1991–2020
Klagenfurt am Wörthersee weather
in September.
A mild, wet month: the 4th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Klagenfurt am Wörthersee: daytime highs average 19.2°C and nights cool to about 11.1°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 139 mm of rain on roughly 12 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average September day.
The nearest other city in this atlas is Ljubljana (66 km away). In September its highs average 19.8°C, 0.6°C warmer than Klagenfurt am Wörthersee, with 125 mm of rain.
Among the 6 cities listed in Austria, Klagenfurt am Wörthersee ranks joint 4th of 6 for the warmest September highs and joint 4th of 6 for the driest September (rainfall, lowest first). The mean September high of those 6 cities is 19.4°C; Klagenfurt am Wörthersee is 0.2°C cooler than that mean.
From September to October, average highs fall by 5.0°C to 14.2°C, and monthly rainfall falls from 139 mm to 121 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
Klagenfurt am Wörthersee climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.1°C-4.0°C | -4.0°C | 48 | 6.8 | 9.09 h |
| February | 4.9°C-2.9°C | -2.9°C | 60 | 7.4 | 10.310 h |
| March | 9.4°C0.8°C | 0.8°C | 76 | 9.7 | 11.912 h |
| April | 14.5°C4.9°C | 4.9°C | 96 | 12.6 | 13.514 h |
| May | 18.9°C9.4°C | 9.4°C | 119 | 14.6 | 15.015 h |
| June | 22.6°C13.1°C | 13.1°C | 136 | 14.8 | 15.816 h |
| July | 24.5°C15.1°C | 15.1°C | 140 | 14.9 | 15.415 h |
| August | 24.1°C15.3°C | 15.3°C | 152 | 14.0 | 14.214 h |
| September, selected | 19.2°C11.1°C | 11.1°C | 139 | 11.5 | 12.613 h |
| October | 14.2°C6.9°C | 6.9°C | 121 | 9.7 | 10.911 h |
| November | 8.5°C2.5°C | 2.5°C | 120 | 10.6 | 9.59 h |
| December | 3.6°C-2.8°C | -2.8°C | 80 | 8.5 | 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
- Ljubljana in SeptemberSlovenia · 66 kmHigh 19.8°C · Low 11.5°C · 125 mm rain
- Graz in SeptemberAustria · 99 kmHigh 19.2°C · Low 9.7°C · 83 mm rain
- Udine in SeptemberItaly · 103 kmHigh 21.4°C · Low 12.3°C · 153 mm rain
- Maribor in SeptemberSlovenia · 103 kmHigh 20.5°C · Low 11.9°C · 111 mm rain
- Trieste in SeptemberItaly · 116 kmHigh 22.3°C · Low 14.8°C · 170 mm rain
- Rijeka in SeptemberCroatia · 145 kmHigh 22.3°C · Low 14.8°C · 177 mm rain
- Zagreb in SeptemberCroatia · 157 kmHigh 21.8°C · Low 12.6°C · 94 mm rain
- Salzburg in SeptemberAustria · 162 kmHigh 19.0°C · Low 9.6°C · 165 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 Klagenfurt am Wörthersee) is explained once on the Klagenfurt am Wörthersee year overview and on the Sources, method and limits page.