Climate averages 1991–2020
Bratislava weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Bratislava: daytime highs average 20.7°C and nights cool to about 12.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 67 mm of rain on roughly 9 days, which makes September a moderately wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 38 min on an average September day.
The nearest other city in this atlas is Vienna (55 km away). In September its highs average 20.3°C, about as warm as Bratislava, with 71 mm of rain.
Among the 6 cities listed in Slovakia, Bratislava ranks 2nd 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 19.5°C; Bratislava is 1.3°C warmer than that mean.
From September to October, average highs fall by 5.7°C to 15.0°C, and monthly rainfall falls from 67 mm to 47 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
Bratislava climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.9°C-3.1°C | -3.1°C | 35 | 7.9 | 8.89 h |
| February | 5.5°C-2.3°C | -2.3°C | 33 | 7.8 | 10.210 h |
| March | 10.2°C1.1°C | 1.1°C | 42 | 8.8 | 11.912 h |
| April | 16.0°C5.6°C | 5.6°C | 44 | 8.1 | 13.614 h |
| May | 20.4°C10.6°C | 10.6°C | 68 | 11.1 | 15.215 h |
| June | 24.1°C14.5°C | 14.5°C | 73 | 11.3 | 16.016 h |
| July | 26.3°C16.6°C | 16.6°C | 78 | 11.6 | 15.616 h |
| August | 26.1°C16.4°C | 16.4°C | 67 | 9.5 | 14.314 h |
| September, selected | 20.7°C12.0°C | 12.0°C | 67 | 9.0 | 12.613 h |
| October | 15.0°C7.3°C | 7.3°C | 47 | 8.7 | 10.911 h |
| November | 8.9°C3.0°C | 3.0°C | 46 | 8.8 | 9.39 h |
| December | 3.6°C-1.7°C | -1.7°C | 40 | 8.4 | 8.48 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
- Vienna in SeptemberAustria · 55 kmHigh 20.3°C · Low 11.8°C · 71 mm rain
- Győr in SeptemberHungary · 65 kmHigh 21.3°C · Low 12.7°C · 62 mm rain
- Nitra in SeptemberSlovakia · 75 kmHigh 21.0°C · Low 12.0°C · 60 mm rain
- Szombathely in SeptemberHungary · 108 kmHigh 20.4°C · Low 11.7°C · 76 mm rain
- Brno in SeptemberCzechia · 122 kmHigh 19.5°C · Low 11.0°C · 64 mm rain
- Zlín in SeptemberCzechia · 127 kmHigh 19.0°C · Low 10.8°C · 76 mm rain
- Székesfehérvár in SeptemberHungary · 144 kmHigh 21.4°C · Low 12.6°C · 58 mm rain
- Olomouc in SeptemberCzechia · 161 kmHigh 19.0°C · Low 10.4°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 Bratislava) is explained once on the Bratislava year overview and on the Sources, method and limits page.