Bratislava weather in September
September in Bratislava: nice, a little rain, with clean air — an excellent time to visit.
#5 of 12 months in Bratislava · #214 of 604 destinations to visit in September · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Bratislava climate normals — September
| Daytime high | 22°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 21°C / 70°F | |
| Rainfall | 62 mm / 2.5 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 12°C / 54°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 12.6 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Bratislava?
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Bratislava in September — FAQ
- Is September a good time to visit Bratislava?
- September in Bratislava: nice, a little rain, with clean air — an excellent time to visit. It ranks #5 of 12 months for Bratislava on SeasonMap's comfort score (84/100).
- What is the weather like in Bratislava in September?
- In September, Bratislava averages a daily high of 21.9°C and a low of 12.7°C, with about 62.3 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Bratislava in September?
- Bratislava has a mean US Air Quality Index of about 40 in September.