Brno weather in September
September in Brno: nice, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Brno · #230 of 897 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
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Brno climate normals — September
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Rainfall | 66 mm / 2.6 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 8.9 h/day | |
| Daylight | 12.6 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Brno in September — FAQ
- Is September a good time to visit Brno?
- September in Brno: nice, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Brno on SeasonMap's comfort score (88/100).
- What is the weather like in Brno in September?
- In September, Brno averages a daily high of 20.7°C and a low of 11.8°C, with about 65.8 mm of rain over roughly 10.6 rainy days.
- What is the air quality in Brno in September?
- Brno has a mean US Air Quality Index of about 43 in September.