Brno Weather in September
September in Brno brings pleasant temperatures, with highs of 21°C (70°F) and nights dropping to 11°C (52°F). Rainfall is on the higher side this month, averaging around 71 mm (2.8 in), so keep a rain jacket handy.
Rainfall in Brno in September
On average, there are about 10 days with rain during this month, averaging 71 mm (2.8 in). Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in Brno in September
Brno in September is worth a visit. The temperature is perfect, with 21°C (70°F) during the day and 11°C (52°F) at night. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 11°C (52°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Brno in September
The area enjoys a balanced 177 hours of sunlight, ensuring it's neither too overcast nor too sunny.
Wind Speed in Brno in September
Wind speeds average 2 m/s (4 knots) during September. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Brno.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Czech Republic, check out our Brno's climate page.
Brno Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
21°C (70°F)
Chance of Rain
34%
Precipitation
71 mm (2.8 in)
Rainy days
10 days
Humidity
73%
Windspeed
2 m/s (4 knots)
Sunshine
177 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Brno typically drop from around 22°C (72°F) at the start of September to approximately 18°C (64°F) by the end. Nights are cool, with lows typically ranging from 8°C (46°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Brno in September
Browse day-by-day weather records for Brno spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Brno historical weather extremes in September
Based on weather observations in Brno between 1976 and 2025, these are the recorded extremes during September.
- Brno recorded its highest September temperature of 33°C (91°F) on September 3, 2024.
- The coldest September day was on September 19, 1977, with a maximum of 7°C (45°F).
- The lowest overnight temperature recorded in September was 1°C (34°F) (September 26, 2018).
Best Places in Czech Republic in September
Find out more about the weather in Czech Republic and which places have the best travel conditions in this month. See all of Czech Republic in September →
perfect weather
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What to Wear in Brno in September
For Brno in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Brno in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Czech Republic, check out our Brno's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Brno climate overview or explore weather in Czech Republic.
