Monthly climate guide
Brno weather in September
September in Brno is typically warm, with average daytime highs around 22°C (72°F) and night-time lows near 11°C (51°F). The month usually brings about 65 mm of rain (some rain) and is often cloudy. Daytime highs are 6°C cooler than August and 7°C warmer than October.
What stands out in September
- It's one of the sunniest months here, with cloud cover around 62%.
- Temperatures are falling — expect highs around 7°C lower by October.
- Brno is usually about 2°C warmer than Český Krumlov, 170 km away, in September.
- It's wetter than a typical month in Brno — roughly 37% more rain than average.
Avg high
22°C
72°F
Avg low
11°C
51°F
Rainfall
65 mm
some rain
Humidity
69%
relative
Sky
62%
cloud · often cloudy
Brno weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 2°C / 35°F | -4°C / 24°F | 34 mm | 91% | 84% |
| February | 4°C / 40°F | -4°C / 26°F | 30 mm | 87% | 77% |
| March | 10°C / 50°F | 0°C / 31°F | 28 mm | 79% | 67% |
| April | 16°C / 61°F | 4°C / 40°F | 30 mm | 72% | 62% |
| May | 20°C / 68°F | 9°C / 48°F | 67 mm | 70% | 66% |
| June | 25°C / 78°F | 14°C / 56°F | 70 mm | 65% | 67% |
| July | 28°C / 82°F | 15°C / 60°F | 67 mm | 61% | 65% |
| August | 28°C / 82°F | 15°C / 59°F | 61 mm | 61% | 58% |
| September | 22°C / 72°F | 11°C / 51°F | 65 mm | 69% | 62% |
| October | 15°C / 60°F | 5°C / 42°F | 51 mm | 81% | 70% |
| November | 8°C / 47°F | 2°C / 35°F | 32 mm | 89% | 78% |
| December | 3°C / 38°F | -2°C / 28°F | 33 mm | 92% | 83% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
Is September a good time to visit Brno?
Compare the months in the chart above to find your ideal window.
Best time to visit Brno →Other Czech Republic cities in September
Cite or embed this data
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Brno weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/czech-republic/brno/september
<a href="https://weathercompare.eu/weather/czech-republic/brno/september">Brno weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/czech-republic/brno" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Brno weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/czech-republic/brno/september">Brno weather in September</a> – WeatherCompare</p>
Brno in September: quick answers
Is September a good time to visit Brno?
September is a reasonable time for Brno: highs around 22°C and about 65 mm of rain, though not one of the three best months.
How warm is Brno in September?
Average highs are about 22°C (72°F) and average lows about 11°C (51°F), based on 10 years of daily data.
Does it rain a lot in Brno in September?
Brno typically gets around 65 mm of rain in September — some rain.
Figures are long-term averages for the area around Brno (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.