Weather in Brno for September 2025
Výstraha pred búrku s krúpami - See hour by hour.
Until now, September 2025 in Brno is slightly cooler than the historical average by -1.9 °C.
Expect cooler weather in the next days in Brno with the forecast suggesting a temperature of 21 °C, lower than the historical average.
In general, the average temperature in Brno at the beginning of September is 27.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19 °C by the end of September.
Brno experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 114.3 mm.
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Brno Weather September
Temperatures trend during September in Brno
September weather in Brno day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Overcast | 28° /15° | 0.3 mm | 7 | |
| 2 Sept. |  Cloudy | 28° /16° | 0.9 mm | 7 | |
| 3 Sept. |  Thundery outbreaks possible | 27° /16° | 1.7 mm | 6 | |
| 4 Sept. |  Sunny | 28° /15° | 0 mm | 7 | |
| 5 Sept. |  Partly cloudy | 27° /15° | 0 mm | 6 | |
| 6 Sept. | Sunny | 24° /14° | 0.5 mm | 6 | |
| 7 Sept. | Sunny | 28° /14° | 0 mm | 7 | |
| 8 Sept. | Sunny | 28° /16° | 0 mm | 7 | |
| 9 Sept. | Sunny | 27° /14° | 2.2 mm | 7 | |
| 10 Sept. | Sunny | 22° /13° | 10.1 mm | 5 | |
| 11 Sept. | Sunny | 25° /14° | 0.4 mm | 6 | |
| 12 Sept. | Sunny | 21° /12° | 7.6 mm | 5 | |
| 13 Sept. | Thundery outbreaks possible | 19° /12° | 23 mm | 4 | |
| 14 Sept. | Cloudy | 18° /11° | 31.5 mm | 4 | |
| 15 Sept. | Sunny | 21° /11° | 8.9 mm | 5 | |
| 16 Sept. |  Patchy rain possible | 20° /10° | 4.5 mm | 0.7 | |
| 17 Sept. | Partly cloudy | 18° /9° | 0 mm | 0.9 | |
| 18 Sept. | Partly cloudy | 21° /8° | 0 mm | 0.9 | |
| 19 Sept. | Sunny | 25° /12° | 0 mm | 1.2 | |
| 20 Sept. | Sunny | 26° /13° | 0 mm | 1.5 | |
| 21 Sept. | Sunny | 25° /13° | 0 mm | 5 | |
| 22 Sept. | Overcast | 21° /14° | 0 mm | 4 | |
| 23 Sept. | Partly cloudy | 24° /12° | 0 mm | 5 | |
| 24 Sept. | Patchy rain possible | 22° /12° | 0.3 mm | 4 | |
| 25 Sept. | Sunny | 17° /8° | 0 mm | 4 | |
| 26 Sept. | Sunny | 19° /7° | 0 mm | 4 | |
| 27 Sept. | Patchy rain possible | 21° /10° | 0.1 mm | 3 | |
| 28 Sept. | Partly cloudy | 17° /10° | 0 mm | 4 | |
| 29 Sept. | Sunny | 18° /8° | 0 mm | 4 | |
| 30 Sept. |  Patchy light drizzle | 19° /9° | 0.3 mm | 4 | |
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Guide for Brno in September
In Brno, Czechia, September marks the transition from summer to autumn, bringing about noticeable changes in the weather. At the beginning of the month, Brno experiences mild and pleasant temperatures, with average highs around 20° and lows around 10°.
The weather is generally comfortable for outdoor activities, with a mix of sunny and partly cloudy days. However, occasional rainfall can be expected, so it's advisable for travelers to pack an umbrella or light rain jacket.
As the month progresses towards the end of September, Brno begins to witness a gradual drop in temperatures. The average highs decrease to around 16° and lows to around 7°. The weather becomes cooler, and there is a higher chance of rainfall.
Visitors can expect more overcast days and a noticeable change in the foliage as the autumn colors start to emerge.
Overall, September in Brno offers a pleasant transition from summer to autumn, with comfortable temperatures at the beginning of the month and a gradual shift towards cooler weather by the end.
It's a great time to explore the city's charming streets and parks while enjoying the changing seasonal scenery.
Brno in September - FAQ
September rainfall patterns in Brno
UV exposure in Brno during September
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