Weather in Brno for September 2025
In general, the average temperature in Brno at the beginning of September is 28.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °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 in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  30° | 3  29° | 4  28° | 5 28° | 6  25° | 7 29° |
| 8 29° | 9 27° | 10 24° | 11 26° | 12 22° | 13 18° | 14 17° |
| 15 20° | 16 21° | 17 22° | 18 25° | 19  22° | 20 23° | 21 23° |
| 22  21° | 23 20° | 24 18° | 25 22° | 26 23° | 27 22° | 28 21° |
| 29 19° | 30 19° |
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Temperatures trend during September in Brno
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 28° /15° | 0.5 mm | 7 | |
| 2 Sept. | Cloudy | 30° /16° | 0.1 mm | 7 | |
| 3 Sept. | Thundery outbreaks possible | 29° /17° | 1.8 mm | 7 | |
| 4 Sept. | Partly cloudy | 28° /16° | 0 mm | 7 | |
| 5 Sept. | Overcast | 28° /16° | 0 mm | 7 | |
| 6 Sept. | Sunny | 25° /16° | 0.4 mm | 7 | |
| 7 Sept. | Sunny | 29° /16° | 0 mm | 8 | |
| 8 Sept. | Sunny | 29° /18° | 0 mm | 8 | |
| 9 Sept. | Sunny | 27° /14° | 3.3 mm | 7 | |
| 10 Sept. | Sunny | 24° /13° | 0.2 mm | 6 | |
| 11 Sept. | Sunny | 26° /13° | 0 mm | 7 | |
| 12 Sept. | Sunny | 22° /12° | 10.7 mm | 5 | |
| 13 Sept. | Thundery outbreaks possible | 18° /11° | 30.2 mm | 4 | |
| 14 Sept. | Cloudy | 17° /11° | 42.2 mm | 4 | |
| 15 Sept. | Sunny | 20° /11° | 13.2 mm | 5 | |
| 16 Sept. | Partly cloudy | 21° /11° | 4.9 mm | 6 | |
| 17 Sept. | Sunny | 22° /13° | 0.5 mm | 6 | |
| 18 Sept. | Partly cloudy | 25° /15° | 0 mm | 6 | |
| 19 Sept. | Light rain shower | 22° /13° | 3.5 mm | 6 | |
| 20 Sept. | Partly cloudy | 23° /13° | 0 mm | 6 | |
| 21 Sept. | Cloudy | 23° /14° | 0 mm | 6 | |
| 22 Sept. | Light drizzle | 21° /12° | 1.6 mm | 6 | |
| 23 Sept. | Cloudy | 20° /12° | 0 mm | 5 | |
| 24 Sept. | Overcast | 18° /12° | 0.5 mm | 4 | |
| 25 Sept. | Overcast | 22° /12° | 0 mm | 5 | |
| 26 Sept. | Sunny | 23° /14° | 0 mm | 6 | |
| 27 Sept. | Sunny | 22° /13° | 0.4 mm | 6 | |
| 28 Sept. | Sunny | 21° /11° | 0.1 mm | 6 | |
| 29 Sept. | Sunny | 19° /9° | 0 mm | 6 | |
| 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.
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Brno in September - FAQ
What to pack to Brno in September?
As you prepare for your trip to Brno in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Brno, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Brno
UV exposure in Brno during September
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