What September feels like in Brno
Early autumn arrives in Brno with September. The middle of the day is pleasantly mild. After sunset it cools off noticeably — nights are cool. Humidity is on the high side, but mild temperatures keep it comfortable.
Rain in Brno in September
Expect a mix of dry and wet days, with rain about one day in 3. Wet days average about 8.3 mm (0.3 in), enough to soak you without an umbrella. That is heavier than Brno's usual 5.5 mm per rainy day across the year. It is among the three wettest months of the year.
Daylight and sunshine in September
On 15 September the sun rises at about 6:28 am and sets around 7:10 pm local time, giving 12 h 41 min of daylight. Evenings are drawing in — 1 h 47 min less daylight than mid-August. Measured sunshine covers about 70% of the daylight — there are plenty of bright spells.
How September compares to the rest of the year
Ranked by average high, September comes out as the 4th warmest month in Brno. Afternoons run 5°C (9°F) cooler than in August, with 1 mm more rain. October is cooler again. October averages a high of 14.2°C (57.6°F).
Who September suits
- Sightseeing: a good fit — daytime temperatures are fine for walking around.
- Parks & outdoor: a good fit — good conditions for sitting outside.
Tips for visiting Brno in September
Versatile Layers
Mornings and evenings are cooler than midday, so dress in layers.
Rain Protection
A packable rain jacket saves the day on showery afternoons.
Sunglasses
Plenty of sun, so bring sunglasses and a cap.
Quick questions
How warm is Brno in September?
Afternoons average 20.4°C (68.7°F) and nights about 11.6°C (52.9°F) — mild by most people's standards. It is the 4th warmest month of the year.
Does it rain a lot in Brno in September?
Yes, fairly — rain falls about one day in 3 and totals about 74 mm, so an umbrella is worth carrying.
What should I wear in Brno in September?
Pack versatile layers, rain protection and sunglasses. Bring something extra for the cooler evenings.
Is September or October better for visiting Brno?
On our 12-month climate ranking, September comes out ahead (#1 of 12 vs #3). October is cooler and has fewer rainy days.