Cool
Average highs are around 19°C, so pack for cooler days.
September verdict
Mixed for holiday weather
Average highs are around 19°C, so pack for cooler days. Sunshine averages 5.2h per day, enough for a balanced month. Rainfall averages 41mm, which is relatively low for holiday planning.

Monthly averages
Temp
19°C
Rain
41mm
Sun
5.2h
Weather score
45
Mixed
Cool
Average highs are around 19°C, so pack for cooler days.
Drier
Rainfall averages 41mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 5.2h per day, enough for a balanced month.
Map
Compare Brno, Czech Republic with nearby places by weather score, rain, sun, temperature, and swim conditions.
September19°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
September41mm average rain
September sits on the drier side of Brno's year, which helps with sightseeing and transfers.
Driest monthsJanuary to April and September to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
September5.2 hours average sun
September sits close to Brno's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
September45 weather score
September sits close to Brno's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.