Climate Insights for Brno

The climate in Brno is cool. The average annual temperature is 10°C and approximately 677mm of precipitation falls per year. Brno receives a notable amount of rainfall throughout the year, including during its driest month. Brno is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to -3°C. Snowfall occurs from January to December, with around 56cm accumulating over the season.

Temperatures in Brno vary considerably across the year, with a 28°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 25°C with a mean of 20°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is -1°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Brno is a relatively dry area, receiving approximately 677mm of precipitation annually, which averages out to around 56mm per month. The wettest month is September, averaging 88mm of rainfall. July and June also tend to see above-average precipitation. The driest month is February, with just 35mm. That's 54mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 56cm accumulating over the season. December typically sees the most snow at around 18cm.

Brno is relatively calm, with an average annual wind speed of 11km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 12km/h in winter, 12km/h in spring, 10km/h in summer, 11km/h in autumn.

It is currently summer in Brno, which began on June 21, 2026. Brno is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 25°C, while the coldest stretch bottoms out in January near -3°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Brno is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 79mm per month. By contrast, January can be quite cold with temperatures dropping to -3°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Brno based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.