September weather forecast
Brno, Czech Republic

englishespañol中文
Share

Weather in September

September sees Brno transitioning from summer to autumn. The weather fluctuates significantly from August, with a considerable reduction in temperatures. Despite September’s 20.2°C (68.4°F) average temperatures, the month signals the commencement of cooler autumn weather. With daylight hours decreasing and the winds picking up pace, expect cloudy skies and a gradual drop in temperature throughout. This fall month also welcomes the first traces of precipitation after the dry summer spell.

Temperature

The arrival of September signals a shift in temperature, down from a moderately hot 26.1°C (79°F) in August to an agreeable 20.2°C (68.4°F). The average low-temperature during September nights is a fresh 10.7°C (51.3°F).

Humidity

The average relative humidity in September is 70%.

Rainfall

In Brno, Czech Republic, in September, it is raining for 8.3 days, with typically 18mm (0.71") of accumulated precipitation. Throughout the year, there are 115.7 rainfall days, and 251mm (9.88") of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Brno, Czech Republic.

Daylight

In Brno, the average length of the day in September is 12h and 36min.
On the first day of September, sunrise is at 06:10 and sunset at 19:36. On the last day of the month, sunrise is at 06:52 and sunset at 18:34 CEST.

Sunshine

In Brno, the average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index in Brno is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 4 suggests this advice:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Frequently asked questions

What is the temperature in September in Brno?

In September, in Brno, the average high-temperature is 20.2°C (68.4°F), and the average low-temperature is 10.7°C (51.3°F).

What is the average humidity in September in Brno?

In Brno, Czech Republic, the average relative humidity in September is 70%.

How much does it rain in Brno in September?

In Brno, during September, the rain falls for 8.3 days and regularly aggregates up to 18mm (0.71") of precipitation.

When it does not snow in Brno?

May through September are months without snowfall in Brno, Czech Republic.

Does it snow in Brno in September?

In Brno, Czech Republic, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Brno have in September?

In Brno, the average day length in September is 12h and 36min.

When is the sunrise / sunset in September in Brno?

In September, on the first day of the month, sunrise is at 06:10 and sunset at 19:36. On the last day of the month, in Brno, sunrise is at 06:52 and sunset at 18:34 CEST.

How many hours of sunshine does Brno have in September?

In Brno, Czech Republic, the average sunshine duration in September is 8.9h.

What is the UV index intensity in September in Brno?

In Brno, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Brno, Czech Republic

Average temperature in September - Brno, Czech Republic
  • Average high temperature in September: 20.2°C

The warmest month (with the highest average high temperature) is August (26.1°C).
The month with the lowest average high temperature is January (0.5°C).

  • Average low temperature in September: 10.7°C

The month with the highest average low temperature is August (14.7°C).
The coldest month (with the lowest average low temperature) is January (-3.9°C).

Average pressure in September
Brno, Czech Republic

Average pressure in September - Brno, Czech Republic
  • Average pressure in September: 1018.1mbar

The month with the highest atmospheric pressure is December (1019.6mbar).
The month with the lowest atmospheric pressure is June (1015mbar).

Average wind speed in September
Brno, Czech Republic

Average wind speed in September - Brno, Czech Republic
  • Average wind speed in September: 10.4km/h

The windiest month (with the highest average wind speed) is March (13.7km/h).
The calmest month (with the lowest average wind speed) is August (9.6km/h).

Average humidity in September
Brno, Czech Republic

Average humidity in September - Brno, Czech Republic
  • Average humidity in September: 70%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (65%).

Average rainfall in September
Brno, Czech Republic

Average rainfall in September - Brno, Czech Republic
  • Average rainfall in September: 18mm

The wettest month (with the highest rainfall) is May (41mm).
The driest months (with the least rainfall) are February and April (13mm).

Average rainfall days in September
Brno, Czech Republic

Average rainfall days in September - Brno, Czech Republic
  • Average rainfall days in September: 8.3 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (6.3 days).

Average snowfall in September
Brno, Czech Republic

Average snowfall in September - Brno, Czech Republic
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (74mm).
The months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days in September
Brno, Czech Republic

Average snowfall days in September - Brno, Czech Republic
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Brno, Czech Republic

Average daylight in September / Average sunshine in September - Brno, Czech Republic
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).

Average sunshine days in September
Brno, Czech Republic

Average sunshine days in September - Brno, Czech Republic
  • Average sunshine days in September: 19.7 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is May (14.3 days).

Average UV index in September
Brno, Czech Republic

Average UV index in September - Brno, Czech Republic
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Brno, Czech Republic

Average cloud cover in September - Brno, Czech Republic
  • Average cloud cover in September: 36

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Brno, Czech Republic

Average visibility in September - Brno, Czech Republic
  • Average visibility in September: 9km

The months with the highest visibility are April and August (10km).
The months with the lowest visibility are January and December (8km).

Brno, Czech Republic

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location