September weather forecast
Banja Luka, Bosnia and Herzegovina

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The Iconic Christ the Saviour Orthodox Cathedral in Banja Luka, Bosnia and Herzegovina
The Iconic Christ the Saviour Orthodox Cathedral in Banja Luka, Bosnia and Herzegovina

Weather in September

September lends a cooler touch to Banja Luka's climate as the city begins transitioning into the autumn season. Reflecting this shift, the temperature descends significantly from 27.5°C (81.5°F) in August to a more manageable 21.5°C (70.7°F). The days grow shorter and inherently cooler, while leaves start introducing shades of fall. September's weather gently bridges the gap between the heat of summer and the chill of the upcoming winter. Banja Luka thus enters the fall season graceful and ablaze with autumn colors.

Temperature

September in Banja Luka brings a minor decrease, with the average high-temperature reducing from a moderately hot 27.5°C (81.5°F) in August to a pleasant 21.5°C (70.7°F). Banja Luka, in September, witnesses an average low-temperature of 9.8°C (49.6°F).

Humidity

In September, the average relative humidity in Banja Luka is 73%.

Rainfall

In Banja Luka, Bosnia and Herzegovina, during September, the rain falls for 13.2 days and regularly aggregates up to 44mm (1.73") of precipitation. In Banja Luka, during the entire year, the rain falls for 160.5 days and collects up to 664mm (26.14") of precipitation.

Snowfall

In Banja Luka, Bosnia and Herzegovina, snow does not fall in May through September.

Daylight

The average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 06:14 and sunset at 19:28. On the last day of September, sunrise is at 06:48 and sunset at 18:33 CEST.

Sunshine

In September, the average sunshine in Banja Luka is 9.2h.

UV index

In Banja Luka, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 4 during September leads to these instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
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Frequently asked questions

What are September temperatures in Banja Luka?

In Banja Luka, 21.5°C (70.7°F) is the average high-temperature and 9.8°C (49.6°F) is the average low-temperature during September. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, in August is calculated to be 29°C (84.2°F).

What is the average humidity in September in Banja Luka?

In September, the average relative humidity in Banja Luka, Bosnia and Herzegovina, is 73%.

How much does it rain in Banja Luka in September?

In Banja Luka, in September, it is raining for 13.2 days, with typically 44mm (1.73") of accumulated precipitation.

When it does not snow in Banja Luka?

May through September are months without snowfall in Banja Luka.

Does it snow in Banja Luka in September?

In Banja Luka, Bosnia and Herzegovina, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Banja Luka have in September?

In September, the average day length in Banja Luka is 12h and 32min.

When are sunrise and sunset in September in Banja Luka?

On the first day of September in Banja Luka, Bosnia and Herzegovina, sunrise is at 06:14 and sunset at 19:28. On the last day of the month, sunrise is at 06:48 and sunset at 18:33 CEST.

How long on average sun shines in September in Banja Luka?

In Banja Luka, the average sunshine duration in September is 9.2h.

What is the UV index intensity in September in Banja Luka?

In September, the average daily maximum UV index in Banja Luka is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health 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 visibility

Average temperature in September
Banja Luka, Bosnia and Herzegovina

Average temperature in September - Banja Luka, Bosnia and Herzegovina
  • Average high temperature in September: 21.5°C

The warmest month (with the highest average high temperature) is August (27.5°C).
The month with the lowest average high temperature is January (3.8°C).

  • Average low temperature in September: 9.8°C

The month with the highest average low temperature is August (13.6°C).
The coldest month (with the lowest average low temperature) is January (-2.6°C).

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Average pressure in September
Banja Luka, Bosnia and Herzegovina

Average pressure in September - Banja Luka, Bosnia and Herzegovina
  • Average pressure in September: 1017.3mbar

The month with the highest atmospheric pressure is December (1020.4mbar).
The months with the lowest atmospheric pressure are May, June and July (1014.6mbar).

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Average wind speed in September
Banja Luka, Bosnia and Herzegovina

Average wind speed in September - Banja Luka, Bosnia and Herzegovina
  • Average wind speed in September: 6.1km/h

The windiest month (with the highest average wind speed) is March (8.1km/h).
The calmest months (with the lowest average wind speed) are August and September (6.1km/h).

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Average humidity in September
Banja Luka, Bosnia and Herzegovina

Average humidity in September - Banja Luka, Bosnia and Herzegovina
  • Average humidity in September: 73%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (67%).

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Average rainfall in September
Banja Luka, Bosnia and Herzegovina

Average rainfall in September - Banja Luka, Bosnia and Herzegovina
  • Average rainfall in September: 44mm

The wettest month (with the highest rainfall) is May (102mm).
The driest month (with the least rainfall) is August (38mm).

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Average rainfall days in September
Banja Luka, Bosnia and Herzegovina

Average rainfall days in September - Banja Luka, Bosnia and Herzegovina
  • Average rainfall days in September: 13.2 days

The month with the highest number of rainy days is May (20.5 days).
The month with the least rainy days is January (9.8 days).

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Average snowfall in September
Banja Luka, Bosnia and Herzegovina

Average snowfall in September - Banja Luka, Bosnia and Herzegovina
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (213mm).
The months with the least snowfall are May, June, July, August and September (0mm).

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Average snowfall days in September
Banja Luka, Bosnia and Herzegovina

Average snowfall days in September - Banja Luka, Bosnia and Herzegovina
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Banja Luka, Bosnia and Herzegovina

Average daylight in September / Average sunshine in September - Banja Luka, Bosnia and Herzegovina
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

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Average sunshine days in September
Banja Luka, Bosnia and Herzegovina

Average sunshine days in September - Banja Luka, Bosnia and Herzegovina
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is August (18.5 days).
The month with the least sunshine days is May (9 days).

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Average UV index in September
Banja Luka, Bosnia and Herzegovina

Average UV index in September - Banja Luka, Bosnia and Herzegovina
  • 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).

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Average cloud cover in September
Banja Luka, Bosnia and Herzegovina

Average cloud cover in September - Banja Luka, Bosnia and Herzegovina
  • Average cloud cover in September: 32

The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 23).

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Average visibility in September
Banja Luka, Bosnia and Herzegovina

Average visibility in September - Banja Luka, Bosnia and Herzegovina
  • Average visibility in September: 9km

The months with the highest visibility are March, April, May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January and February (7km).

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Banja Luka, Bosnia and Herzegovina

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