Weather in Banja Luka for September 2025
Until now, September 2025 in Banja Luka is slightly cooler than the historical average by -0.7 °C.
The forecast for the next days in Banja Luka predicts a temperature of 22.7 °C, which is cooler than the historical average.
In general, the average temperature in Banja Luka at the beginning of September is 29.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.4 °C by the end of September.
The climate of Banja Luka in September is notably wet, with an average of 15 rainy days, and a total of 124.3 mm of precipitation.
Temperatures
Rain 🌧️
Banja Luka Weather September
Temperatures trend during September in Banja Luka
September weather in Banja Luka day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 30° /13° | 0 mm | 7 | |
| 2 Sept. | Sunny | 32° /14° | 0 mm | 8 | |
| 3 Sept. | Sunny | 28° /14° | 0.9 mm | 6 | |
| 4 Sept. |  Light rain shower | 30° /13° | 0.7 mm | 7 | |
| 5 Sept. |  Partly cloudy | 30° /12° | 1 mm | 7 | |
| 6 Sept. | Sunny | 27° /11° | 0.9 mm | 6 | |
| 7 Sept. | Sunny | 29° /12° | 0 mm | 7 | |
| 8 Sept. | Sunny | 32° /13° | 0.5 mm | 8 | |
| 9 Sept. | Sunny | 28° /13° | 3.1 mm | 7 | |
| 10 Sept. | Sunny | 27° /12° | 0.4 mm | 6 | |
| 11 Sept. | Sunny | 29° /12° | 0.9 mm | 7 | |
| 12 Sept. | Patchy rain possible | 30° /11° | 0.5 mm | 7 | |
| 13 Sept. | Partly cloudy | 22° /10° | 10.5 mm | 5 | |
| 14 Sept. | Partly cloudy | 22° /11° | 3.6 mm | 5 | |
| 15 Sept. |  Mist | 21° /10° | 7.4 mm | 5 | |
| 16 Sept. | Partly cloudy | 19° /8° | 10.4 mm | 5 | |
| 17 Sept. | Patchy rain possible | 21° /12° | 1.2 mm | 1.1 | |
| 18 Sept. | Sunny | 24° /12° | 0 mm | 1.4 | |
| 19 Sept. | Sunny | 27° /14° | 0 mm | 1.4 | |
| 20 Sept. | Sunny | 29° /14° | 0 mm | 1.7 | |
| 21 Sept. | Sunny | 31° /16° | 0 mm | 5 | |
| 22 Sept. | Sunny | 32° /16° | 0 mm | 6 | |
| 23 Sept. | Partly cloudy | 29° /16° | 0.1 mm | 6 | |
| 24 Sept. | Patchy rain possible | 27° /16° | 0.1 mm | 5 | |
| 25 Sept. | Patchy rain possible | 22° /12° | 0.1 mm | 4 | |
| 26 Sept. | Patchy rain possible | 15° /11° | 1.1 mm | 3 | |
| 27 Sept. | Patchy rain possible | 11° /9° | 0.4 mm | 3 | |
| 28 Sept. | Patchy rain possible | 11° /10° | 0.1 mm | 3 | |
| 29 Sept. | Partly cloudy | 16° /7° | 0 mm | 4 | |
| 30 Sept. | Partly cloudy | 20° /6° | 0 mm | 6 | |
| Next | |||||
Guide for Banja Luka in September
In Banja Luka, Bosnia and Herzegovina, September marks the transition from summer to autumn, bringing about noticeable changes in the weather.
At the beginning of the month, the weather in Banja Luka is generally warm and pleasant, with average daytime temperatures around 24° and occasional showers.
As the month progresses, the temperatures gradually begin to decrease, and by the end of September, the weather becomes cooler with average daytime temperatures around 18°. The evenings and nights tend to be cooler, with temperatures dropping to around 10° towards the end of the month.
The weather in Banja Luka during September is characterized by decreasing daylight hours and a gradual shift towards autumnal conditions.
Travelers visiting Banja Luka during this time can expect comfortable weather for outdoor activities at the beginning of the month, while towards the end, they may need to pack some warmer clothing for the cooler evenings.
Overall, September in Banja Luka offers a pleasant transition from summer to autumn, allowing visitors to enjoy the changing colors of the surrounding nature and the cultural attractions of the city.
Banja Luka in September - FAQ
September rainfall patterns in Banja Luka
UV exposure in Banja Luka during September
Quick links
Where is Banja Luka?Get accurate weather forecasts for Banja Luka, located at latitude 44.778 and longitude 17.194. Stay updated with localized weather information tailored for Banja Luka.