Weather in Banja Luka in September 2025
Average weather
Average temperature in Banja Luka in September
Going from a maximum of +91°F during the day to a minimum of +50°F during the night, the temperature in September averages around +81°F.
The average maximum temperature goes down 9% by the end of the month, compared with the beginning of the month, from +82°F to +79°F.
Is Banja Luka warm or cold in September?
Banja Luka is typically warm in September.
Maximum temperatures go down compared to the previous month from +82°F to +73°F. The minimum temperature also goes down from +61°F to +54°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Banja Luka:
Climate in Banja Luka in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +82°F | +73°F | +64°F | ||||
| Min. temperature | ||||||
| +46°F | +34°F | +23°F | ||||
| Max. temperature | ||||||
| +106°F | +102°F | +86°F | ||||
| Rainfall | ||||||
| 77 mm | 91 mm | 77 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 74% | 78% | 82% | ||||
| Air pressure | ||||||
| 1014 HPa | 1016 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 10 | 8 | 6 | ||||
| Cloudy days | ||||||
| 6 | 8 | 12 | ||||
| Rainy days | ||||||
| 13 | 13 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting colder in September. From +82°F in the day, the average maximum temperature lowers to +73°F. Prepare for more rain. Average rainfall goes from 77 mm to 91 mm. Humidity rises from 74% to 78%. The average wind speed doesn’t change much during September, staying around 1 m/s. The days becoming less sunny, going from 10 sunny days in August to 8 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 1 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Banja Luka is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Banja Luka?
Climate Change Over the Years
The climate in Banja Luka in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1996 (+59°F) and the highest in 2022 (+67°F). The driest year was 2011 with only 555 mm of rainfall, and the wettest year was 2014 with 1470 mm.
FAQ
Is September a good time to visit Banja Luka?
Can you sunbathe in Banja Luka in September?
Is Banja Luka rainy in September?
Is it sunny in Banja Luka in September?
Other cities in Bosnia and Herzegovina
Monthly weather in Banja Luka
Source of the data
For this page, we’ve looked at the typical weather in Banja Luka, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.