Banja Luka Weather in September
September in Banja Luka averages 23°C (73°F) during the day and 11°C (52°F) at night. Quite a bit of rainfall is typical this month, with around 101 mm (4 in) on average. An umbrella is a good idea.
Rainfall in Banja Luka in September
Historically, approximately 11 days this month are expected to have rain, averaging 101 mm (4 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Banja Luka in September
Banja Luka in September gets highs of 23°C (73°F) during the day and drops to 11°C (52°F) at night. This kind of day-to-night contrast is typical for this time of year. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Banja Luka in September
The area enjoys a balanced 189 hours of sunlight, ensuring it's neither too overcast nor too sunny.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Banja Luka.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Bosnia and Herzegovina, check out our Banja Luka's climate page.
Banja Luka Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
23°C (73°F)
Chance of Rain
36%
Precipitation
101 mm (4 in)
Rainy days
11 days
Humidity
77%
Sunshine
189 hours
Percentage Sunshine
56%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Banja Luka typically drop from around 25°C (77°F) at the start of September to approximately 21°C (70°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 13°C (55°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Banja Luka in September
Browse day-by-day weather records for Banja Luka spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Banja Luka historical weather extremes in September
Our historical data for Banja Luka spans 1993 to 2025, revealing these weather extremes.
- The warmest day in September was on September 17, 2015, with a maximum of 40°C (104°F).
- On September 29, 1995, Banja Luka saw its coldest September day with temperatures maxing out at 10°C (50°F).
- The coldest night in September in Banja Luka was on September 26, 2018, with a minimum of 1°C (34°F).
Best Places in Bosnia and Herzegovina in September
Find out more about the weather in Bosnia and Herzegovina and which places have the best travel conditions in this month. See all of Bosnia and Herzegovina in September →
perfect weather
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tolerable
unpleasant
poor
What to Wear in Banja Luka in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Banja Luka in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Bosnia and Herzegovina, check out our Banja Luka's climate page.
Temperature Rainfall Sunshine Humidity
See the full Banja Luka climate overview or explore weather in Bosnia and Herzegovina.
