Mostar Weather in September
During September, Mostar experiences high daytime temperatures of 24°C (75°F) and cooler nights around 12°C (54°F). Expect quite a bit of rainfall. Around 140 mm (5.5 in) is typical.
Rainfall in Mostar in September
Historically, approximately 9 days this month are expected to have rain, averaging 140 mm (5.5 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Mostar in September
If you're visiting Mostar in September, expect highs of 24°C (75°F) and overnight lows around 12°C (54°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Mostar in September
Expect a lot of sunshine this month, with about 226 hours of sun. These sunny conditions add to the overall experience.If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Mostar.
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 Mostar's climate page.
Mostar Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
24°C (75°F)
Chance of Rain
31%
Precipitation
140 mm (5.5 in)
Rainy days
9 days
Humidity
61%
Sunshine
226 hours
Percentage Sunshine
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Mostar typically drop from around 28°C (82°F) at the start of September to approximately 24°C (75°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 14°C (57°F).
Average temperatures in September
Daily Historical Precipitation
49-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 Mostar in September
Browse day-by-day weather records for Mostar spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mostar historical weather extremes in September
Based on 30 years of weather observations (1995-2025), these are the most extreme conditions recorded in Mostar.
- The warmest day in September was on September 2, 2024, with a maximum of 38°C (100°F).
- Mostar registered its coldest September night on September 6, 2000, with temperatures dropping to 2°C (36°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
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What to Wear in Mostar 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Mostar 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 Mostar's climate page.
Temperature Rainfall Sunshine Humidity
See the full Mostar climate overview or explore weather in Bosnia and Herzegovina.
