Trebinje Weather in September
September in Trebinje brings high temperatures, with highs of 23°C (73°F) and nights dropping to 14°C (57°F). Rainfall is on the higher side this month, averaging around 137 mm (5.4 in), so keep a rain jacket handy.
Rainfall in Trebinje in September
The climate data from previous years indicates about 9 days of rain, averaging 137 mm (5.4 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Trebinje in September
Expect highs of 23°C (73°F) in Trebinje in September, with nights dropping to around 14°C (57°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Trebinje in September
There are approximately 310 hours of sunshine this month, resulting in mostly clear days.
Average water temperature in September
The water temperature is 24°C (75°F), which most people find very comfortable. A good month for swimming and water sports.If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 Trebinje's climate page.
Trebinje Temperature in September
Min Temperature
14°C (57°F)
Max Temperature
23°C (73°F)
Water Temperature
24°C (75°F) *
Chance of Rain
29%
Precipitation
137 mm (5.4 in)
Rainy days
9 days
Humidity
59% *
Sunshine
310 hours *
Percentage Sunshine
70% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Trebinje typically drop from around 27°C (81°F) at the start of September to approximately 23°C (73°F) by the end. Nights are pleasant, with lows typically ranging from 15°C (59°F) to 19°C (66°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 Trebinje in September
Browse day-by-day weather records for Trebinje spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Trebinje historical weather extremes in September
Based on weather observations in Trebinje between 1976 and 2025, these are the recorded extremes during September.
- On September 18, 2015, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- On September 18, 2001, Trebinje saw its coldest September day with temperatures maxing out at 16°C (61°F).
- Nighttime temperatures dropped to 6°C (43°F) on September 30, 1995, marking the coldest September night on record.
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
pleasant
tolerable
unpleasant
poor
What to Wear in Trebinje in September
For Trebinje in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 24°C (75°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Trebinje 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 Trebinje's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Trebinje climate overview or explore weather in Bosnia and Herzegovina.
