Trebinje weather in September

In September, Trebinje sees average daytime highs of 22°C and overnight lows near 15°C, with 133 mm of rain across 9.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 20°C by the end. The sky is clear or mostly clear about 54% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Trebinje's 4th-clearest and 8th-windiest month. For the whole year in context, see Trebinje's year-round climate.

Daytime high
22°
4th warmest
Overnight low
15°
9th coldest
Rainfall
133 mm
9.1 wet days
Daylight
12 h 18 min
5:32 AM – 5:50 PM
Cloud cover
41%
4th clearest
Wind
9 km/h
8th windiest
Solar energy
4.58 kWh/m²
Travel score
7.1
out of 10

Trebinje is city in Bosnia and Herzegovina.

Density
39/km²
people per km²
Founded
2012

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 24°C in the first days to 20°C by the end.

A typical September day in Trebinje reaches about 22°C in the afternoon and slips back to 15°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 26°C. Set against its neighbours, September runs about 4°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12517
22417
32417
42416
52416
62416
72316
82316
92316
102316
112315
122315
132315
142215
152215
162215
172215
182215
192215
202114
212114
222114
232114
242114
252114
262114
272014
282013
292013
302013

How September really feels in Trebinje

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Trebinje weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 15711.23.39.21.2
Feb / 15210.93.410.31.6
Mar12° / 14111.32.411.63.0
Apr15° / 13913.40.613.14.2
May19° / 12°9811.5014.46.1
Jun23° / 16°608.5015.17.4
Jul26° / 18°446.9014.87.8
Aug26° / 18°496.6013.77.7
Sep22° / 15°1339.1012.37.1
Oct18° / 11°19410.8010.85.9
Nov13° / 24913.20.69.63.5
Dec / 20613.12.18.91.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 29%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27921
37822
47723
57624
67624
77525
87525
97426
107426
117327
127327
137228
147129
157129
167030
177030
186931
196931
206832
216832
226634
236634
246634
256535
266535
276535
286436
296436
306436

Chance of precipitation in September

Any precipitation

Trebinje gets around 133 mm of rain over 9.1 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
228
328
429
529
630
730
830
930
1031
1131
1231
1331
1431
1530
1630
1730
1830
1930
2030
2130
2230
2331
2431
2531
2632
2732
2833
2934
3034

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 41% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12431422
22532412
32732392
42833372
53033361
63134341
73235321
83336311
93437291
103538270
113638260
123639240
133739230
143840220
153940210
164140190
174240180
184340170
194539160
204639150
214838140
225038130
235137120
245236120
255336110
265535100
275535100
28563590
29563590
30573580

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:16 AM to 5:48 AM, and sunset from 6:17 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:166:17
213.05:176:15
312.95:186:13
412.95:196:12
512.85:206:10
612.85:216:08
712.75:226:06
812.75:246:04
912.65:256:02
1012.65:266:01
1112.55:275:59
1212.55:285:57
1312.45:295:55
1412.45:305:53
1512.35:315:51
1612.35:325:50
1712.25:345:48
1812.25:355:46
1912.15:365:44
2012.15:375:42
2112.05:385:40
2212.05:395:38
2311.95:405:37
2411.95:415:35
2511.85:425:33
2611.85:445:31
2711.75:455:29
2811.75:465:27
2911.65:475:25
3011.65:485:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.58 kWh/m².

For context, solar energy here swings from a low near 1.49 kWh/m² to a high of 6.92 kWh/m² in July across the year — September's 4.58 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.2Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Trebinje?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.1
Sightseeing
4th-best month of the year
5.0
Beach & pool
4th-best month of the year

September is one of the better times to visit Trebinje for general sightseeing.

What to pack for Trebinje in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Trebinje sees daytime highs around 22°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Trebinje in September

The nearest coast averages about 24°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 20 km away) is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from May 28 to Oct 28 — about 5.1 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May19Cool
Jun23Refreshing
Jul25Warm
Aug26Warm
Sep24Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Trebinje in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Trebinje peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highModerateLowJul 17UV 9Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5High
Apr7Very high
May7Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Trebinje?

Trebinje sits at 42.7°N, 18.3°E, 278 m above sea level, in Bosnia and Herzegovina. The nearest listed city is Dubrovnik, 21 km away.

DubrovnikHerceg NoviPerastTivatKotorNikšić

Topography around Trebinje

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Trebinje.

Within 3 km, the terrain around Trebinje has large variations in elevation — a maximum elevation change of 680 m around an average of 434 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,536 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,429 m.

The land around Trebinje is covered by grassland (34%), shrubs (23%) and trees (20%) within 3 km, trees (53%), grassland (22%) and shrubs (20%) within 16 km, and trees (41%), water (28%) and grassland (23%) within 80 km.

3 km
680 m
16 km
1,536 m
80 km
2,429 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Dubrovnik 21 km · Herceg Novi 33 km · Perast 38 km · Tivat 42 km · Kotor 48 km · Nikšić 50 km · Cetinje 59 km · Budva 62 km

Bosnia and Herzegovina travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 40% of US
price level, 2025
GDP per capita
$10,382
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
86%
of population, 2024
Homicide rate
1.2
per 100k, 2023
Road deaths
13.5
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 591
Religion
Muslim 51%Orthodox 31%Roman Catholic 15%other 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Trebinje (42.712°, 18.3436°, elevation 278 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).