Bijeljina weather in September

In September, Bijeljina sees average daytime highs of 24°C and overnight lows near 13°C, with 57 mm of rain across 8.8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 22°C by the end. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Bijeljina's 3rd-clearest and 10th-windiest month. For the whole year in context, see Bijeljina's year-round climate.

Daytime high
24°
4th warmest
Overnight low
13°
9th coldest
Rainfall
57 mm
8.8 wet days
Daylight
12 h 18 min
5:28 AM – 5:47 PM
Cloud cover
52%
3rd clearest
Wind
8 km/h
10th windiest
Solar energy
3.93 kWh/m²
Travel score
7.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 22°C by the end.

A typical September day in Bijeljina reaches about 24°C in the afternoon and slips back to 13°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 30°C. Set against its neighbours, September runs about 5°C cooler than August and about 6°C warmer than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
12715
22615
32614
42614
52614
62614
72514
82514
92514
102513
112513
122513
132413
142413
152413
162413
172412
182312
192312
202312
212312
222312
232312
242212
252211
262211
272211
282211
292211
302211

How September really feels in Bijeljina

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.

Bijeljina weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°509.64.890.0
Feb / -1°499.54.210.11.1
Mar13° / 5710.4211.63.6
Apr18° / 6310.20.313.25.7
May23° / 12°7912.4014.66.5
Jun27° / 15°7611.4015.36.4
Jul29° / 17°689.70155.9
Aug29° / 17°528.1013.96.1
Sep24° / 13°578.8012.37.1
Oct18° / 547.7010.76.2
Nov12° / 558.92.19.43.1
Dec / -1°579.53.78.70.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 43%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16535
26535
36436
46337
56238
66238
76139
86040
95941
105842
115842
125743
135644
145545
155545
165545
175545
185446
195446
205347
215347
225248
235248
245347
255347
265347
275446
285446
295446
305446

Chance of precipitation in September

Any precipitation

Bijeljina gets around 57 mm of rain over 8.8 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 29% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
228
328
428
528
628
728
829
929
1029
1129
1229
1330
1430
1530
1630
1730
1830
1930
2030
2130
2230
2330
2430
2529
2629
2728
2828
2927
3027

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 56% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13735253
23935242
34135232
44235222
54335201
64435191
74535191
84635181
94735170
104835160
114935160
125035150
135135140
145334130
155334130
165533120
175633110
185832100
19593290
20603190
21623080
22642970
23662860
24672760
25692650
26712540
27712540
28732430
29742330
30742330

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min 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 90 minutes over September. Sunrise moves from 5:10 AM to 5:46 AM, and sunset from 6:16 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:106:16
213.05:116:14
313.05:126:12
412.95:146:10
512.95:156:08
612.85:166:06
712.85:176:04
812.75:196:02
912.75:206:00
1012.65:215:58
1112.65:225:56
1212.55:235:55
1312.55:255:53
1412.45:265:51
1512.45:275:49
1612.35:285:47
1712.35:295:45
1812.25:315:43
1912.15:325:41
2012.15:335:39
2112.05:345:37
2212.05:365:35
2311.95:375:33
2411.95:385:31
2511.85:395:29
2611.85:415:27
2711.75:425:25
2811.75:435:23
2911.65:445:21
3011.65:465:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.93 kWh/m².

For context, solar energy here swings from a low near 1.19 kWh/m² to a high of 6.02 kWh/m² in July across the year — September's 3.93 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.5Bright
54.5Bright
64.4Bright
74.3Bright
84.3Bright
94.3Bright
104.2Bright
114.2Bright
124.1Bright
134.0Bright
144.0Bright
154.0Moderate
163.9Moderate
173.9Moderate
183.8Moderate
193.8Moderate
203.7Moderate
213.7Moderate
223.6Moderate
233.6Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.4Moderate
283.4Moderate
293.4Moderate
303.3Moderate
Planning a trip in September

Is September a good time to visit Bijeljina?

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

7.1
Sightseeing
1st-best month of the year
5.9
Beach & pool
4th-best month of the year

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

What to pack for Bijeljina in September

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

In September, Bijeljina sees daytime highs around 24°C and nights near 13°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Bijeljina in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bijeljina peaks around July 17 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 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 8Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar5Moderate
Apr7High
May6High
Jun8Very high
Jul8Very high
Aug8Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Bijeljina in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Bijeljina is worst in June — around 16 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1416 µg/m³Dec 1611 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb12Moderate
Mar16Moderate
Apr16Moderate
May15Moderate
Jun16Moderate
Jul14Moderate
Aug14Moderate
Sep12Moderate
Oct14Moderate
Nov12Good
Dec10Good
Location & terrain

Where is Bijeljina?

Bijeljina sits at 44.8°N, 19.2°E, 91 m above sea level, in Bosnia and Herzegovina. The nearest listed city is Loznica, 25 km away.

LoznicaBrčkoŠabacSremska MitrovicaTuzlaRumaBačka PalankaLukavac

Topography around Bijeljina

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

Within 3 km, the terrain around Bijeljina has only modest variations in elevation — a maximum elevation change of 21 m around an average of 92 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 203 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,465 m.

The land around Bijeljina is covered by cropland (51%) and artificial surfaces (33%) within 3 km, cropland (60%) and trees (26%) within 16 km, and trees (48%) and cropland (39%) within 80 km.

3 km
21 m
16 km
203 m
80 km
1,465 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Loznica 25 km · Brčko 34 km · Šabac 38 km · Sremska Mitrovica 40 km · Tuzla 50 km · Ruma 55 km · Bačka Palanka 56 km · Lukavac 60 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 Bijeljina (44.7587°, 19.2144°, elevation 91 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).