Herceg Novi weather in September

In September, Herceg Novi sees average daytime highs of 22°C and overnight lows near 16°C, with 123 mm of rain across 9.3 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 55% 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 Herceg Novi's 4th-clearest and 9th-windiest month. For the whole year in context, see Herceg Novi's year-round climate.

Daytime high
22°
4th warmest
Overnight low
16°
9th coldest
Rainfall
123 mm
9.3 wet days
Daylight
12 h 18 min
5:32 AM – 5:49 PM
Cloud cover
40%
4th clearest
Wind
8 km/h
9th windiest
Solar energy
4.56 kWh/m²
Travel score
7.1
out of 10

Herceg Novi is city in Montenegro.

Density
83/km²
people per km²
Founded
1382

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 Herceg Novi reaches about 22°C in the afternoon and slips back to 16°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)
12417
22417
32417
42417
52417
62417
72317
82316
92316
102316
112316
122316
132316
142216
152216
162215
172215
182215
192215
202115
212115
222115
232115
242114
252114
262114
272014
282014
292014
302014

How September really feels in Herceg Novi

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.

Herceg Novi 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 / 1521129.21.4
Feb / 15211.32.410.31.7
Mar12° / 145121.411.63.0
Apr15° / 14113.40.413.14.2
May19° / 13°10312.4014.46.0
Jun23° / 16°578.90157.4
Jul26° / 19°376014.88.0
Aug26° / 19°466.8013.77.8
Sep22° / 16°1239.3012.37.1
Oct18° / 12°18510.5010.85.9
Nov13° / 25212.90.29.63.6
Dec / 20412.81.48.91.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% 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 29%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28020
37921
47822
57723
67624
77624
87525
97426
107327
117327
127228
137228
147129
157129
167030
177030
186931
196931
206832
216832
226733
236733
246634
256634
266535
276535
286535
296436
306337

Chance of precipitation in September

Any precipitation

Herceg Novi gets around 123 mm of rain over 9.3 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 31% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
127
228
328
429
529
630
730
830
931
1031
1131
1231
1331
1431
1531
1631
1731
1831
1931
2031
2131
2231
2332
2432
2532
2632
2733
2833
2934
3035

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 37% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
12227466
22427445
32528434
42629414
52730403
62831393
72932372
83033362
93134341
103135331
113236311
123237301
133338281
143439271
153539260
163640240
173740230
183840210
193941200
204140190
214240180
224440170
234539160
244639150
254739140
264838130
274938120
285038120
295039110
305139100

Wind in September

Winds average 8 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 5:15 AM to 5:47 AM, and sunset from 6:16 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:156:16
213.05:166:14
312.95:176:12
412.95:196:11
512.85:206:09
612.85:216:07
712.75:226:05
812.75:236:03
912.65:246:02
1012.65:256:00
1112.55:265:58
1212.55:275:56
1312.45:285:54
1412.45:295:52
1512.35:315:51
1612.35:325:49
1712.25:335:47
1812.25:345:45
1912.15:355:43
2012.15:365:41
2112.05:375:39
2212.05:385:38
2311.95:395:36
2411.95:415:34
2511.85:425:32
2611.85:435:30
2711.75:445:28
2811.75:455:27
2911.65:465:25
3011.65:475:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.56 kWh/m².

For context, solar energy here swings from a low near 1.49 kWh/m² to a high of 6.91 kWh/m² in July across the year — September's 4.56 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.2Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
94.9Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.0Bright
264.0Bright
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Herceg Novi?

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 Herceg Novi for general sightseeing.

What to pack for Herceg Novi in September

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

In September, Herceg Novi sees daytime highs around 22°C and nights near 16°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Herceg Novi 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 offshore is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from May 26 to Oct 29 — about 5.2 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 Herceg Novi 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 Herceg Novi 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
Apr7High
May7High
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Herceg Novi?

Herceg Novi sits at 42.5°N, 18.5°E, 87 m above sea level, in Montenegro. The nearest listed city is Tivat, 13 km away.

TivatPerastKotorBudvaCetinjeTrebinjeBečići

Topography around Herceg Novi

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

Within 3 km, the terrain around Herceg Novi has large variations in elevation — a maximum elevation change of 761 m around an average of 119 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,882 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,184 m.

The land around Herceg Novi is covered by water (43%) and trees (42%) within 3 km, water (43%) and trees (41%) within 16 km, and trees (40%) and water (34%) within 80 km.

3 km
761 m
16 km
1,882 m
80 km
2,184 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Tivat 13 km · Perast 14 km · Kotor 19 km · Budva 31 km · Cetinje 32 km · Trebinje 33 km · Bečići 33 km · Dubrovnik 41 km

Montenegro travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 42% of US
price level, 2025
GDP per capita
$14,817
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
86%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
7.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
Religion
Orthodox 72%Muslim 19%Catholic 3%other 2%

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 Herceg Novi (42.4531°, 18.5375°, elevation 87 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).