Nova Gorica weather in September

In September, Nova Gorica sees average daytime highs of 20°C and overnight lows near 12°C, with 181 mm of rain across 12.8 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 18°C by the end. The sky is clear or mostly clear about 34% 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 30 min by month's end. Set against the rest of the year, September is Nova Gorica's 4th-clearest and 8th-windiest month. For the whole year in context, see Nova Gorica's year-round climate.

Daytime high
20°
4th warmest
Overnight low
12°
9th coldest
Rainfall
181 mm
12.8 wet days
Daylight
12 h 18 min
5:50 AM – 6:09 PM
Cloud cover
55%
4th clearest
Wind
6 km/h
8th windiest
Solar energy
3.75 kWh/m²
Travel score
5.9
out of 10

Nova Gorica is city in Western Slovenia.

Air quality
Moderate
PM2.5 12.8 µg/m³ · 2019
Density
42/km²
people per km²

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 22°C in the first days to 18°C by the end.

A typical September day in Nova Gorica reaches about 20°C in the afternoon and slips back to 12°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 25°C. Set against its neighbours, September runs about 5°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12314
22314
32214
42213
52213
62213
72213
82113
92113
102113
112112
122112
132112
142012
152012
162012
172012
182011
191911
201911
211911
221911
231911
241911
251811
261810
271810
281810
291810
301810

How September really feels in Nova Gorica

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.

Nova Gorica weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°1089.84.18.90.0
Feb / -1°1149.63.8100.5
Mar10° / 12311.42.611.62.4
Apr15° / 14014.20.913.34.0
May19° / 10°15916014.75.3
Jun23° / 14°14814.6015.56.1
Jul25° / 16°12613.6015.26.5
Aug25° / 16°13713.10146.5
Sep20° / 12°18112.8012.35.9
Oct15° / 18412.60.310.74.3
Nov10° / 20913.21.49.31.9
Dec / -0°14110.138.50.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25743
35743
45644
55644
65743
75644
85644
95644
105545
115644
125644
135545
145545
155446
165446
175347
185347
195347
205248
215248
225149
235050
245050
254951
264852
274753
284654
294456
304456

Chance of precipitation in September

Any precipitation

Nova Gorica gets around 181 mm of rain over 12.8 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 44% and peaks near 45% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
143
243
343
443
543
644
744
844
944
1044
1144
1245
1345
1445
1544
1644
1744
1844
1944
2043
2143
2243
2343
2443
2543
2643
2743
2844
2944
3045

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 (%)
13438271
23638251
33738241
43938231
54038211
64238201
74338190
84438180
94637170
104737160
114837150
125036140
135136130
145335120
155534110
165633110
175832100
18613090
19632980
20642880
21662770
22672760
23682660
24702550
25712540
26712540
27732430
28732430
29742420
30742420

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 96 minutes over September. Sunrise moves from 5:31 AM to 6:08 AM, and sunset from 6:39 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:316:39
213.15:326:37
313.05:336:35
413.05:356:33
512.95:366:32
612.95:376:30
712.85:396:28
812.85:406:26
912.75:416:24
1012.75:426:21
1112.65:446:19
1212.55:456:17
1312.55:466:15
1412.45:486:13
1512.45:496:11
1612.35:506:09
1712.35:516:07
1812.25:536:05
1912.25:546:03
2012.15:556:01
2112.05:575:59
2212.05:585:57
2311.95:595:55
2411.96:015:53
2511.86:025:51
2611.86:035:49
2711.76:045:47
2811.76:065:45
2911.66:075:43
3011.56:085:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.75 kWh/m².

For context, solar energy here swings from a low near 1.1 kWh/m² to a high of 6.13 kWh/m² in July across the year — September's 3.75 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.2Bright
74.2Bright
84.1Bright
94.1Bright
104.0Bright
114.0Moderate
123.9Moderate
133.9Moderate
143.8Moderate
153.8Moderate
163.7Moderate
173.6Moderate
183.6Moderate
193.5Moderate
203.5Moderate
213.5Moderate
223.4Moderate
233.4Moderate
243.3Moderate
253.3Moderate
263.2Moderate
273.1Moderate
283.1Moderate
293.0Moderate
303.0Moderate
Planning a trip in September

Is September a good time to visit Nova Gorica?

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

5.9
Sightseeing
4th-best month of the year
3.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Nova Gorica for sightseeing.

What to pack for Nova Gorica in September

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

In September, Nova Gorica sees daytime highs around 20°C and nights near 12°C. Worth packing: rain gear. About 13 days see rain.

rain gear

Sea temperature near Nova Gorica in September

The nearest coast averages about 23°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 37 km away) is warmest in August at about 25°C and coldest in February near 10°C.

It's comfortable for a long swim from May 31 to Oct 9 — about 4.3 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan11Bracing
Feb10Bracing
Mar10Bracing
Apr13Bracing
May18Cool
Jun23Refreshing
Jul25Warm
Aug25Warm
Sep23Refreshing
Oct19Cool
Nov16Cool
Dec13Bracing

UV index in Nova Gorica 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 Nova Gorica peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 15UV 8Jan 10UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr7High
May6High
Jun8Very high
Jul8Very high
Aug7Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Nova Gorica 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 Nova Gorica is worst in January — around 17 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (September, 9 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Nova Gorica's WHO annual average of 12.8 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJan 1817 µg/m³Sep 149 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb15Moderate
Mar15Moderate
Apr14Moderate
May12Moderate
Jun12Moderate
Jul12Moderate
Aug10Good
Sep9Good
Oct11Good
Nov11Good
Dec14Moderate
Location & terrain

Where is Nova Gorica?

Nova Gorica sits at 46.0°N, 13.6°E, 0 m above sea level, in Slovenia. The nearest listed city is Gorizia, 3.0 km away.

MonfalconeUdineTriesteDivačaBohinjKoperPiran

Topography around Nova Gorica

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

Within 3 km, the terrain around Nova Gorica has large variations in elevation — a maximum elevation change of 601 m around an average of 147 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,433 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,763 m.

The land around Nova Gorica is covered by trees (68%) within 3 km, trees (73%) within 16 km, and trees (56%) within 80 km.

3 km
601 m
16 km
1,433 m
80 km
2,763 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Gorizia 3.0 km · Monfalcone 19 km · Udine 34 km · Trieste 36 km · Divača 39 km · Bohinj 42 km · Koper 46 km · Piran 48 km

Slovenia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 63% of US
price level, 2025
GDP per capita
$37,376
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
Religion
Catholic 69%atheist 14%Orthodox 4%non-believer/agnostic 4%

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 Nova Gorica (45.956°, 13.6484°, elevation 0 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. 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).