Monfalcone weather in September

In September, Monfalcone sees average daytime highs of 22°C and overnight lows near 18°C, with 170 mm of rain across 10.4 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 24°C in the first days to 20°C by the end. The sky is clear or mostly clear about 45% 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 Monfalcone's 4th-clearest and 7th-windiest month. For the whole year in context, see Monfalcone's year-round climate.

Daytime high
22°
4th warmest
Overnight low
18°
9th coldest
Rainfall
170 mm
10.4 wet days
Daylight
12 h 18 min
5:51 AM – 6:10 PM
Cloud cover
47%
4th clearest
Wind
11 km/h
7th windiest
Solar energy
3.96 kWh/m²
Travel score
6.8
out of 10

Monfalcone is chief town of the homonym municipality.

Air quality
Moderate
PM2.5 12.3 µg/m³ · 2019

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 Monfalcone reaches about 22°C in the afternoon and slips back to 18°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 25°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12420
22420
32420
42419
52419
62319
72319
82319
92319
102319
112318
122318
132218
142218
152218
162218
172218
182218
192217
202117
212117
222117
232117
242117
252117
262017
272016
282016
292016
302016

Monfalcone 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 / 919.60.68.91.3
Feb / 918.4110.11.6
Mar11° / 9390.411.63.0
Apr15° / 11°9710.50.113.34.4
May19° / 15°10510.6014.76.2
Jun24° / 19°879.4015.57.2
Jul26° / 21°637.2015.27.5
Aug26° / 22°907.4013.97.4
Sep22° / 18°17010.4012.36.8
Oct18° / 14°19512.6010.75.4
Nov13° / 10°20113.40.39.33.3
Dec / 12710.30.88.51.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% 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 38%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16733
26832
36832
46832
56733
66733
76832
86733
96733
106634
116634
126535
136634
146535
156337
166337
176238
186139
196040
205941
215941
225842
235842
245743
255644
265545
275545
285446
295347
305347

Chance of precipitation in September

Any precipitation

Monfalcone gets around 170 mm of rain over 10.4 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 35% and peaks near 42% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
130
230
331
431
531
632
732
833
933
1034
1134
1235
1335
1435
1536
1636
1736
1837
1937
2037
2137
2237
2337
2438
2538
2639
2739
2840
2941
3042

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 33% of days. Sticky, muggy-or-worse air turns up on roughly 12% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1192330243
2202330233
3212431222
4222431212
5232531201
6242531191
7252532181
8252532170
9262532170
10272532160
11282532150
12292532140
13302532130
14312432130
15322532120
16332531110
17342530100
1836262990
1937262990
2038272880
2139272770
2240282760
2341282650
2441292640
2542292640
2642292530
2743292530
2843292520
2944292520
3044292520

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm

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 5:32 AM to 6:09 AM, and sunset from 6:40 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:326:40
213.15:336:38
313.05:346:36
413.05:356:34
512.95:376:32
612.95:386:30
712.85:396:28
812.85:406:26
912.75:426:24
1012.65:436:22
1112.65:446:20
1212.55:466:18
1312.55:476:16
1412.45:486:14
1512.45:496:12
1612.35:516:10
1712.35:526:08
1812.25:536:06
1912.25:556:04
2012.15:566:02
2112.05:576:00
2212.05:585:58
2311.96:005:56
2411.96:015:54
2511.86:025:52
2611.86:045:49
2711.76:055:47
2811.76:065:45
2911.66:085:43
3011.56:095:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.96 kWh/m².

For context, solar energy here swings from a low near 1.16 kWh/m² to a high of 6.34 kWh/m² in July across the year — September's 3.96 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.4Bright
84.4Bright
94.3Bright
104.2Bright
114.2Bright
124.1Bright
134.1Bright
144.0Bright
154.0Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.6Moderate
233.5Moderate
243.5Moderate
253.4Moderate
263.4Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Monfalcone?

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

6.8
Sightseeing
4th-best month of the year
4.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Monfalcone for sightseeing.

What to pack for Monfalcone in September

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

In September, Monfalcone sees daytime highs around 22°C and nights near 18°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

Sea temperature near Monfalcone 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 21 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 Monfalcone 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 Monfalcone 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 Monfalcone 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 Monfalcone is worst in January — around 16 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (September, 9 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Monfalcone's WHO annual average of 12.3 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJan 1816 µg/m³Sep 149 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb14Moderate
Mar15Moderate
Apr14Moderate
May12Good
Jun12Good
Jul12Good
Aug10Good
Sep9Good
Oct10Good
Nov10Good
Dec13Moderate
Location & terrain

Where is Monfalcone?

Monfalcone sits at 45.8°N, 13.5°E, 7 m above sea level, in Italy. The nearest listed city is Gorizia, 17 km away.

Topography around Monfalcone

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

Within 3 km, the terrain around Monfalcone has only modest variations in elevation — a maximum elevation change of 140 m around an average of 20 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 642 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,763 m.

The land around Monfalcone is covered by trees (40%) and artificial surfaces (30%) within 3 km, trees (34%), water (23%) and cropland (21%) within 16 km, and trees (50%) within 80 km.

3 km
140 m
16 km
642 m
80 km
2,763 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Gorizia 17 km · Nova Gorica 19 km · Trieste 26 km · Piran 31 km · Koper 32 km · Divača 36 km · Udine 37 km · Postojna 53 km

Italy travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
230 V · 50 Hz
Prices
≈ 69% of US
price level, 2025
GDP per capita
$43,309
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 513
Religion
Christian 81%unaffiliated 13%Muslim 5%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 Monfalcone (45.8046°, 13.5329°, elevation 7 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).