Treviglio weather in September

In September, Treviglio sees average daytime highs of 24°C and overnight lows near 15°C, with 106 mm of rain across 9.7 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 26°C in the first days to 21°C by the end. The sky is clear or mostly clear about 47% 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 Treviglio's 3rd-clearest and 7th-windiest month. For the whole year in context, see Treviglio's year-round climate.

Daytime high
24°
4th warmest
Overnight low
15°
9th coldest
Rainfall
106 mm
9.7 wet days
Daylight
12 h 18 min
6:07 AM – 6:25 PM
Cloud cover
47%
3rd clearest
Wind
6 km/h
7th windiest
Solar energy
3.97 kWh/m²
Travel score
6.9
out of 10

Treviglio is chief town of the homonym municipality.

Air quality
Elevated
PM2.5 18.1 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 26°C in the first days to 21°C by the end.

A typical September day in Treviglio reaches about 24°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 28°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)
12617
22617
32617
42617
52616
62516
72516
82516
92516
102516
112416
122415
132415
142415
152415
162315
172315
182315
192314
202314
212214
222214
232214
242214
252214
262213
272113
282113
292113
302113

How September really feels in Treviglio

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.

Treviglio 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 / 556.61.58.91.1
Feb / 556.71.710.12.2
Mar14° / 698.50.911.64.4
Apr18° / 8911.80.113.25.6
May22° / 13°10012.2014.76.4
Jun27° / 17°9311.2015.46.4
Jul29° / 19°739.6015.15.7
Aug29° / 19°9110.4013.95.9
Sep24° / 15°1069.7012.36.9
Oct18° / 10°11210.3010.75.6
Nov12° / 12410.80.59.32.9
Dec / 717.71.78.61.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% 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 37%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17030
27030
37030
47030
57030
66931
76931
86832
96832
106733
116634
126535
136535
146436
156436
166337
176238
186238
196139
206139
216040
226040
235941
245842
255842
265743
275644
285644
295446
305347

Chance of precipitation in September

Any precipitation

Treviglio gets around 106 mm of rain over 9.7 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 33% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
134
234
333
433
533
633
733
833
933
1033
1133
1233
1333
1434
1534
1634
1734
1834
1934
2034
2134
2233
2333
2433
2533
2633
2733
2834
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 40% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
125273811
227273610
32828359
42929348
53029338
63130327
73230326
83330316
93331315
103431305
113531304
123631304
133731294
143831283
153931283
164031272
174131262
184231252
194332242
204432231
214532211
224633201
234733191
244833181
254934160
265134150
275135140
285235130
295335120
305435110

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 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
275calm
285calm
295calm
305calm

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 5:48 AM to 6:24 AM, and sunset from 6:55 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:486:55
213.15:496:53
313.05:506:51
413.05:516:49
512.95:536:47
612.95:546:45
712.85:556:43
812.75:566:41
912.75:586:39
1012.65:596:37
1112.66:006:35
1212.56:016:33
1312.56:036:31
1412.46:046:29
1512.46:056:27
1612.36:076:25
1712.36:086:23
1812.26:096:21
1912.26:106:19
2012.16:126:17
2112.06:136:15
2212.06:146:13
2311.96:156:11
2411.96:176:09
2511.86:186:07
2611.86:196:05
2711.76:216:03
2811.76:226:01
2911.66:235:59
3011.56:245:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.97 kWh/m².

For context, solar energy here swings from a low near 1.23 kWh/m² to a high of 6.32 kWh/m² in July across the year — September's 3.97 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
104.3Bright
114.2Bright
124.2Bright
134.1Bright
144.0Bright
154.0Moderate
163.9Moderate
173.9Moderate
183.8Moderate
193.8Moderate
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 Treviglio?

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

6.9
Sightseeing
1st-best month of the year
5.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Treviglio for sightseeing.

What to pack for Treviglio in September

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

In September, Treviglio sees daytime highs around 24°C and nights near 15°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

UV index in Treviglio 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 Treviglio peaks around July 15 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 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 highHighModerateLowJul 15UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr6High
May7High
Jun7Very high
Jul8Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Treviglio 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 Treviglio is worst in March — around 23 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Treviglio's WHO annual average of 18.1 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2122 µg/m³Sep 1315 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb19Moderate
Mar23Moderate
Apr21Moderate
May18Moderate
Jun20Moderate
Jul17Moderate
Aug15Moderate
Sep15Moderate
Oct16Moderate
Nov15Moderate
Dec17Moderate
Location & terrain

Where is Treviglio?

Treviglio sits at 45.5°N, 9.6°E, 125 m above sea level, in Italy. The nearest listed city is Cassano d'Adda, 6.0 km away.

Topography around Treviglio

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

Within 3 km, the terrain around Treviglio has only modest variations in elevation — a maximum elevation change of 34 m around an average of 124 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 170 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,974 m.

The land around Treviglio is covered by cropland (40%), grassland (27%) and artificial surfaces (25%) within 3 km, cropland (45%) and grassland (25%) within 16 km, and trees (35%) and cropland (35%) within 80 km.

3 km
34 m
16 km
170 m
80 km
2,974 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Cassano d'Adda 6.0 km · Romano di Lombardia 13 km · Melzo 14 km · Dalmine 14 km · Gorgonzola 15 km · Crema 19 km · Carugate 20 km · Cernusco sul Naviglio 20 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 Treviglio (45.5208°, 9.591°, elevation 125 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).