Como weather in September

In September, Como sees average daytime highs of 22°C and overnight lows near 15°C, with 155 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 42% 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 Como's 5th-clearest and 10th-windiest month. For the whole year in context, see Como's year-round climate.

Daytime high
22°
4th warmest
Overnight low
15°
9th coldest
Rainfall
155 mm
10.4 wet days
Daylight
12 h 18 min
6:08 AM – 6:28 PM
Cloud cover
50%
5th clearest
Wind
6 km/h
10th windiest
Solar energy
3.8 kWh/m²
Travel score
6.6
out of 10
Air quality
Elevated
PM2.5 19.8 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 Como reaches about 22°C in the afternoon and slips back to 15°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 5°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12517
22417
32417
42416
52416
62416
72316
82316
92316
102315
112315
122315
132215
142215
152215
162215
172215
182114
192114
202114
212114
222114
232114
242014
252014
262013
272013
282013
291913
301913

How September really feels in Como

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.

Como 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 / 646.63.18.90.9
Feb / 646.92.610.11.8
Mar13° / 838.41.311.63.9
Apr17° / 12212.10.413.35.0
May21° / 13°13713.5014.76.0
Jun25° / 17°14312.9015.56.4
Jul27° / 19°11211.3015.26.5
Aug27° / 19°14612.4013.96.5
Sep22° / 15°15510.4012.36.6
Oct16° / 11°16110.7010.75.1
Nov11° / 17210.60.89.32.7
Dec / 787.32.68.51.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% 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 41%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16436
26535
36535
46535
56535
66535
76535
86535
96436
106337
116238
126238
136238
146139
156040
165941
175842
185842
195644
205644
215545
225545
235446
245446
255347
265248
275149
285149
295050
305050

Chance of precipitation in September

Any precipitation

Como gets around 155 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 36% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
137
237
336
436
536
636
736
836
936
1036
1136
1236
1336
1436
1536
1636
1736
1836
1936
2035
2135
2235
2335
2434
2535
2635
2735
2835
2936
3036

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 47% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13226366
23327346
33527335
43628315
53728304
63929294
73930283
84030273
94130263
104230262
114231252
124331242
134431232
144531231
154631221
164732211
174732201
184833181
194933171
205133160
215234140
225334130
235335120
245535100
25563590
26573580
27583570
28593560
29613450
30623440

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 5:49 AM to 6:27 AM, and sunset from 6:57 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:496:57
213.15:516:56
313.05:526:54
413.05:536:52
512.95:546:50
612.95:566:48
712.85:576:46
812.85:586:44
912.75:596:42
1012.66:016:40
1112.66:026:38
1212.56:036:36
1312.56:056:34
1412.46:066:32
1512.46:076:30
1612.36:086:28
1712.36:106:25
1812.26:116:23
1912.26:126:21
2012.16:146:19
2112.06:156:17
2212.06:166:15
2311.96:176:13
2411.96:196:11
2511.86:206:09
2611.86:216:07
2711.76:236:05
2811.76:246:03
2911.66:256:01
3011.56:275:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.8 kWh/m².

For context, solar energy here swings from a low near 1.23 kWh/m² to a high of 6.16 kWh/m² in July across the year — September's 3.8 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.2Bright
94.2Bright
104.1Bright
114.0Bright
124.0Moderate
133.9Moderate
143.9Moderate
153.8Moderate
163.8Moderate
173.7Moderate
183.6Moderate
193.6Moderate
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 Como?

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

6.6
Sightseeing
1st-best month of the year
4.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Como for sightseeing.

What to pack for Como in September

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

In September, Como sees daytime highs around 22°C and nights near 15°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Como 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 Como peaks around July 16 at about 8 (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 highHighModerateLowJul 16UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr6High
May7Very high
Jun7Very high
Jul8Very high
Aug7Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Como 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 Como is worst in March — around 25 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Como's WHO annual average of 19.8 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2225 µg/m³Nov 1416 µg/m³
PM2.5 (µg/m³)Level
Jan21Moderate
Feb20Moderate
Mar25Moderate
Apr24Moderate
May20Moderate
Jun23Moderate
Jul20Moderate
Aug18Moderate
Sep17Moderate
Oct17Moderate
Nov16Moderate
Dec17Moderate
Location & terrain

Where is Como?

Como sits at 45.8°N, 9.1°E, 201 m above sea level, in Italy. The nearest listed city is Cantù, 8.0 km away.

Topography around Como

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

Within 3 km, the terrain around Como has large variations in elevation — a maximum elevation change of 805 m around an average of 373 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,469 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,527 m.

The land around Como is covered by trees (62%) and artificial surfaces (25%) within 3 km, trees (62%) within 16 km, and trees (47%) and cropland (21%) within 80 km.

3 km
805 m
16 km
1,469 m
80 km
3,527 m
treesgrasslandcroplandartificial surfacesbare terrainsnow and icewatermoss and lichen
September weather nearby: Cantù 8.0 km · Erba 11 km · Mariano Comense 15 km · Giussano 15 km · Malnate 16 km · Meda 17 km · Tradate 18 km · Seveso 19 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 Como (45.8082°, 9.0832°, elevation 201 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).