Arese weather in September

In September, Arese sees average daytime highs of 23°C and overnight lows near 15°C, with 140 mm of rain across 10.1 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 44% 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 Arese's 3rd-clearest and 6th-windiest month. For the whole year in context, see Arese's year-round climate.

Daytime high
23°
4th warmest
Overnight low
15°
9th coldest
Rainfall
140 mm
10.1 wet days
Daylight
12 h 18 min
6:09 AM – 6:27 PM
Cloud cover
48%
3rd clearest
Wind
7 km/h
6th windiest
Solar energy
3.94 kWh/m²
Travel score
6.9
out of 10

Arese is chief town of the homonym municipality.

Air quality
Moderate
PM10 36.7 µg/m³ · 2010

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 Arese reaches about 23°C in the afternoon and slips back to 15°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°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)
12618
22617
32617
42617
52517
62517
72517
82516
92516
102516
112416
122416
132416
142416
152415
162315
172315
182315
192315
202315
212215
222214
232214
242214
252214
262114
272114
282114
292113
302113

How September really feels in Arese

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.

Arese 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 / 6471.88.91.1
Feb10° / 646.81.610.12.2
Mar14° / 818.30.611.64.6
Apr18° / 11511.50.113.25.6
May23° / 14°12812.3014.76.4
Jun27° / 18°12511.5015.46.3
Jul29° / 20°9710.2015.15.6
Aug28° / 19°13611.7013.95.8
Sep23° / 15°14010.1012.36.9
Oct18° / 11°14110.6010.75.5
Nov12° / 16310.80.49.33.0
Dec / 787.51.78.61.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% 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 40%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16634
26634
36634
46634
56634
66634
76535
86535
96535
106436
116436
126337
136337
146337
156238
166139
176139
186040
196040
205941
215941
225743
235644
245545
255545
265446
275347
285248
295149
304951

Chance of precipitation in September

Any precipitation

Arese gets around 140 mm of rain over 10.1 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 37% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
234
334
434
534
633
733
833
934
1034
1134
1234
1334
1434
1535
1635
1735
1835
1935
2035
2135
2235
2335
2434
2534
2635
2735
2835
2936
3037

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 39% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
127223517
228223416
329233314
430233313
531243212
632253211
733253111
834253110
93426319
103526318
113526318
123626317
133726317
143826316
153826305
163926305
174027294
184127284
194228273
204329262
214429252
224430242
234531221
244632211
254634201
264735180
274835170
284936150
295036140
305136130

Wind in September

Winds average 7 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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:50 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)
113.15:506:57
213.15:516:55
313.05:526:53
413.05:536:51
512.95:556:49
612.95:566:47
712.85:576:45
812.85:586:43
912.76:006:41
1012.66:016:40
1112.66:026:38
1212.56:036:36
1312.56:056:33
1412.46:066:31
1512.46:076:29
1612.36:096:27
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 3.94 kWh/m².

For context, solar energy here swings from a low near 1.21 kWh/m² to a high of 6.36 kWh/m² in July across the year — September's 3.94 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
124.1Bright
134.1Bright
144.0Bright
154.0Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.5Moderate
233.5Moderate
243.4Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.2Moderate
293.2Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Arese?

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
5.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Arese for sightseeing.

What to pack for Arese in September

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

In September, Arese sees daytime highs around 23°C and nights near 15°C. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

UV index in Arese 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 Arese 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 Arese 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 Arese is worst in March — around 21 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2221 µg/m³Nov 1414 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb17Moderate
Mar21Moderate
Apr20Moderate
May17Moderate
Jun20Moderate
Jul17Moderate
Aug15Moderate
Sep14Moderate
Oct14Moderate
Nov14Moderate
Dec15Moderate
Location & terrain

Where is Arese?

Arese sits at 45.6°N, 9.1°E, 160 m above sea level, in Italy. The nearest listed city is Garbagnate Milanese, 3.0 km away.

Topography around Arese

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

Within 3 km, the terrain around Arese has only modest variations in elevation — a maximum elevation change of 51 m around an average of 163 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 196 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,565 m.

The land around Arese is covered by artificial surfaces (41%) and trees (29%) within 3 km, artificial surfaces (45%) and trees (23%) within 16 km, and trees (39%) and cropland (35%) within 80 km.

3 km
51 m
16 km
196 m
80 km
2,565 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Garbagnate Milanese 3.0 km · Bollate 3.0 km · Rho 4.0 km · Lainate 5.0 km · Senago 5.0 km · Novate Milanese 5.0 km · Caronno Pertusella 6.0 km · Cormano 6.0 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 Arese (45.5505°, 9.0774°, elevation 160 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).