Alessandria weather in September

In September, Alessandria sees average daytime highs of 25°C and overnight lows near 15°C, with 86 mm of rain across 8.7 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 27°C in the first days to 22°C by the end. The sky is clear or mostly clear about 46% 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 36 min by month's end. Set against the rest of the year, September is Alessandria's 3rd-clearest and 6th-windiest month. For the whole year in context, see Alessandria's year-round climate.

Daytime high
25°
4th warmest
Overnight low
15°
9th coldest
Rainfall
86 mm
8.7 wet days
Daylight
12 h 18 min
6:11 AM – 6:29 PM
Cloud cover
47%
3rd clearest
Wind
6 km/h
6th windiest
Solar energy
3.98 kWh/m²
Travel score
7.1
out of 10

Alessandria is chief town of the homonym commune.

Air quality
Elevated
PM2.5 19.9 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 27°C in the first days to 22°C by the end.

A typical September day in Alessandria reaches about 25°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 29°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)
12818
22717
32717
42717
52717
62717
72617
82616
92616
102616
112616
122516
132516
142516
152515
162515
172415
182415
192415
202415
212415
222314
232314
242314
252314
262314
272214
282214
292213
302213

How September really feels in Alessandria

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.

Alessandria 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 / 576.6391.1
Feb10° / 556.2210.12.4
Mar15° / 617.10.711.64.8
Apr18° / 799.90.113.26.0
May23° / 13°8311014.66.6
Jun27° / 17°689.7015.36.4
Jul30° / 20°528.7015.15.2
Aug30° / 19°669.7013.95.5
Sep25° / 15°868.7012.37.1
Oct18° / 11°1009.4010.75.9
Nov12° / 1189.80.49.43.1
Dec / 667.42.48.71.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16832
26832
36832
46832
56733
66733
76733
86535
96535
106535
116436
126337
136337
146238
156238
166139
176139
186040
195941
205842
215842
225842
235743
245743
255644
265446
275446
285347
295248
305149

Chance of precipitation in September

Any precipitation

Alessandria gets around 86 mm of rain over 8.7 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 30% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
429
529
629
729
829
929
1029
1129
1229
1329
1430
1530
1630
1730
1830
1930
2030
2130
2230
2330
2430
2530
2630
2730
2830
2930
3030

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. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
125243516
227253414
328253413
429263411
530273310
63127339
73227338
83328337
93428326
103428325
113528325
123628324
133728314
143729313
153829303
163929293
174029283
184130263
194230253
204331243
214431232
224432222
234532202
244633192
254633182
264734182
274834171
284835161
294935151
305035141

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 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
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 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over September. Sunrise moves from 5:52 AM to 6:28 AM, and sunset from 6:58 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:526:58
213.05:536:56
313.05:556:54
412.95:566:53
512.95:576:51
612.85:586:49
712.86:006:47
812.76:016:45
912.76:026:43
1012.66:036:41
1112.66:046:39
1212.56:066:37
1312.56:076:35
1412.46:086:33
1512.46:096:31
1612.36:116:29
1712.36:126:27
1812.26:136:25
1912.16:146:23
2012.16:166:21
2112.06:176:19
2212.06:186:17
2311.96:196:15
2411.96:216:13
2511.86:226:11
2611.86:236:09
2711.76:246:07
2811.76:266:05
2911.66:276:04
3011.66:286:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.98 kWh/m².

For context, solar energy here swings from a low near 1.23 kWh/m² to a high of 6.42 kWh/m² in July across the year — September's 3.98 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.3Bright
114.2Bright
124.2Bright
134.1Bright
144.1Bright
154.0Bright
164.0Moderate
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 Alessandria?

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

7.1
Sightseeing
1st-best month of the year
6.2
Beach & pool
4th-best month of the year

September is one of the better times to visit Alessandria for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Alessandria in September

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

In September, Alessandria sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Alessandria 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 59 km away) is warmest in August at about 25°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 3 to Oct 19 — about 4.6 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr15Bracing
May18Cool
Jun22Refreshing
Jul24Warm
Aug25Warm
Sep23Refreshing
Oct20Refreshing
Nov18Cool
Dec16Cool

UV index in Alessandria 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 Alessandria peaks around July 14 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 14UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr7High
May6High
Jun8Very high
Jul9Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

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

Seasonal pattern from CAMS reanalysis, scaled to Alessandria's WHO annual average of 19.9 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1724 µg/m³Aug 1317 µg/m³
PM2.5 (µg/m³)Level
Jan25Moderate
Feb22Moderate
Mar25Moderate
Apr22Moderate
May19Moderate
Jun20Moderate
Jul17Moderate
Aug17Moderate
Sep17Moderate
Oct19Moderate
Nov18Moderate
Dec20Moderate
Location & terrain

Where is Alessandria?

Alessandria sits at 44.9°N, 8.6°E, 95 m above sea level, in Italy. The nearest listed city is Valenza, 12 km away.

Topography around Alessandria

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

Within 3 km, the terrain around Alessandria has only modest variations in elevation — a maximum elevation change of 25 m around an average of 93 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 219 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,764 m.

The land around Alessandria is covered by cropland (39%) and artificial surfaces (34%) within 3 km, cropland (69%) within 16 km, and trees (41%) and cropland (36%) within 80 km.

3 km
25 m
16 km
219 m
80 km
1,764 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Valenza 12 km · Tortona 20 km · Novi Ligure 21 km · Casale Monferrato 28 km · Acqui Terme 28 km · Asti 32 km · Voghera 33 km · Vercelli 48 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 Alessandria (44.9092°, 8.6101°, elevation 95 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).