Acqui Terme weather in September

In September, Acqui Terme sees average daytime highs of 24°C and overnight lows near 15°C, with 87 mm of rain across 7.8 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 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 36 min by month's end. Set against the rest of the year, September is Acqui Terme's 3rd-clearest and 7th-windiest month. For the whole year in context, see Acqui Terme's year-round climate.

Daytime high
24°
4th warmest
Overnight low
15°
9th coldest
Rainfall
87 mm
7.8 wet days
Daylight
12 h 18 min
6:11 AM – 6:30 PM
Cloud cover
46%
3rd clearest
Wind
7 km/h
7th windiest
Solar energy
4 kWh/m²
Travel score
7.3
out of 10

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 Acqui Terme 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)
12717
22717
32717
42616
52616
62616
72616
82616
92516
102516
112515
122515
132515
142415
152415
162415
172415
182414
192314
202314
212314
222314
232314
242214
252213
262213
272213
282213
292113
302113

How September really feels in Acqui Terme

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.

Acqui Terme 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 / 616.94.191.0
Feb / 5863.210.12.2
Mar14° / 6471.611.64.5
Apr17° / 779.20.413.25.7
May22° / 13°719.7014.66.7
Jun26° / 17°537.6015.37.1
Jul29° / 19°396.10156.0
Aug29° / 19°507.6013.96.1
Sep24° / 15°877.8012.37.3
Oct18° / 10°1008.90.210.75.8
Nov12° / 1211019.43.0
Dec / 697.73.68.71.2

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 38%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17030
27030
36931
46931
56832
66832
76832
86733
96733
106535
116535
126535
136436
146436
156337
166337
176238
186139
196238
206139
216040
225941
235941
245842
255743
265644
275545
285446
295347
305248

Chance of precipitation in September

Any precipitation

Acqui Terme gets around 87 mm of rain over 7.8 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
124
224
324
424
524
624
724
824
925
1025
1126
1227
1327
1428
1528
1628
1729
1829
1929
2029
2129
2229
2328
2428
2528
2628
2728
2828
2928
3028

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 42% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
127273511
228283410
32929339
43130328
53230317
63331306
73332305
83432295
93532294
103632284
113632284
123732273
133832273
143931263
154131263
164231252
174330242
184530232
194630222
204730212
214830202
224930192
235130181
245230171
255131171
265231161
275331151
285431141
295432131
305432131

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
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 5:53 AM to 6:29 AM, and sunset from 6:59 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:536:59
213.05:546:57
313.05:566:55
412.95:576:53
512.95:586:51
612.85:596:49
712.86:006:47
812.76:026:45
912.76:036:43
1012.66:046:41
1112.66:056:39
1212.56:066:37
1312.56:086:35
1412.46:096:34
1512.46:106:32
1612.36:116:30
1712.36:126:28
1812.26:146:26
1912.16:156:24
2012.16:166:22
2112.06:176:20
2212.06:196:18
2311.96:206:16
2411.96:216:14
2511.86:226:12
2611.86:246:10
2711.76:256:08
2811.76:266:06
2911.66:276:04
3011.66:296:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4 kWh/m².

For context, solar energy here swings from a low near 1.24 kWh/m² to a high of 6.44 kWh/m² in July across the year — September's 4 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
114.3Bright
124.2Bright
134.1Bright
144.1Bright
154.0Bright
164.0Moderate
173.9Moderate
183.8Moderate
193.8Moderate
203.7Moderate
213.7Moderate
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 Acqui Terme?

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

7.3
Sightseeing
1st-best month of the year
6.0
Beach & pool
4th-best month of the year

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

What to pack for Acqui Terme in September

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

In September, Acqui Terme sees daytime highs around 24°C and nights near 15°C. Worth packing: light clothes. About 8 days see rain.

light clothes

Sea temperature near Acqui Terme 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 36 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 Acqui Terme 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 Acqui Terme 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
Jul8Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low

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

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

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 Acqui Terme?

Acqui Terme sits at 44.7°N, 8.5°E, 156 m above sea level, in Italy. The nearest listed city is Novi Ligure, 27 km away.

Topography around Acqui Terme

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

Within 3 km, the terrain around Acqui Terme has significant variations in elevation — a maximum elevation change of 302 m around an average of 215 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 722 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,590 m.

The land around Acqui Terme is covered by trees (50%) and grassland (23%) within 3 km, trees (56%) and grassland (24%) within 16 km, and trees (43%) and cropland (29%) within 80 km.

3 km
302 m
16 km
722 m
80 km
2,590 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Novi Ligure 27 km · Alessandria 28 km · Asti 33 km · Alba 34 km · Tortona 40 km · Valenza 40 km · Savona 41 km · Genoa 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 Acqui Terme (44.6755°, 8.4693°, elevation 156 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).