Asti weather in September

In September, Asti sees average daytime highs of 24°C and overnight lows near 15°C, with 111 mm of rain across 10 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 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 36 min by month's end. Set against the rest of the year, September is Asti's 3rd-clearest and 7th-windiest month. For the whole year in context, see Asti's year-round climate.

Daytime high
24°
4th warmest
Overnight low
15°
9th coldest
Rainfall
111 mm
10 wet days
Daylight
12 h 18 min
6:12 AM – 6:31 PM
Cloud cover
49%
3rd clearest
Wind
6 km/h
7th windiest
Solar energy
3.92 kWh/m²
Travel score
6.9
out of 10

Asti is location in Italy.

Air quality
Good
PM10 29.7 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 Asti 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 19°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
42616
52616
62516
72516
82516
92516
102516
112515
122415
132415
142415
152415
162415
172315
182314
192314
202314
212314
222214
232214
242214
252213
262213
272113
282113
292113
302113

How September really feels in Asti

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.

Asti 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 / -0°576.53.190.8
Feb / 586.12.310.12.1
Mar14° / 677.60.911.64.5
Apr18° / 9411.20.113.25.6
May22° / 13°11413.4014.66.2
Jun26° / 17°10612.1015.36.3
Jul29° / 19°8311.1015.15.6
Aug28° / 19°10812013.95.8
Sep24° / 15°11110012.36.9
Oct18° / 10°1079.3010.75.6
Nov11° / 1249.20.69.42.9
Dec / 6572.68.71.0

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 16% of September, with mostly cloudy or overcast conditions the remaining 42%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16634
26535
36535
46535
56436
66436
76436
86337
96238
106238
116139
126139
136139
146040
155941
165842
175743
185743
195644
205545
215644
225545
235446
245347
255248
265149
275149
284951
294951
304852

Chance of precipitation in September

Any precipitation

Asti gets around 111 mm of rain over 10 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 34% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
234
334
434
534
634
734
834
934
1034
1134
1234
1335
1435
1535
1635
1735
1835
1935
2035
2135
2234
2334
2434
2534
2633
2733
2833
2933
3033

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 38% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1232234201
2252334180
3262434160
4282533140
5292533130
6302633110
7312732100
832273290
932273280
1033283270
1134283270
1235283160
1335283160
1436283050
1537292950
1638292850
1739302740
1840302640
1941312540
2042312340
2143322230
2244332130
2345332030
2445341820
2546341720
2647351620
2748351510
2850351410
2951351310
3051351310

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 5:54 AM to 6:30 AM, and sunset from 7:00 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:547:00
213.05:556:58
313.05:566:56
412.95:586:54
512.95:596:52
612.86:006:50
712.86:016:48
812.76:026:46
912.76:046:45
1012.66:056:43
1112.66:066:41
1212.56:076:39
1312.56:096:37
1412.46:106:35
1512.46:116:33
1612.36:126:31
1712.36:136:29
1812.26:156:27
1912.16:166:25
2012.16:176:23
2112.06:186:21
2212.06:206:19
2311.96:216:17
2411.96:226:15
2511.86:236:13
2611.86:256:11
2711.76:266:09
2811.76:276:07
2911.66:286:05
3011.66:306:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.92 kWh/m².

For context, solar energy here swings from a low near 1.25 kWh/m² to a high of 6.34 kWh/m² in July across the year — September's 3.92 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
84.3Bright
94.3Bright
104.2Bright
114.2Bright
124.1Bright
134.1Bright
144.0Bright
153.9Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.6Moderate
213.6Moderate
223.5Moderate
233.5Moderate
243.4Moderate
253.4Moderate
263.3Moderate
273.2Moderate
283.2Moderate
293.1Moderate
303.1Moderate
Planning a trip in September

Is September a good time to visit Asti?

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 Asti for sightseeing.

What to pack for Asti in September

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

In September, Asti 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

Sea temperature near Asti 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 67 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 Asti 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 Asti 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 Asti 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 Asti 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 Asti?

Asti sits at 44.9°N, 8.2°E, 123 m above sea level, in Italy. The nearest listed city is Alba, 26 km away.

Topography around Asti

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

Within 3 km, the terrain around Asti has only modest variations in elevation — a maximum elevation change of 124 m around an average of 132 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 257 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,572 m.

The land around Asti is covered by artificial surfaces (32%), trees (28%) and cropland (21%) within 3 km, trees (48%), cropland (25%) and grassland (22%) within 16 km, and trees (44%) and cropland (35%) within 80 km.

3 km
124 m
16 km
257 m
80 km
2,572 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Alba 26 km · Alessandria 32 km · Casale Monferrato 32 km · Acqui Terme 33 km · Chieri 33 km · Bra 36 km · Valenza 36 km · Carmagnola 39 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 Asti (44.9016°, 8.2075°, elevation 123 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).