Avellino weather in September

In September, Avellino sees average daytime highs of 24°C and overnight lows near 15°C, with 86 mm of rain across 9.6 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 22°C by the end. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Avellino's 4th-clearest and 8th-windiest month. For the whole year in context, see Avellino's year-round climate.

Daytime high
24°
4th warmest
Overnight low
15°
9th coldest
Rainfall
86 mm
9.6 wet days
Daylight
12 h 18 min
5:47 AM – 6:03 PM
Cloud cover
45%
4th clearest
Wind
7 km/h
8th windiest
Solar energy
4.5 kWh/m²
Travel score
7.1
out of 10

Avellino is chief town of the homonym municipality.

Air quality
Moderate
PM2.5 14.6 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 22°C by the end.

A typical September day in Avellino 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 4°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12717
22617
32617
42617
52617
62616
72516
82516
92516
102516
112516
122516
132416
142415
152415
162415
172415
182415
192415
202315
212315
222314
232314
242314
252314
262214
272214
282214
292214
302213

Avellino weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 10210.70.89.42.1
Feb10° / 9611.21.110.42.3
Mar13° / 104110.511.73.7
Apr16° / 10112.50.213.14.9
May21° / 12°759.9014.36.6
Jun25° / 16°416.8014.97.6
Jul28° / 18°244.6014.67.4
Aug29° / 19°285013.66.9
Sep24° / 15°869.6012.37.1
Oct20° / 12°12810.3010.96.4
Nov15° / 15512.90.29.74.2
Dec11° / 12912.10.69.12.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 32%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27822
37723
47624
57426
67426
77228
87228
97030
107030
117030
126832
136832
146733
156733
166733
176634
186634
196535
206634
216535
226535
236535
246535
256436
266436
276436
286436
296337
306337

Chance of precipitation in September

Any precipitation

Avellino gets around 86 mm of rain over 9.6 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 32% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
228
329
430
531
631
732
832
933
1033
1133
1233
1333
1433
1533
1633
1733
1833
1933
2032
2132
2232
2331
2431
2531
2631
2731
2831
2931
3031

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the comfortable band about 34% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
121274012
223273911
324283810
42529379
52530378
62631367
72632356
82734345
92735345
102735334
112836334
122836323
132937313
143037313
153037303
163237293
173337283
183436273
193636263
203736252
213935242
224035232
234234222
244334212
254434212
264534201
274534191
284635181
294735171
304736161

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
16calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours 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 84 minutes over September. Sunrise moves from 5:32 AM to 6:02 AM, and sunset from 6:29 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:326:29
212.95:336:28
312.95:346:26
412.85:356:24
512.85:366:22
612.75:376:21
712.75:386:19
812.65:396:17
912.65:406:16
1012.55:416:14
1112.55:426:12
1212.55:436:10
1312.45:446:08
1412.45:456:07
1512.35:466:05
1612.35:476:03
1712.25:486:01
1812.25:496:00
1912.15:505:58
2012.15:515:56
2112.05:525:54
2212.05:535:53
2311.95:545:51
2411.95:555:49
2511.85:565:47
2611.85:575:46
2711.85:585:44
2811.76:005:42
2911.76:015:40
3011.66:025:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.5 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 6.94 kWh/m² in July across the year — September's 4.5 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.1Bright
55.1Bright
65.0Bright
75.0Bright
84.9Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.0Bright
264.0Moderate
274.0Moderate
283.9Moderate
293.9Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Avellino?

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

7.1
Sightseeing
3rd-best month of the year
6.0
Beach & pool
4th-best month of the year

September is one of the better times to visit Avellino for general sightseeing.

What to pack for Avellino in September

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

In September, Avellino sees daytime highs around 24°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Avellino in September

The nearest coast averages about 24°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 33 km away) is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from May 27 to Nov 8 — about 5.5 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar14Bracing
Apr16Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug26Warm
Sep24Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Avellino in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Avellino peaks around July 16 at about 10 (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 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateLowJul 16UV 10Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr4Moderate
May7High
Jun9Very high
Jul10Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec1Low

Air quality in Avellino 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 Avellino is worst in April — around 18 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Seasonal pattern from CAMS reanalysis, scaled to Avellino's WHO annual average of 14.6 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1218 µg/m³Sep 1813 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb16Moderate
Mar17Moderate
Apr18Moderate
May15Moderate
Jun14Moderate
Jul13Moderate
Aug14Moderate
Sep13Moderate
Oct13Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Avellino?

Avellino sits at 40.9°N, 14.8°E, 348 m above sea level, in Italy. The nearest listed city is Sarno, 19 km away.

Topography around Avellino

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

Within 3 km, the terrain around Avellino has significant variations in elevation — a maximum elevation change of 309 m around an average of 389 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,697 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,032 m.

The land around Avellino is covered by trees (74%) and artificial surfaces (24%) within 3 km, trees (87%) within 16 km, and trees (44%), cropland (23%) and water (22%) within 80 km.

3 km
309 m
16 km
1,697 m
80 km
2,032 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Sarno 19 km · Nocera Superiore 22 km · Nola 22 km · Nocera Inferiore 22 km · Benevento 24 km · Pagani 24 km · Poggiomarino 25 km · Cava Dè Tirreni 25 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 Avellino (40.9149°, 14.791°, elevation 348 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).