Naples weather in September

In September, Naples sees average daytime highs of 24°C and overnight lows near 21°C, with 86 mm of rain across 8 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 22°C by the end. The sky is clear or mostly clear about 61% of the time in September, and the air most often feels muggy.

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 Naples's 4th-clearest and 8th-windiest month. For the whole year in context, see Naples's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
86 mm
8 wet days
Daylight
12 h 18 min
5:49 AM – 6:05 PM
Cloud cover
37%
4th clearest
Wind
12 km/h
8th windiest
Solar energy
4.68 kWh/m²
Travel score
7.6
out of 10
Air quality
Good
PM2.5 7.9 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 25°C in the first days to 22°C by the end.

A typical September day in Naples reaches about 24°C in the afternoon and slips back to 21°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 26°C. Set against its neighbours, September runs about 3°C cooler than August and about 3°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12523
22523
32522
42522
52522
62522
72522
82422
92422
102422
112421
122421
132421
142421
152421
162421
172421
182321
192321
202320
212320
222320
232320
242320
252320
262320
272220
282220
292220
302219

Naples weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan12° / 10°12211.59.43.3
Feb12° / 10°10110.610.43.3
Mar14° / 11°959.811.74.1
Apr16° / 13°749.313.15.1
May19° / 17°44614.27.0
Jun23° / 20°223.414.98.5
Jul26° / 23°11214.68.9
Aug26° / 24°182.613.68.6
Sep24° / 21°86812.37.6
Oct21° / 18°12410.210.96.6
Nov17° / 14°18813.59.75.1
Dec14° / 11°15413.49.13.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 61% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 24%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28317
38317
48218
58020
68020
77921
87822
97723
107723
117723
127624
137624
147624
157525
167426
177426
187426
197426
207426
217327
227327
237327
247228
257228
267228
277129
287030
297030
307030

Chance of precipitation in September

Any precipitation

Naples gets around 86 mm of rain over 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 30% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
119
220
321
421
522
623
724
824
925
1025
1126
1226
1327
1427
1528
1628
1729
1829
1929
2029
2129
2229
2329
2429
2529
2629
2729
2830
2930
3030

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 32% of days. Sticky, muggy-or-worse air turns up on roughly 39% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
159253526
259273523
3610283620
4611293618
5611303716
6712303714
7712313812
8713313910
971332399
1071432398
1181432397
1281532396
1381532395
1481632385
1591732375
1691832364
1792032354
18102132344
19102232323
20112332313
21112532293
22122632283
23122732272
24132832252
25132833242
26132934222
27142934211
28143035201
29143036191
30153137171

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

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 5:34 AM to 6:04 AM, and sunset from 6:31 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:346:31
212.95:356:30
312.95:366:28
412.85:376:26
512.85:386:24
612.75:396:23
712.75:406:21
812.65:416:19
912.65:426:18
1012.55:436:16
1112.55:446:14
1212.55:456:12
1312.45:466:11
1412.45:476:09
1512.35:486:07
1612.35:496:05
1712.25:506:04
1812.25:516:02
1912.15:526:00
2012.15:535:58
2112.05:545:56
2212.05:555:55
2311.95:565:53
2411.95:575:51
2511.85:585:49
2611.86:005:48
2711.86:015:46
2811.76:025:44
2911.76:035:42
3011.66:045:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.68 kWh/m².

For context, solar energy here swings from a low near 1.72 kWh/m² to a high of 7.07 kWh/m² in July across the year — September's 4.68 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.4Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.1Bright
85.1Bright
95.0Bright
105.0Bright
114.9Bright
124.8Bright
134.8Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.3Bright
234.3Bright
244.3Bright
254.2Bright
264.2Bright
274.1Bright
284.1Bright
294.0Bright
304.0Moderate
Planning a trip in September

Hazard calendar for Naples

In seasonPeak

In September, Naples sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Naples's rainy season runs September–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Naples?

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

7.6
Sightseeing
4th-best month of the year
6.2
Beach & pool
4th-best month of the year

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

What to pack for Naples in September

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

In September, Naples sees daytime highs around 24°C and nights near 21°C. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Naples 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 offshore is warmest in August at about 26°C and coldest in February near 14°C.

It's comfortable for a long swim from May 26 to Nov 7 — 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
Jun23Refreshing
Jul25Warm
Aug26Warm
Sep24Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Naples 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 Naples peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. 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 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highHighModerateLowJul 16UV 9Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr4Moderate
May7High
Jun9Very high
Jul10Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Naples?

Naples sits at 40.9°N, 14.3°E, 17 m above sea level, in Italy. The nearest listed city is San Lorenzo, 1.0 km away.

Topography around Naples

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

Within 3 km, the terrain around Naples has only modest variations in elevation — a maximum elevation change of 244 m around an average of 49 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,279 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,032 m.

The land around Naples is covered by artificial surfaces (63%) within 3 km, water (31%), artificial surfaces (30%) and trees (22%) within 16 km, and water (44%) and trees (35%) within 80 km.

3 km
244 m
16 km
1,279 m
80 km
2,032 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: San Lorenzo 1.0 km · Pendino 1.0 km · Vicaria 1.0 km · San Carlo All'Arena 1.0 km · Stella 2.0 km · Montecalvario 2.0 km · Avvocata 2.0 km · Poggioreale 2.0 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 Naples (40.8522°, 14.2681°, elevation 17 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).