Cagliari weather in September

In September, Cagliari sees average daytime highs of 26°C and overnight lows near 19°C, with 31 mm of rain across 4.9 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 28°C in the first days to 25°C by the end. The sky is clear or mostly clear about 59% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Cagliari's 4th-clearest and 11th-windiest month. For the whole year in context, see Cagliari's year-round climate.

Daytime high
26°
4th warmest
Overnight low
19°
10th coldest
Rainfall
31 mm
4.9 wet days
Daylight
12 h 18 min
6:10 AM – 6:25 PM
Cloud cover
37%
4th clearest
Wind
11 km/h
11th windiest
Solar energy
5.1 kWh/m²
Travel score
7.7
out of 10
Air quality
Elevated
PM2.5 19.2 µg/m³ · 2019

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← AugustCagliari year-round climateOctober →Best places to visit in September
JanFebMarAprMayJunJulAugSepOctNovDec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 28°C in the first days to 25°C by the end.

A typical September day in Cagliari reaches about 26°C in the afternoon and slips back to 19°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 29°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)
12920
22820
32820
42820
52820
62819
72819
82719
92719
102719
112719
122719
132719
142719
152619
162618
172618
182618
192618
202618
212618
222618
232518
242518
252518
262517
272517
282517
292517
302517

Cagliari weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan13° / 7°376.79.64.1
Feb14° / 7°397.410.54.2
Mar16° / 9°467.511.75.4
Apr18° / 11°488.4136.3
May22° / 14°335.614.17.7
Jun27° / 18°102.114.78.2
Jul30° / 21°20.514.57.0
Aug30° / 21°81.813.56.5
Sep26° / 19°314.912.37.7
Oct23° / 15°436.1117.6
Nov18° / 12°629.19.85.9
Dec15° / 9°548.69.34.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 59% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 23%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18614
28515
38416
48218
58218
68119
78119
87921
97921
107822
117822
127723
137624
147624
157525
167525
177525
187426
197426
207426
217426
227426
237327
247327
257327
267228
277228
287228
297129
307129

Chance of precipitation in September

Any precipitation

Cagliari gets around 31 mm of rain over 4.9 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 16% and peaks near 19% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
19
210
310
411
512
613
713
814
914
1015
1115
1216
1316
1416
1517
1617
1717
1818
1918
2018
2118
2219
2319
2419
2519
2619
2719
2819
2919
3019

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 36% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
142536313
242636313
342636303
452636303
552736303
662736292
762736292
872636292
972636292
1082635292
1192635282
1292635282
13102635282
14102635272
15112635272
16112635262
17122635252
18132635242
19132735232
20142736212
21142736202
22152836192
23152936182
24152937172
25153036162
26163136152
27163236151
28173236141
29173335141
30183335131

Wind in September

Winds average 11 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 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 78 minutes over September. Sunrise moves from 5:56 AM to 6:24 AM, and sunset from 6:50 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:566:50
212.95:576:49
312.85:586:47
412.85:596:45
512.76:006:44
612.76:016:42
712.66:026:40
812.66:036:39
912.66:046:37
1012.56:056:35
1112.56:066:34
1212.46:076:32
1312.46:076:30
1412.36:086:29
1512.36:096:27
1612.36:106:25
1712.26:116:24
1812.26:126:22
1912.16:136:20
2012.16:146:19
2112.06:156:17
2212.06:166:15
2311.96:176:14
2411.96:186:12
2511.96:196:10
2611.86:206:09
2711.86:216:07
2811.76:226:05
2911.76:236:04
3011.66:246:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.1 kWh/m².

For context, solar energy here swings from a low near 2 kWh/m² to a high of 7.54 kWh/m² in July across the year — September's 5.1 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.8Bright
45.7Bright
55.7Bright
65.6Bright
75.6Bright
85.5Bright
95.4Bright
105.4Bright
115.3Bright
125.3Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.0Bright
185.0Bright
194.9Bright
204.9Bright
214.8Bright
224.8Bright
234.7Bright
244.7Bright
254.6Bright
264.6Bright
274.5Bright
284.5Bright
294.5Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Cagliari?

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

7.7
Sightseeing
2nd-best month of the year
7.6
Beach & pool
4th-best month of the year

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

What to pack for Cagliari in September

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

In September, Cagliari sees daytime highs around 26°C and nights near 19°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Cagliari 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 Jun 8 to Nov 2 — about 4.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul24Warm
Aug26Warm
Sep24Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Cagliari 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 Cagliari peaks around July 16 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 16UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb4Moderate
Mar5High
Apr6High
May7High
Jun7Very high
Jul10Very high
Aug7High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Cagliari 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 Cagliari is worst in March — around 23 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 13 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Cagliari's WHO annual average of 19.2 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2223 µg/m³Dec 1514 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb20Moderate
Mar23Moderate
Apr23Moderate
May22Moderate
Jun21Moderate
Jul19Moderate
Aug19Moderate
Sep19Moderate
Oct19Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Cagliari?

Cagliari sits at 39.2°N, 9.1°E, 6 m above sea level, in Italy. The nearest listed city is Monserrato, 4.0 km away.

Topography around Cagliari

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

Within 3 km, the terrain around Cagliari has only modest variations in elevation — a maximum elevation change of 117 m around an average of 19 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 667 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,454 m.

The land around Cagliari is covered by artificial surfaces (56%) and water (23%) within 3 km, water (39%) and grassland (26%) within 16 km, and water (46%) and trees (26%) within 80 km.

3 km
117 m
16 km
667 m
80 km
1,454 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
← AugustCagliari year-round climateOctober →Best places to visit in September
September weather nearby: Monserrato 4.0 km · Selargius 5.0 km · Sestu 8.0 km · Sinnai 11 km · Quartu Sant'Elena 11 km · Assemini 12 km · Iglesias 51 km · Carbonia 52 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 Cagliari (39.2305°, 9.1192°, elevation 6 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).