Ajaccio weather in September

In September, Ajaccio sees average daytime highs of 21°C and overnight lows near 18°C, with 52 mm of rain across 7.1 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 20°C by the end. The sky is clear or mostly clear about 58% 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 Ajaccio's 4th-clearest and 8th-windiest month. For the whole year in context, see Ajaccio's year-round climate.

Daytime high
21°
3rd warmest
Overnight low
18°
10th coldest
Rainfall
52 mm
7.1 wet days
Daylight
12 h 18 min
6:11 AM – 6:28 PM
Cloud cover
38%
4th clearest
Wind
9 km/h
8th windiest
Solar energy
4.7 kWh/m²
Travel score
7.3
out of 10

Ajaccio is French commune and prefecture of Corse-du-Sud and Corsica.

Air quality
Good
PM2.5 9.3 µg/m³ · 2019
Density
663/km²
people per km²

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 23°C in the first days to 20°C by the end.

A typical September day in Ajaccio reaches about 21°C in the afternoon and slips back to 18°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 24°C. Set against its neighbours, September runs about 3°C cooler than August and about 3°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12320
22319
32319
42319
52219
62219
72219
82219
92219
102218
112218
122218
132218
142118
152118
162118
172118
182117
192117
202117
212117
222117
232017
242017
252017
262017
272017
282016
292016
302016

Ajaccio weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 8711.41.19.32.3
Feb10° / 7510.41.410.32.3
Mar12° / 7510.40.911.73.2
Apr14° / 10°7410.30.213.14.1
May17° / 14°567.4014.36.1
Jun21° / 18°315.50157.7
Jul24° / 20°133014.78.9
Aug24° / 21°143.1013.78.8
Sep21° / 18°527.1012.37.3
Oct18° / 15°10310.4010.96.0
Nov14° / 11°13613.30.19.63.9
Dec11° / 12213.60.992.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 58% 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 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28614
38614
48515
58515
68317
78317
88119
98020
107921
117822
127723
137525
147525
157327
167327
177129
187129
197030
206931
216931
226931
236832
246832
256832
266832
276832
286832
296832
306832

Chance of precipitation in September

Any precipitation

Ajaccio gets around 52 mm of rain over 7.1 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 24% 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 (%)
115
215
316
416
517
618
719
819
920
1021
1122
1223
1324
1424
1525
1626
1727
1828
1928
2028
2128
2229
2329
2429
2529
2629
2729
2829
2930
3030

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 38% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
112314513
212314511
313324510
41433449
51533448
61634447
71634436
81735436
91835425
101835425
111936414
121936414
132036404
142136394
152237374
162337364
172437354
182538334
192639323
202739303
212840283
222942273
233043252
243144242
253244222
263345212
273445201
283545191
293646181
303745170

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 5:55 AM to 6:26 AM, and sunset from 6:54 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:556:54
212.95:566:53
312.95:576:51
412.95:586:49
512.85:596:47
612.86:006:46
712.76:016:44
812.76:026:42
912.66:046:40
1012.66:056:39
1112.56:066:37
1212.56:076:35
1312.46:086:33
1412.46:096:31
1512.36:106:30
1612.36:116:28
1712.26:126:26
1812.26:136:24
1912.16:146:22
2012.16:156:20
2112.06:166:19
2212.06:186:17
2311.96:196:15
2411.96:206:13
2511.86:216:11
2611.86:226:10
2711.76:236:08
2811.76:246:06
2911.76:256:04
3011.66:266:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.7 kWh/m².

For context, solar energy here swings from a low near 1.63 kWh/m² to a high of 7.29 kWh/m² in July across the year — September's 4.7 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.5Bright
35.5Bright
45.4Bright
55.3Bright
65.3Bright
75.2Bright
85.2Bright
95.1Bright
105.0Bright
115.0Bright
124.9Bright
134.8Bright
144.8Bright
154.7Bright
164.7Bright
174.6Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.0Bright
294.0Bright
304.0Moderate
Planning a trip in September

Hazard calendar for Ajaccio

In seasonPeak

None of Ajaccio's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Ajaccio's rainy season runs October–April, 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 Ajaccio?

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

7.3
Sightseeing
4th-best month of the year
4.7
Beach & pool
4th-best month of the year

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

What to pack for Ajaccio in September

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

In September, Ajaccio sees daytime highs around 21°C and nights near 18°C. Worth packing: sun protection. About 7 days see rain.

sun protection

Sea temperature near Ajaccio 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 offshore is warmest in August at about 25°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Oct 24 — 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
Jun21Refreshing
Jul24Refreshing
Aug25Warm
Sep23Refreshing
Oct21Refreshing
Nov18Cool
Dec15Cool

UV index in Ajaccio 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 Ajaccio peaks around July 13 at about 9 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 13UV 9Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr5Moderate
May7High
Jun9Very high
Jul10Very high
Aug7Very high
Sep5High
Oct4Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Ajaccio?

Ajaccio sits at 41.9°N, 8.7°E, 0 m above sea level, in France. The nearest listed city is Bastia, 105 km away.

Topography around Ajaccio

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

Within 3 km, the terrain around Ajaccio has significant variations in elevation — a maximum elevation change of 419 m around an average of 43 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,125 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,620 m.

The land around Ajaccio is covered by water (51%) within 3 km, water (42%), shrubs (26%) and trees (20%) within 16 km, and water (53%) and trees (24%) within 80 km.

3 km
419 m
16 km
1,125 m
80 km
2,620 m
treesshrubsgrasslandartificial surfacesbare terrainwater
September weather nearby: Bastia 105 km · Porto Torres 124 km · Olbia 128 km · Monte Rosello 132 km · Sassari 134 km · Alghero 155 km · Nuoro 184 km · Piombino 185 km

France travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 77% of US
price level, 2025
GDP per capita
$48,986
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.3
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 539
Religion
Roman Catholic 47%none 33%Muslim 4%Protestant 2%

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 Ajaccio (41.9189°, 8.7381°, elevation 0 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).