Les Sables-d'Olonne weather in September

In September, Les Sables-d'Olonne sees average daytime highs of 20°C and overnight lows near 15°C, with 56 mm of rain across 8.2 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 18°C by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Les Sables-d'Olonne's 3rd-clearest and 9th-windiest month. For the whole year in context, see Les Sables-d'Olonne's year-round climate.

Daytime high
20°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
56 mm
8.2 wet days
Daylight
12 h 18 min
6:52 AM – 7:11 PM
Cloud cover
51%
3rd clearest
Wind
17 km/h
9th windiest
Solar energy
4.15 kWh/m²
Travel score
6.6
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 21°C in the first days to 18°C by the end.

A typical September day in Les Sables-d'Olonne reaches about 20°C in the afternoon and slips back to 15°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 23°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12116
22116
32116
42116
52116
62116
72116
82116
92016
102016
112016
122015
132015
142015
152015
162015
172015
182015
191915
201915
211915
221915
231915
241915
251915
261915
271914
281914
291814
301814

Les Sables-d'Olonne 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
Jan10° / 9113.48.81.8
Feb10° / 6410.5102.0
Mar12° / 5710.711.62.9
Apr14° / 529.913.33.9
May17° / 12°549.914.85.3
Jun20° / 15°397.815.56.5
Jul21° / 17°336.615.27.3
Aug22° / 17°406.8147.3
Sep20° / 15°568.212.46.6
Oct17° / 13°9312.710.74.9
Nov13° / 10°10613.99.23.2
Dec10° / 10014.18.42.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 45%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36139
46139
56040
66040
75941
85941
95842
105842
115743
125743
135644
145644
155545
165545
175545
185545
195545
205446
215446
225446
235248
245248
255149
265050
274951
284951
294852
304753

Chance of precipitation in September

Any precipitation

Les Sables-d'Olonne gets around 56 mm of rain over 8.2 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 28% and peaks near 36% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
120
220
321
421
522
622
723
824
924
1025
1126
1227
1327
1428
1528
1629
1729
1830
1930
2031
2131
2231
2332
2432
2533
2634
2734
2835
2935
3036

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 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13041254
23141244
33341243
43440233
53540232
63639232
73739232
83838221
93937221
104037221
114136211
124236211
134336211
144435201
154535191
164635191
174735180
184735170
194835170
204836160
214836160
224836150
234837150
244837150
254837140
264938140
274938130
285038130
295137120
305137120

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over September. Sunrise moves from 6:32 AM to 7:10 AM, and sunset from 7:42 PM to 6:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:327:42
213.16:337:40
313.16:357:38
413.06:367:36
512.96:377:34
612.96:397:32
712.86:407:30
812.86:417:28
912.76:427:26
1012.76:447:24
1112.66:457:22
1212.66:467:19
1312.56:487:17
1412.46:497:15
1512.46:507:13
1612.36:527:11
1712.36:537:09
1812.26:547:07
1912.26:567:05
2012.16:577:03
2112.06:587:01
2212.07:006:59
2311.97:016:57
2411.97:026:55
2511.87:046:53
2611.87:056:51
2711.77:066:49
2811.67:086:47
2911.67:096:44
3011.57:106:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 1.07 kWh/m² to a high of 6.33 kWh/m² in June across the year — September's 4.15 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.8Bright
54.7Bright
64.7Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.0Bright
194.0Moderate
203.9Moderate
213.8Moderate
223.8Moderate
233.7Moderate
243.6Moderate
253.6Moderate
263.5Moderate
273.4Moderate
283.4Moderate
293.3Moderate
303.2Moderate
Planning a trip in September

Is September a good time to visit Les Sables-d'Olonne?

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

6.6
Sightseeing
3rd-best month of the year
3.3
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Les Sables-d'Olonne for sightseeing.

What to pack for Les Sables-d'Olonne in September

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

In September, Les Sables-d'Olonne sees daytime highs around 20°C and nights near 15°C. Worth packing: rain gear. About 8 days see rain.

rain gear

Sea temperature near Les Sables-d'Olonne in September

The nearest coast averages about 19°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 15 km away) is warmest in August at about 20°C and coldest in February near 10°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan11Bracing
Feb10Bracing
Mar10Bracing
Apr12Bracing
May15Bracing
Jun17Cool
Jul19Cool
Aug20Cool
Sep19Cool
Oct17Cool
Nov15Bracing
Dec12Bracing

UV index in Les Sables-d'Olonne 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 Les Sables-d'Olonne peaks around July 20 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 20UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr6High
May6High
Jun7High
Jul7Very high
Aug7Very high
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Les Sables-d'Olonne?

Les Sables-d'Olonne sits at 46.5°N, 1.8°W, 7 m above sea level, in France. The nearest listed city is La Roche-sur-Yon, 33 km away.

Topography around Les Sables-d'Olonne

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Les Sables-d'Olonne.

Within 3 km, the terrain around Les Sables-d'Olonne has only modest variations in elevation — a maximum elevation change of 31 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 94 m; within 80 km, significant variations in elevation — a maximum elevation change of 339 m.

The land around Les Sables-d'Olonne is covered by artificial surfaces (40%) and water (39%) within 3 km, water (57%) within 16 km, and water (43%), cropland (25%) and grassland (20%) within 80 km.

3 km
31 m
16 km
94 m
80 km
339 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: La Roche-sur-Yon 33 km · Challans 39 km · La Rochelle 61 km · Les Herbiers 72 km · Fontenay-le-Comte 75 km · Bouguenais 77 km · Vertou 78 km · Rezé 79 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 Les Sables-d'Olonne (46.4969°, -1.7847°, elevation 7 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).