Lorient weather in September

In September, Lorient sees average daytime highs of 19°C and overnight lows near 14°C, with 56 mm of rain across 7.7 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 17°C by the end. The sky is clear or mostly clear about 29% 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 Lorient's 3rd-clearest and 9th-windiest month. For the whole year in context, see Lorient's year-round climate.

Daytime high
19°
3rd warmest
Overnight low
14°
10th coldest
Rainfall
56 mm
7.7 wet days
Daylight
12 h 18 min
6:58 AM – 7:18 PM
Cloud cover
57%
3rd clearest
Wind
18 km/h
9th windiest
Solar energy
3.85 kWh/m²
Travel score
6.3
out of 10
Air quality
Good
PM2.5 9.2 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 20°C in the first days to 17°C by the end.

A typical September day in Lorient reaches about 19°C in the afternoon and slips back to 14°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 21°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)
12015
22015
32015
41915
51914
61914
71914
81914
91914
101914
111914
121914
131914
141914
151914
161914
171814
181814
191814
201813
211813
221813
231813
241813
251813
261813
271813
281713
291713
301713

Lorient weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan / 96138.71.8
Feb / 71119.91.8
Mar11° / 5710.711.62.6
Apr13° / 6010.513.43.5
May16° / 11°5410.114.94.8
Jun18° / 13°43815.76.1
Jul20° / 15°397.815.46.7
Aug20° / 15°468.114.16.7
Sep19° / 14°567.712.46.3
Oct16° / 12°9812.710.64.5
Nov12° / 9713.69.13.0
Dec10° / 10613.38.32.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55347
65347
75248
85248
95248
105149
115149
125050
134951
145050
155050
164951
175050
184951
194951
204951
214951
224753
234753
244753
254555
264555
274357
284258
294159
303961

Chance of precipitation in September

Any precipitation

Lorient gets around 56 mm of rain over 7.7 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 26% and peaks near 37% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
122
221
321
421
521
621
721
822
922
1022
1123
1223
1323
1424
1524
1625
1725
1826
1927
2027
2128
2229
2330
2432
2533
2634
2735
2836
2937
3037

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 54% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14143151
24342151
34441141
44540141
54739141
64838140
74937140
85136130
95235130
105235130
115334130
125433130
135532130
145632120
155632120
165831110
175831110
185931100
195832100
205832100
21593290
22583390
23583390
24593380
25593380
26593380
27603370
28603370
29603370
30623260

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2819light breeze
2919light breeze
3019light 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 6:37 AM to 7:17 AM, and sunset from 7:50 PM to 6:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:377:50
213.26:387:48
313.16:397:46
413.06:417:43
513.06:427:41
612.96:447:39
712.96:457:37
812.86:467:35
912.86:487:33
1012.76:497:31
1112.66:517:29
1212.66:527:27
1312.56:537:24
1412.56:557:22
1512.46:567:20
1612.36:587:18
1712.36:597:16
1812.27:007:14
1912.27:027:12
2012.17:037:09
2112.07:057:07
2212.07:067:05
2311.97:077:03
2411.97:097:01
2511.87:106:59
2611.77:126:57
2711.77:136:54
2811.67:156:52
2911.67:166:50
3011.57:176:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.85 kWh/m².

For context, solar energy here swings from a low near 0.95 kWh/m² to a high of 6.1 kWh/m² in June across the year — September's 3.85 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.0Bright
134.0Moderate
143.9Moderate
153.9Moderate
163.8Moderate
173.8Moderate
183.7Moderate
193.6Moderate
203.6Moderate
213.5Moderate
223.5Moderate
233.4Moderate
243.4Moderate
253.3Moderate
263.2Moderate
273.2Moderate
283.1Moderate
293.0Moderate
303.0Moderate
Planning a trip in September

Is September a good time to visit Lorient?

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

6.3
Sightseeing
3rd-best month of the year
2.4
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Lorient for sightseeing.

What to pack for Lorient in September

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

In September, Lorient sees daytime highs around 19°C and nights near 14°C. Little to plan around — just the basics. About 8 days see rain.

Sea temperature near Lorient in September

The nearest coast averages about 17°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 14 km away) is warmest in August at about 18°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
May14Bracing
Jun16Cool
Jul18Cool
Aug18Cool
Sep17Cool
Oct16Cool
Nov14Bracing
Dec12Bracing

UV index in Lorient 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 Lorient peaks around August 10 at about 7 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 10UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr5High
May6High
Jun7High
Jul7High
Aug7High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Lorient?

Lorient sits at 47.7°N, 3.4°W, 10 m above sea level, in France. The nearest listed city is Lanester, 3.0 km away.

Topography around Lorient

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

Within 3 km, the terrain around Lorient has only modest variations in elevation — a maximum elevation change of 57 m around an average of 15 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 137 m; within 80 km, significant variations in elevation — a maximum elevation change of 373 m.

The land around Lorient is covered by artificial surfaces (41%) and trees (27%) within 3 km, water (33%) and trees (30%) within 16 km, and water (37%), trees (25%) and cropland (21%) within 80 km.

3 km
57 m
16 km
137 m
80 km
373 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Lanester 3.0 km · Ploemeur 5.0 km · Concarneau 43 km · Pontivy 47 km · Vannes 47 km · Quimper 61 km · Douarnenez 81 km · Guérande 85 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 Lorient (47.7482°, -3.3718°, elevation 10 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).