Strasbourg weather in September

In September, Strasbourg sees average daytime highs of 20°C and overnight lows near 11°C, with 70 mm of rain across 10.3 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 18°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 18 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Strasbourg's 3rd-clearest and 9th-windiest month. For the whole year in context, see Strasbourg's year-round climate.

Daytime high
20°
4th warmest
Overnight low
11°
9th coldest
Rainfall
70 mm
10.3 wet days
Daylight
12 h 24 min
6:13 AM – 6:34 PM
Cloud cover
59%
3rd clearest
Wind
7 km/h
9th windiest
Solar energy
3.48 kWh/m²
Travel score
6.2
out of 10

Strasbourg is capital and largest city of Grand Est, located in the historical region of Alsace.

Air quality
Moderate
PM2.5 14 µg/m³ · 2019
Density
3,512/km²
people per km²
Founded
~11 BCE

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 22°C in the first days to 18°C by the end.

A typical September day in Strasbourg reaches about 20°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 26°C. Set against its neighbours, September runs about 5°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12313
22313
32213
42213
52213
62212
72212
82212
92112
102112
112112
122112
132112
142111
152111
162011
172011
182011
192011
202011
212011
221911
231910
241910
251910
261910
271910
281810
291810
301810

How September really feels in Strasbourg

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Strasbourg 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 daysSnow daysDaylight (hours)Travel score
Jan / 7213.23.18.50.0
Feb / 6311.23.19.80.7
Mar11° / 7012.51.311.62.7
Apr16° / 6011.60.113.44.6
May20° / 10°8313.80155.6
Jun23° / 13°7912.5015.86.4
Jul25° / 15°8413.1015.56.4
Aug25° / 15°7612014.16.6
Sep20° / 11°7010.3012.46.2
Oct15° / 7711.90.110.64.3
Nov / 7611.9191.7
Dec / 8714.63.38.20.3

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 17% of September, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24852
34852
44852
54753
64753
74753
84753
94753
104753
114753
124753
134753
144753
154753
164753
174654
184555
194555
204555
214555
224456
234456
244456
254258
264258
274159
284060
293961
303763

Chance of precipitation in September

Any precipitation

Strasbourg gets around 70 mm of rain over 10.3 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 36% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
335
435
535
635
735
835
935
1035
1135
1235
1335
1435
1535
1635
1735
1835
1935
2035
2135
2236
2336
2437
2538
2639
2739
2840
2941
3042

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 72% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
1583012
2602911
3612910
4622810
563289
664288
766277
866277
967276
1068275
1169265
1269265
1370264
1471254
1573243
1673243
1774233
1876222
1976222
2077212
2177212
2279201
2380191
2480191
2581181
2681181
2781181
2881181
2982171
3083170

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 18 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 108 minutes over September. Sunrise moves from 5:51 AM to 6:33 AM, and sunset from 7:06 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:517:06
213.25:537:04
313.15:547:02
413.15:557:00
513.05:576:58
613.05:586:56
712.96:006:54
812.86:016:51
912.86:036:49
1012.76:046:47
1112.76:066:45
1212.66:076:43
1312.56:086:40
1412.56:106:38
1512.46:116:36
1612.46:136:34
1712.36:146:32
1812.26:166:29
1912.26:176:27
2012.16:196:25
2112.06:206:23
2212.06:226:21
2311.96:236:18
2411.96:256:16
2511.86:266:14
2611.76:276:12
2711.76:296:10
2811.66:306:08
2911.66:326:05
3011.56:336:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.48 kWh/m².

For context, solar energy here swings from a low near 0.82 kWh/m² to a high of 5.73 kWh/m² in June across the year — September's 3.48 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.0Bright
44.0Moderate
53.9Moderate
63.9Moderate
73.9Moderate
83.8Moderate
93.8Moderate
103.7Moderate
113.7Moderate
123.6Moderate
133.6Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.3Moderate
203.3Moderate
213.2Moderate
223.2Moderate
233.1Moderate
243.1Moderate
253.0Moderate
263.0Moderate
272.9Moderate
282.9Moderate
292.8Moderate
302.7Moderate
Planning a trip in September

Is September a good time to visit Strasbourg?

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

6.2
Sightseeing
4th-best month of the year
3.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Strasbourg for sightseeing.

What to pack for Strasbourg in September

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

In September, Strasbourg sees daytime highs around 20°C and nights near 11°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Strasbourg in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Strasbourg peaks around July 14 at about 8 (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 14UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May6High
Jun7High
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Strasbourg 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 Strasbourg is worst in April — around 18 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 11 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Strasbourg's WHO annual average of 14 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1318 µg/m³Dec 1011 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar17Moderate
Apr18Moderate
May16Moderate
Jun17Moderate
Jul13Moderate
Aug14Moderate
Sep14Moderate
Oct12Moderate
Nov11Good
Dec11Good
Location & terrain

Where is Strasbourg?

Strasbourg sits at 48.6°N, 7.7°E, 147 m above sea level, in France. The nearest listed city is Schiltigheim, 3.0 km away.

Topography around Strasbourg

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

Within 3 km, the terrain around Strasbourg has only modest variations in elevation — a maximum elevation change of 32 m around an average of 143 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 112 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,341 m.

The land around Strasbourg is covered by artificial surfaces (66%) and trees (25%) within 3 km, cropland (42%) and trees (25%) within 16 km, and trees (57%) within 80 km.

3 km
32 m
16 km
112 m
80 km
1,341 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Schiltigheim 3.0 km · Bischheim 4.0 km · Kehl 5.0 km · Lingolsheim 5.0 km · Illkirch-Graffenstaden 7.0 km · Offenburg 19 km · Achern 25 km · Oberkirch 25 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 Strasbourg (48.5839°, 7.7455°, elevation 147 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. 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).