Rouen weather in September

In September, Rouen sees average daytime highs of 19°C and overnight lows near 11°C, with 52 mm of rain across 9.4 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 12th-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 20% 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 Rouen's 3rd-clearest and 9th-windiest month. For the whole year in context, see Rouen's year-round climate.

Daytime high
19°
4th warmest
Overnight low
11°
9th coldest
Rainfall
52 mm
9.4 wet days
Daylight
12 h 24 min
6:39 AM – 7:01 PM
Cloud cover
65%
3rd clearest
Wind
12 km/h
9th windiest
Solar energy
3.42 kWh/m²
Travel score
6.1
out of 10

Rouen is commune in Seine-Maritime, France.

Air quality
Moderate
PM2.5 12.9 µg/m³ · 2019
Density
5,441/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 21°C in the first days to 18°C by the end.

A typical September day in Rouen reaches about 19°C in the afternoon and slips back to 11°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12112
22112
32112
42112
52012
62012
72012
82012
92012
102011
112011
122011
132011
142011
151911
161911
171911
181911
191911
201911
211911
221910
231910
241810
251810
261810
271810
281810
291810
301810

How September really feels in Rouen

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.

Rouen weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6311.80.98.40.8
Feb / 56111.29.81.1
Mar11° / 6011.50.411.52.6
Apr14° / 6311.30.213.43.9
May17° / 6612.1015.15.1
Jun20° / 12°65110166.0
Jul22° / 13°5910.9015.66.6
Aug22° / 13°6510.7014.26.6
Sep19° / 11°529.4012.46.1
Oct15° / 7312.3010.54.2
Nov10° / 6912.70.28.92.2
Dec / 8113.3181.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% 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 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23763
33763
43763
53763
63763
73763
83763
93763
103763
113664
123664
133763
143862
153862
163862
173862
183961
193961
203862
213763
223763
233763
243664
253664
263367
273367
283268
293169
303070

Chance of precipitation in September

Any precipitation

Rouen gets around 52 mm of rain over 9.4 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 32% and peaks near 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
129
228
328
428
528
628
728
829
929
1029
1130
1230
1330
1430
1530
1630
1731
1831
1932
2032
2133
2233
2334
2435
2536
2637
2738
2839
2939
3040

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 69% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15534101
2573391
3593290
4603280
5613180
6623080
7642970
8642970
9652870
10662770
11682660
12682660
13702550
14712450
15712450
16732340
17732340
18742330
19742330
20752320
21752320
22742420
23742420
24752410
25742510
26742510
27742510
28752410
29752410
30752410

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

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 6:17 AM to 7:00 AM, and sunset from 7:34 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.36:177:34
213.26:187:32
313.26:207:30
413.16:217:28
513.06:237:25
613.06:247:23
712.96:267:21
812.96:277:19
912.86:297:16
1012.76:307:14
1112.76:327:12
1212.66:337:10
1312.56:357:08
1412.56:367:05
1512.46:387:03
1612.46:397:01
1712.36:416:59
1812.26:426:56
1912.26:446:54
2012.16:456:52
2112.06:476:49
2212.06:486:47
2311.96:506:45
2411.96:516:43
2511.86:536:41
2611.76:546:38
2711.76:566:36
2811.66:576:34
2911.56:596:32
3011.57:006:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.42 kWh/m².

For context, solar energy here swings from a low near 0.76 kWh/m² to a high of 5.69 kWh/m² in June across the year — September's 3.42 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.0Bright
24.0Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.8Moderate
73.8Moderate
83.7Moderate
93.7Moderate
103.6Moderate
113.6Moderate
123.6Moderate
133.5Moderate
143.5Moderate
153.4Moderate
163.4Moderate
173.4Moderate
183.3Moderate
193.3Moderate
203.2Moderate
213.2Moderate
223.1Moderate
233.1Moderate
243.0Moderate
253.0Moderate
262.9Moderate
272.9Moderate
282.8Moderate
292.8Moderate
302.7Moderate
Planning a trip in September

Is September a good time to visit Rouen?

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

6.1
Sightseeing
3rd-best month of the year
2.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Rouen for sightseeing.

What to pack for Rouen in September

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

In September, Rouen sees daytime highs around 19°C and nights near 11°C. Worth packing: rain gear. About 9 days see rain.

rain gear

Sea temperature near Rouen in September

The nearest coast averages about 18°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 51 km away) is warmest in August at about 18°C and coldest in February near 8°C.

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

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan8Bracing
Feb8Bracing
Mar8Bracing
Apr10Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep18Cool
Oct16Cool
Nov13Bracing
Dec10Bracing

UV index in Rouen 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 Rouen peaks around June 18 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 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 18UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7High
Jul6High
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Rouen 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 Rouen is worst in April — around 17 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 10 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Rouen's WHO annual average of 12.9 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodApr 1217 µg/m³Nov 1810 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar17Moderate
Apr17Moderate
May15Moderate
Jun14Moderate
Jul12Good
Aug12Moderate
Sep12Moderate
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Rouen?

Rouen sits at 49.4°N, 1.1°E, 21 m above sea level, in France. The nearest listed city is Mont-Saint-Aignan, 2.0 km away.

Topography around Rouen

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

Within 3 km, the terrain around Rouen has only modest variations in elevation — a maximum elevation change of 171 m around an average of 66 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 199 m; within 80 km, significant variations in elevation — a maximum elevation change of 292 m.

The land around Rouen is covered by artificial surfaces (54%) and trees (38%) within 3 km, trees (41%) and cropland (27%) within 16 km, and cropland (45%) and trees (23%) within 80 km.

3 km
171 m
16 km
199 m
80 km
292 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Mont-Saint-Aignan 2.0 km · Sotteville-lès-Rouen 4.0 km · Le Petit-Quevilly 4.0 km · Canteleu 5.0 km · Le Grand-Quevilly 6.0 km · Saint-Étienne-du-Rouvray 7.0 km · Elbeuf 19 km · Louviers 26 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 Rouen (49.4431°, 1.0993°, elevation 21 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).