Vallensbæk weather in September

In September, Vallensbæk sees average daytime highs of 16°C and overnight lows near 13°C, with 67 mm of rain across 10.5 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 14°C by the end. The sky is clear or mostly clear about 21% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 36 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Vallensbæk's 6th-clearest and 7th-windiest month. For the whole year in context, see Vallensbæk's year-round climate.

Daytime high
16°
4th warmest
Overnight low
13°
10th coldest
Rainfall
67 mm
10.5 wet days
Daylight
12 h 30 min
5:51 AM – 6:18 PM
Cloud cover
64%
6th clearest
Wind
21 km/h
7th windiest
Solar energy
2.86 kWh/m²
Travel score
4.8
out of 10

Vallensbæk is suburb in Capital Region, Denmark.

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 17°C in the first days to 14°C by the end.

A typical September day in Vallensbæk reaches about 16°C in the afternoon and slips back to 13°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 18°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11815
21815
31815
41714
51714
61714
71714
81714
91714
101714
111714
121614
131613
141613
151613
161613
171613
181613
191613
201513
211513
221512
231512
241512
251512
261512
271512
281412
291412
301412

How September really feels in Vallensbæk

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.

Vallensbæk weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5912.33.97.40.0
Feb / 469.849.20.0
Mar / 449.22.311.40.1
Apr / 378.50.413.81.5
May13° / 489.2015.93.7
Jun17° / 13°6310017.15.3
Jul19° / 16°6310.4016.66.2
Aug19° / 16°7211.6014.86.0
Sep16° / 13°6710.5012.54.8
Oct12° / 7212.9010.12.8
Nov / 6513.10.881.1
Dec / 6613.12.66.90.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24654
34654
44654
54654
64654
74654
84555
94555
104555
114456
124456
134357
144357
154258
164258
174159
184159
194060
203961
213961
223961
233961
243862
253862
263862
273862
283862
293763
303763

Chance of precipitation in September

Any precipitation

Vallensbæk gets around 67 mm of rain over 10.5 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 38% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
238
338
438
537
637
737
837
937
1037
1136
1236
1336
1436
1535
1635
1735
1834
1934
2034
2134
2234
2334
2434
2535
2635
2736
2837
2937
3038

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 71% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1504181
2524071
3534061
4543961
5563851
6573751
7603550
8623440
9633340
10653140
11663040
12692830
13702730
14712630
15732430
16752320
17762220
18772120
19792010
20792010
21801910
22811810
23821800
24831700
25831700
26841600
27841600
28851500
29861400
30871300

Wind in September

Winds average 21 km/h in September.

Across September, daily wind ranges from about 20 km/h on the calmest days to 22 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
120light breeze
220light breeze
320breezy
420breezy
520breezy
620breezy
721breezy
821breezy
921breezy
1021breezy
1121breezy
1221breezy
1321breezy
1421breezy
1521breezy
1621breezy
1721breezy
1821breezy
1921breezy
2021breezy
2121breezy
2221breezy
2321breezy
2421breezy
2521breezy
2621breezy
2722breezy
2822breezy
2922breezy
3022breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 36 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 132 minutes over September. Sunrise moves from 5:22 AM to 6:19 AM, and sunset from 6:59 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:226:59
213.55:246:56
313.55:266:53
413.45:276:51
513.35:296:48
613.25:316:45
713.25:336:43
813.15:356:40
913.05:376:37
1012.95:396:35
1112.85:416:32
1212.85:436:29
1312.75:456:27
1412.65:476:24
1512.55:496:21
1612.55:516:18
1712.45:536:16
1812.35:556:13
1912.25:576:10
2012.15:596:07
2112.16:016:05
2212.06:036:02
2311.96:055:59
2411.86:075:57
2511.76:095:54
2611.76:115:51
2711.66:135:48
2811.56:155:46
2911.46:175:43
3011.46:195:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.86 kWh/m².

For context, solar energy here swings from a low near 0.37 kWh/m² to a high of 5.62 kWh/m² in June across the year — September's 2.86 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.5Moderate
33.5Moderate
43.4Moderate
53.4Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.1Moderate
113.1Moderate
123.0Moderate
133.0Moderate
142.9Moderate
152.9Moderate
162.8Moderate
172.8Moderate
182.7Moderate
192.7Moderate
202.6Moderate
212.6Moderate
222.5Moderate
232.5Moderate
242.4Moderate
252.4Moderate
262.3Moderate
272.3Moderate
282.2Moderate
292.2Moderate
302.1Moderate
Planning a trip in September

Is September a good time to visit Vallensbæk?

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

4.8
Sightseeing
4th-best month of the year
0.7
Beach & pool
4th-best month of the year

September is a reasonable time to visit Vallensbæk for sightseeing.

What to pack for Vallensbæk in September

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

In September, Vallensbæk sees daytime highs around 16°C and nights near 13°C. Worth packing: a warm layer, rain gear and a windbreaker. About 11 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Vallensbæk in September

The nearest coast averages about 15°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 18°C and coldest in February near 2°C.

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

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan3Bracing
Feb2Bracing
Mar3Bracing
Apr6Bracing
May10Bracing
Jun14Bracing
Jul17Cool
Aug18Cool
Sep15Cool
Oct12Bracing
Nov9Bracing
Dec5Bracing

UV index in Vallensbæk in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vallensbæk peaks around June 23 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 23UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5Moderate
Jun5High
Jul5High
Aug5Moderate
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Vallensbæk?

Vallensbæk sits at 55.6°N, 12.4°E, 3 m above sea level, in Denmark. The nearest listed city is Ishøj, 2.0 km away.

Topography around Vallensbæk

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

Within 3 km, the terrain around Vallensbæk has only modest variations in elevation — a maximum elevation change of 24 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 79 m; within 80 km, significant variations in elevation — a maximum elevation change of 270 m.

The land around Vallensbæk is covered by grassland (30%), artificial surfaces (29%) and water (21%) within 3 km, water (31%) and artificial surfaces (23%) within 16 km, and water (44%) and cropland (28%) within 80 km.

3 km
24 m
16 km
79 m
80 km
270 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Ishøj 2.0 km · Brøndbyvester 3.0 km · Albertslund 4.0 km · Avedøre 5.0 km · Glostrup 5.0 km · Taastrup 6.0 km · Hvidovre 6.0 km · Greve 7.0 km

Denmark travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E / F / K
230 V · 50 Hz
Prices
≈ 92% of US
price level, 2025
GDP per capita
$76,970
2025
Happiness
7.5 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
3.7
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 611
Religion
Evangelical Lutheran 71%other/none/unspecified 24%Muslim 4%

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 Vallensbæk (55.622°, 12.3851°, elevation 3 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).