Holbæk weather in September

In September, Holbæk sees average daytime highs of 17°C and overnight lows near 10°C, with 56 mm of rain across 10.5 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 19°C in the first days to 15°C by the end. The sky is clear or mostly clear about 19% 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 18 min by month's end. Set against the rest of the year, September is Holbæk's 6th-clearest and 7th-windiest month. For the whole year in context, see Holbæk's year-round climate.

Daytime high
17°
4th warmest
Overnight low
10°
9th coldest
Rainfall
56 mm
10.5 wet days
Daylight
12 h 30 min
5:54 AM – 6:21 PM
Cloud cover
66%
6th clearest
Wind
17 km/h
7th windiest
Solar energy
2.94 kWh/m²
Travel score
5.2
out of 10

Holbæk is town in Denmark.

Founded
1236

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 19°C in the first days to 15°C by the end.

A typical September day in Holbæk reaches about 17°C in the afternoon and slips back to 10°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 21°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11912
21912
31912
41912
51912
61811
71811
81811
91811
101811
111811
121811
131711
141711
151710
161710
171710
181710
191710
201610
211610
221610
231610
241610
25169
26169
27159
28159
29159
30159

How September really feels in Holbæk

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.

Holbæk weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°4711.23.87.40.0
Feb / -1°3893.89.20.0
Mar / 419.62.511.40.6
Apr11° / 409.30.313.82.8
May16° / 5311015.94.8
Jun19° / 11°6811.2017.15.8
Jul21° / 13°7111.5016.76.3
Aug21° / 13°7212.6014.86.1
Sep17° / 10°5610.5012.55.2
Oct12° / 5811.4010.13.0
Nov / 4710.70.981.0
Dec / 5011.22.86.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% 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 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14060
23961
33961
44060
54060
64060
74060
84060
94060
104060
113961
123961
133862
143862
153862
163763
173664
183664
193664
203664
213664
223664
233565
243565
253664
263664
273664
283664
293565
303466

Chance of precipitation in September

Any precipitation

Holbæk gets around 56 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 40% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
140
239
339
439
539
638
738
838
937
1037
1136
1236
1336
1435
1535
1635
1734
1834
1934
2033
2133
2233
2333
2433
2534
2634
2735
2835
2935
3035

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 82% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
167285
269274
369274
471263
571263
673252
774242
875232
976231
1077221
1178211
1279201
1380191
1481181
1582171
1684160
1785150
1886140
1987130
2088120
2189110
2289110
2390100
2490100
259190
269190
279280
289280
299280
309370

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light 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
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 36 min at the start of September to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 138 minutes over September. Sunrise moves from 5:24 AM to 6:22 AM, and sunset from 7:02 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:247:02
213.55:266:59
313.55:286:56
413.45:306:54
513.35:326:51
613.25:346:48
713.25:366:46
813.15:386:43
913.05:406:40
1012.95:426:37
1112.85:446:35
1212.85:466:32
1312.75:486:29
1412.65:506:27
1512.55:526:24
1612.55:546:21
1712.45:566:18
1812.35:586:16
1912.26:006:13
2012.16:026:10
2112.16:046:07
2212.06:066:05
2311.96:086:02
2411.86:105:59
2511.76:125:56
2611.76:145:54
2711.66:165:51
2811.56:185:48
2911.46:205:46
3011.36:225:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.94 kWh/m².

For context, solar energy here swings from a low near 0.38 kWh/m² to a high of 5.88 kWh/m² in June across the year — September's 2.94 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.6Moderate
33.6Moderate
43.5Moderate
53.5Moderate
63.4Moderate
73.4Moderate
83.3Moderate
93.3Moderate
103.2Moderate
113.2Moderate
123.1Moderate
133.0Moderate
143.0Moderate
153.0Moderate
162.9Moderate
172.9Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.6Moderate
222.6Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.4Moderate
272.4Moderate
282.3Moderate
292.3Moderate
302.2Moderate
Planning a trip in September

Is September a good time to visit Holbæk?

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

5.2
Sightseeing
4th-best month of the year
1.3
Beach & pool
4th-best month of the year

September is a reasonable time to visit Holbæk for sightseeing.

What to pack for Holbæk in September

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

In September, Holbæk sees daytime highs around 17°C and nights near 10°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Holbæk in September

The nearest coast averages about 16°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 20 km away) is warmest in August at about 19°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°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan3Bracing
Feb2Bracing
Mar3Bracing
Apr6Bracing
May11Bracing
Jun15Cool
Jul18Cool
Aug19Cool
Sep16Cool
Oct12Bracing
Nov8Bracing
Dec5Bracing

UV index in Holbæk 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 Holbæk peaks around June 20 at about 6 (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 20UV 6Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5Moderate
Jun6High
Jul5High
Aug5Moderate
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Holbæk?

Holbæk sits at 55.7°N, 11.7°E, 15 m above sea level, in Denmark. The nearest listed city is Roskilde, 25 km away.

FrederikssundStenløseRingstedTaastrupSolrød StrandKalundborgGreve

Topography around Holbæk

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

Within 3 km, the terrain around Holbæk has only modest variations in elevation — a maximum elevation change of 54 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 120 m; within 80 km, only modest variations in elevation — a maximum elevation change of 197 m.

The land around Holbæk is covered by water (34%), grassland (22%) and artificial surfaces (21%) within 3 km, cropland (42%) and grassland (20%) within 16 km, and water (61%) within 80 km.

3 km
54 m
16 km
120 m
80 km
197 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Roskilde 25 km · Frederikssund 26 km · Stenløse 31 km · Ringsted 31 km · Taastrup 38 km · Solrød Strand 38 km · Kalundborg 39 km · Greve 40 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 Holbæk (55.7175°, 11.7128°, elevation 15 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).