Julianadorp weather in September

In September, Julianadorp sees average daytime highs of 17°C and overnight lows near 15°C, with 96 mm of rain across 13.7 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 16°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 30 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Julianadorp's 6th-clearest and 7th-windiest month. For the whole year in context, see Julianadorp's year-round climate.

Daytime high
17°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
96 mm
13.7 wet days
Daylight
12 h 24 min
6:23 AM – 6:48 PM
Cloud cover
64%
6th clearest
Wind
26 km/h
7th windiest
Solar energy
3.19 kWh/m²
Travel score
4.9
out of 10

Julianadorp is village in Den Helder, Netherlands.

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 18°C in the first days to 16°C by the end.

A typical September day in Julianadorp reaches about 17°C in the afternoon and slips back to 15°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 19°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)
11816
21816
31816
41816
51816
61816
71816
81816
91716
101715
111715
121715
131715
141715
151715
161715
171715
181715
191715
201715
211615
221615
231614
241614
251614
261614
271614
281614
291614
301614

How September really feels in Julianadorp

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.

Julianadorp weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 73140.87.90.5
Feb / 5511.11.49.50.3
Mar / 4910.80.611.50.9
Apr / 388.2013.62.1
May13° / 11°509.3015.53.5
Jun15° / 14°5910.4016.64.6
Jul18° / 16°7111.5016.15.7
Aug19° / 17°9513.1014.55.7
Sep17° / 15°9613.7012.44.9
Oct14° / 12°10515.2010.33.4
Nov10° / 9316.60.28.42.0
Dec / 8815.60.77.41.0

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 59%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24753
34753
44753
54753
64654
74654
84654
94555
104456
114456
124357
134357
144357
154258
164258
174258
184258
194060
204060
214060
223862
233862
243763
253565
263565
273565
283367
293367
303367

Chance of precipitation in September

Any precipitation

Julianadorp gets around 96 mm of rain over 13.7 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 46% and peaks near 51% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
146
246
346
446
546
646
746
846
946
1046
1146
1245
1345
1445
1545
1645
1745
1845
1945
2045
2145
2246
2346
2447
2548
2649
2750
2850
2951
3051

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 59% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14539151
24638151
34738151
44837141
54936140
65135140
75234140
85234140
95333140
105532130
115631130
125830120
135830120
146029110
156129100
16632890
17632890
18642880
19652870
20662860
21652960
22662950
23672940
24663040
25673030
26682930
27692920
28692920
29712810
30722710

Wind in September

Winds average 26 km/h in September.

Across September, daily wind ranges from about 25 km/h on the calmest days to 27 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
125breezy
225breezy
325breezy
425breezy
525breezy
626breezy
726breezy
826breezy
926breezy
1026breezy
1126breezy
1226breezy
1326breezy
1426breezy
1526breezy
1626breezy
1726breezy
1826breezy
1926breezy
2026breezy
2126breezy
2226breezy
2326breezy
2426breezy
2526breezy
2627breezy
2727breezy
2827breezy
2927breezy
3027breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 30 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 126 minutes over September. Sunrise moves from 5:57 AM to 6:48 AM, and sunset from 7:25 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:577:25
213.45:597:22
313.36:007:20
413.36:027:17
513.26:047:15
613.16:067:12
713.06:077:10
813.06:097:08
912.96:117:05
1012.86:137:03
1112.86:147:00
1212.76:166:58
1312.66:186:55
1412.66:206:53
1512.56:216:50
1612.46:236:48
1712.36:256:45
1812.36:276:43
1912.26:286:40
2012.16:306:38
2112.16:326:35
2212.06:346:33
2311.96:356:30
2411.86:376:28
2511.86:396:25
2611.76:416:23
2711.66:436:20
2811.66:446:18
2911.56:466:15
3011.46:486:13

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.19 kWh/m².

For context, solar energy here swings from a low near 0.55 kWh/m² to a high of 5.97 kWh/m² in June across the year — September's 3.19 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.8Moderate
43.8Moderate
53.7Moderate
63.7Moderate
73.6Moderate
83.6Moderate
93.5Moderate
103.5Moderate
113.4Moderate
123.4Moderate
133.3Moderate
143.3Moderate
153.2Moderate
163.2Moderate
173.1Moderate
183.1Moderate
193.0Moderate
203.0Moderate
212.9Moderate
222.9Moderate
232.8Moderate
242.8Moderate
252.7Moderate
262.7Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
Planning a trip in September

Is September a good time to visit Julianadorp?

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

4.9
Sightseeing
3rd-best month of the year
1.1
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Julianadorp for sightseeing.

What to pack for Julianadorp in September

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

In September, Julianadorp sees daytime highs around 17°C and nights near 15°C. Pack rain gear. Worth having: a warm layer and a windbreaker. About 14 days see rain.

rain geara warm layera windbreaker

Sea temperature near Julianadorp 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 offshore is warmest in August at about 19°C and coldest in February near 6°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
Jan6Bracing
Feb6Bracing
Mar6Bracing
Apr8Bracing
May11Bracing
Jun15Bracing
Jul17Cool
Aug19Cool
Sep17Cool
Oct15Bracing
Nov11Bracing
Dec8Bracing

UV index in Julianadorp 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 Julianadorp peaks around July 14 at about 6 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 14UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May5High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Julianadorp?

Julianadorp sits at 52.9°N, 4.7°E, 2 m above sea level, in The Netherlands. The nearest listed city is Den Helder, 8.0 km away.

BergenHeerhugowaardMedemblikAlkmaarHeilooHoorn

Topography around Julianadorp

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

Within 3 km, the terrain around Julianadorp has only modest variations in elevation — a maximum elevation change of 24 m around an average of 1 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 27 m; within 80 km, only modest variations in elevation — a maximum elevation change of 68 m.

The land around Julianadorp is covered by cropland (49%) and grassland (21%) within 3 km, water (57%) within 16 km, and water (57%) and grassland (21%) within 80 km.

3 km
24 m
16 km
27 m
80 km
68 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Den Helder 8.0 km · Schagen 12 km · Bergen 25 km · Heerhugowaard 25 km · Medemblik 28 km · Alkmaar 29 km · Heiloo 32 km · Hoorn 35 km

The Netherlands travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 84% of US
price level, 2025
GDP per capita
$73,684
2025
Happiness
7.2 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
4
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 624
Religion
none 54%Roman Catholic 20%Protestant 15%other 6%

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 Julianadorp (52.89°, 4.7403°, elevation 2 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).