Harlingen weather in September

In September, Harlingen sees average daytime highs of 17°C and overnight lows near 14°C, with 92 mm of rain across 13.4 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 3rd-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 19% 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 Harlingen's 6th-clearest and 7th-windiest month. For the whole year in context, see Harlingen's year-round climate.

Daytime high
17°
3rd warmest
Overnight low
14°
10th coldest
Rainfall
92 mm
13.4 wet days
Daylight
12 h 24 min
6:20 AM – 6:45 PM
Cloud cover
64%
6th clearest
Wind
23 km/h
7th windiest
Solar energy
3.07 kWh/m²
Travel score
4.9
out of 10

Harlingen is town in Friesland, the Netherlands.

Density
644/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 18°C in the first days to 16°C by the end.

A typical September day in Harlingen reaches about 17°C in the afternoon and slips back to 14°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 20°C. Set against its neighbours, September runs about 2°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
41815
51815
61815
71815
81815
91815
101715
111715
121714
131714
141714
151714
161714
171714
181714
191714
201714
211614
221614
231613
241613
251613
261613
271613
281613
291613
301513

How September really feels in Harlingen

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.

Harlingen weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 731417.90.2
Feb / 5411.31.49.40.1
Mar / 5111.20.711.50.9
Apr10° / 408.9013.62.4
May13° / 10°5710.4015.63.9
Jun16° / 13°6711.5016.64.9
Jul19° / 16°8412.5016.25.8
Aug19° / 16°10114014.55.6
Sep17° / 14°9213.4012.44.9
Oct13° / 11°9614.9010.33.3
Nov10° / 8715.80.18.41.7
Dec / 8615.10.97.40.7

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 21% of September, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24456
34456
44456
54456
64456
74456
84258
94258
104258
114258
124159
134159
144159
154159
164159
174159
184060
194060
203961
213862
223763
233763
243763
253664
263466
273466
283466
293367
303268

Chance of precipitation in September

Any precipitation

Harlingen gets around 92 mm of rain over 13.4 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 50% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
147
247
347
446
546
646
746
845
945
1045
1145
1244
1344
1443
1543
1643
1743
1843
1943
2044
2144
2245
2345
2446
2547
2648
2748
2849
2950
3050

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 63% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14639141
24838131
34937131
45037131
55136130
65335120
75434120
85533120
95632120
105831110
115930110
126129100
136129100
14632890
15642880
16662770
17662770
18672760
19682750
20682750
21692740
22702730
23702730
24712720
25712720
26712720
27732610
28732610
29742510
30752410

Wind in September

Winds average 23 km/h in September.

Across September, daily wind ranges from about 22 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
122breezy
222breezy
323breezy
423breezy
523breezy
623breezy
723breezy
823breezy
923breezy
1023breezy
1123breezy
1223breezy
1323breezy
1423breezy
1523breezy
1623breezy
1723breezy
1823breezy
1923breezy
2023breezy
2123breezy
2223breezy
2323breezy
2423breezy
2523breezy
2623breezy
2723breezy
2824breezy
2924breezy
3024breezy

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 5:54 AM to 6:45 AM, and sunset from 7:22 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:547:22
213.45:557:20
313.35:577:17
413.35:597:15
513.26:017:13
613.16:037:10
713.16:047:08
813.06:067:05
912.96:087:03
1012.86:107:00
1112.86:116:58
1212.76:136:55
1312.66:156:53
1412.66:176:50
1512.56:186:48
1612.46:206:45
1712.36:226:42
1812.36:246:40
1912.26:266:37
2012.16:276:35
2112.16:296:32
2212.06:316:30
2311.96:336:27
2411.86:356:25
2511.86:366:22
2611.76:386:20
2711.66:406:17
2811.66:426:15
2911.56:446:12
3011.46:456:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.07 kWh/m².

For context, solar energy here swings from a low near 0.52 kWh/m² to a high of 5.77 kWh/m² in June across the year — September's 3.07 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.7Moderate
33.7Moderate
43.6Moderate
53.6Moderate
63.5Moderate
73.5Moderate
83.4Moderate
93.4Moderate
103.3Moderate
113.3Moderate
123.2Moderate
133.2Moderate
143.1Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
192.9Moderate
202.9Moderate
212.8Moderate
222.8Moderate
232.7Moderate
242.7Moderate
252.6Moderate
262.6Moderate
272.5Moderate
282.5Moderate
292.4Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Harlingen?

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 Harlingen for sightseeing.

What to pack for Harlingen in September

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

In September, Harlingen sees daytime highs around 17°C and nights near 14°C. Pack rain gear. Worth having: a warm layer and a windbreaker. About 13 days see rain.

rain geara warm layera windbreaker

Sea temperature near Harlingen 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 5°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
Feb5Bracing
Mar6Bracing
Apr9Bracing
May12Bracing
Jun15Cool
Jul18Cool
Aug19Cool
Sep17Cool
Oct14Bracing
Nov11Bracing
Dec8Bracing

UV index in Harlingen 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 Harlingen peaks around June 23 at about 6 (high) — a little sun protection helps at midday. 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 23UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May5High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low
Location & terrain

Where is Harlingen?

Harlingen sits at 53.2°N, 5.4°E, 3 m above sea level, in The Netherlands. The nearest listed city is Sneek, 22 km away.

SneekLeeuwardenHeerenveenDrachtenMedemblikDen HelderEnkhuizenJulianadorp

Topography around Harlingen

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

Within 3 km, the terrain around Harlingen has only modest variations in elevation — a maximum elevation change of 11 m around an average of 0 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 17 m; within 80 km, only modest variations in elevation — a maximum elevation change of 65 m.

The land around Harlingen is covered by water (47%) and grassland (23%) within 3 km, water (55%) and grassland (30%) within 16 km, and water (54%) and grassland (26%) within 80 km.

3 km
11 m
16 km
17 m
80 km
65 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Sneek 22 km · Leeuwarden 26 km · Heerenveen 41 km · Drachten 46 km · Medemblik 50 km · Den Helder 50 km · Enkhuizen 53 km · Julianadorp 56 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 Harlingen (53.1748°, 5.4224°, 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).