Haarlem weather in September

In September, Haarlem sees average daytime highs of 18°C and overnight lows near 13°C, with 84 mm of rain across 12.7 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 19°C in the first days to 16°C by the end. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels dry.

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

Daytime high
18°
3rd warmest
Overnight low
13°
10th coldest
Rainfall
84 mm
12.7 wet days
Daylight
12 h 24 min
6:24 AM – 6:48 PM
Cloud cover
65%
6th clearest
Wind
18 km/h
7th windiest
Solar energy
3.09 kWh/m²
Travel score
5.2
out of 10

Haarlem is municipality in the Netherlands and capital city of North Holland.

Air quality
Good
PM10 18 µg/m³ · 2019
Density
5,065/km²
people per km²
Founded
1185

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 16°C by the end.

A typical September day in Haarlem reaches about 18°C in the afternoon and slips back to 13°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 21°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)
11914
21914
31914
41914
51914
61914
71814
81814
91814
101813
111813
121813
131813
141813
151813
161813
171813
181713
191713
201713
211712
221712
231712
241712
251712
261712
271612
281612
291612
301612

How September really feels in Haarlem

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.

Haarlem 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 / 6913.20.980.3
Feb / 5410.91.49.50.4
Mar / 5210.80.711.51.5
Apr12° / 4410.1013.63.0
May15° / 10°5810.4015.44.6
Jun18° / 13°6311.3016.55.5
Jul20° / 15°7913.1016.15.9
Aug20° / 15°9013.3014.55.9
Sep18° / 13°8412.7012.45.2
Oct14° / 10°8814.1010.33.6
Nov10° / 7714.80.28.51.8
Dec / 8014.30.97.50.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% 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 61%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24159
34159
44159
54159
64159
74159
84159
94060
104060
114060
124159
134060
144060
153961
163961
174060
183961
193961
203961
213862
223862
233763
243664
253664
263565
273466
283466
293367
303268

Chance of precipitation in September

Any precipitation

Haarlem gets around 84 mm of rain over 12.7 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 43% and peaks near 48% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
144
243
343
443
543
642
743
843
943
1043
1143
1243
1342
1442
1542
1642
1742
1842
1942
2042
2143
2243
2343
2444
2545
2645
2746
2847
2948
3048

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 61% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14540131
24640131
34839131
44938131
55037130
65136130
75235130
85434120
95533120
105632120
115732110
125931100
136030100
14613090
15632980
16642970
17652870
18662860
19672850
20682840
21682840
22682930
23682930
24692920
25692920
26702910
27712810
28712810
29722710
30732610

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 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 120 minutes over September. Sunrise moves from 5:58 AM to 6:48 AM, and sunset from 7:24 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:587:24
213.46:007:22
313.36:017:19
413.26:037:17
513.26:057:15
613.16:077:12
713.06:087:10
813.06:107:07
912.96:127:05
1012.86:137:03
1112.76:157:00
1212.76:176:58
1312.66:196:55
1412.56:206:53
1512.56:226:50
1612.46:246:48
1712.36:256:45
1812.36:276:43
1912.26:296:40
2012.16:316:38
2112.16:326:35
2212.06:346:33
2311.96:366:31
2411.86:386:28
2511.86:396:26
2611.76:416:23
2711.66:436:21
2811.66:456:18
2911.56:466:16
3011.46:486:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.09 kWh/m².

For context, solar energy here swings from a low near 0.57 kWh/m² to a high of 5.65 kWh/m² in June across the year — September's 3.09 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
123.3Moderate
133.2Moderate
143.2Moderate
153.1Moderate
163.1Moderate
173.0Moderate
183.0Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.7Moderate
252.6Moderate
262.6Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.4Moderate
Planning a trip in September

Is September a good time to visit Haarlem?

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
1.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Haarlem for sightseeing.

What to pack for Haarlem in September

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

In September, Haarlem sees daytime highs around 18°C and nights near 13°C. Worth packing: rain gear. About 13 days see rain.

rain gear

Sea temperature near Haarlem 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 18 km away) 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
May12Bracing
Jun15Bracing
Jul17Cool
Aug19Cool
Sep18Cool
Oct15Bracing
Nov11Bracing
Dec8Bracing

UV index in Haarlem 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 Haarlem peaks around June 23 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 23UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May5Moderate
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Haarlem?

Haarlem sits at 52.4°N, 4.6°E, 10 m above sea level, in The Netherlands. The nearest listed city is Heemstede, 4.0 km away.

Topography around Haarlem

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

Within 3 km, the terrain around Haarlem has only modest variations in elevation — a maximum elevation change of 52 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 64 m; within 80 km, only modest variations in elevation — a maximum elevation change of 99 m.

The land around Haarlem is covered by artificial surfaces (50%) and trees (35%) within 3 km, water (26%), grassland (24%) and artificial surfaces (22%) within 16 km, and water (40%) and grassland (27%) within 80 km.

3 km
52 m
16 km
64 m
80 km
99 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Heemstede 4.0 km · Velserbroek 6.0 km · Zandvoort 7.0 km · Velsen-Zuid 9.0 km · IJmuiden 9.0 km · Hoofddorp 9.0 km · Hillegom 11 km · Badhoevedorp 11 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 Haarlem (52.3808°, 4.6368°, elevation 10 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).