Haarlem climate

Name: Haarlem
Address: NL

Haarlem is warmest in August, with average highs of 20 °C, and coldest in February, when nights average 2.2 °C. August is the wettest month (91 mm) and April the driest (45 mm). Figures are 1991–2020 climate normals.

Across a full year Haarlem averages 847 mm of rain, 8 days above 25 °C and 26 days below freezing.

The Netherlands · population 162,543 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 20 °C
Coldest month February 2.2 °C
Driest month April 45 mm
Wettest month August 91 mm
Least cloud July 59 % cloud
Hottest on record July 35 °C
Coldest on record January -12 °C
Warmest sea August 19 °C

What to expectHaarlem through the year

Haarlem has a clear annual cycle: average daily highs run from 6.2 °C in February to 20 °C in August, a swing of 14 °C in mean temperature across the year.

Counted across a normal year, 8 days a year reach 25 °C, 1 of them reach 30 °C, 26 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in July.

Rain is strongly seasonal. August averages 91 mm against 45 mm in April — 2.0 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Haarlem is warmest in August at 19 °C and coldest in February at 5.5 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	5.9 °C	69 mm	73 %
February	6.2 °C	55 mm	71 %
March	8.7 °C	52 mm	67 %
April	12.1 °C	45 mm	61 %
May	15.4 °C	58 mm	61 %
June	17.9 °C	64 mm	63 %
July	20.1 °C	80 mm	59 %
August	20.3 °C	91 mm	61 %
September	17.7 °C	84 mm	64 %
October	13.9 °C	90 mm	70 %
November	9.7 °C	79 mm	75 %
December	6.7 °C	80 mm	75 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days below 0 °C
January	5.9 °C	2.4 °C	4.1 °C	13.9 °C	-11.7 °C	0	8
February	6.2 °C	2.2 °C	4.2 °C	16.9 °C	-11.4 °C	0	7
March	8.7 °C	3.8 °C	6.2 °C	19.6 °C	-10.7 °C	0	3
April	12.1 °C	6.2 °C	9.1 °C	25.4 °C	-2.8 °C	0	0
May	15.4 °C	9.7 °C	12.6 °C	29.7 °C	2.1 °C	0	0
June	17.9 °C	12.6 °C	15.3 °C	31.2 °C	6.9 °C	1	0
July	20.1 °C	14.9 °C	17.6 °C	34.6 °C	9.6 °C	3	0
August	20.3 °C	15.2 °C	17.8 °C	31.7 °C	9.8 °C	3	0
September	17.7 °C	13.1 °C	15.3 °C	29.3 °C	6.5 °C	0	0
October	13.9 °C	9.8 °C	11.8 °C	24.7 °C	-0.1 °C	0	0
November	9.7 °C	6.2 °C	7.9 °C	18.5 °C	-4.6 °C	0	1
December	6.7 °C	3.4 °C	5.1 °C	13.9 °C	-9.1 °C	0	6

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	69 mm	13	8.2 h/day	73 %	84 %	30 km/h	6.2 °C
February	55 mm	11	9.9 h/day	71 %	82 %	29 km/h	5.5 °C
March	52 mm	11	12 h/day	67 %	80 %	27 km/h	6.2 °C
April	45 mm	10	14 h/day	61 %	78 %	24 km/h	8.4 °C
May	58 mm	10	16 h/day	61 %	77 %	24 km/h	11.6 °C
June	64 mm	11	17 h/day	63 %	78 %	23 km/h	14.7 °C
July	80 mm	13	16 h/day	59 %	79 %	23 km/h	17.3 °C
August	91 mm	13	15 h/day	61 %	79 %	23 km/h	18.7 °C
September	84 mm	13	13 h/day	64 %	80 %	24 km/h	17.5 °C
October	90 mm	14	11 h/day	70 %	81 %	27 km/h	14.8 °C
November	79 mm	15	8.8 h/day	75 %	84 %	28 km/h	11.3 °C
December	80 mm	14	7.7 h/day	75 %	85 %	29 km/h	8.2 °C

How Haarlem compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Haarlem	20 °C	2.2 °C	847 mm	8
Amsterdam · The Netherlands	21 °C	1.6 °C	794 mm	12
The Hague · The Netherlands	21 °C	2.1 °C	795 mm	9
Utrecht · The Netherlands	22 °C	1.1 °C	778 mm	17

Where Haarlem ranks

Ranking	Position	Value
The coolest places in Europe in July	39thof 50	20 °C
The coolest places in Europe in June	43rdof 50	18 °C

Planning a trip? See the best time to visit Haarlem.

QuestionsCommon questions about Haarlem’s climate

When is the best time to visit Haarlem?

That depends on what you want, so the honest answer is a comparison rather than a single month. July, August, September sit closest to 20 °C on average, August is the warmest month and April the driest. The month-by-month table above has the full picture.

How hot does Haarlem get?

In August, the warmest month, daily highs average 20 °C. About 1 days a year pass 30 °C. The highest value in the 1991–2020 record is 35 °C.

How cold does it get in winter?

Nights average 2.2 °C in February, the coldest month. A normal year has 26 nights below freezing.

Which month is wettest in Haarlem?

August, averaging 91 mm over 13 days with rain. The driest month is April with 45 mm. The year as a whole averages 847 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Haarlem rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.