The Netherlands · 1991–2020

Best time to visit
Assendelft.

July leads for comfortable weather in Assendelft: typically 21.6°C by day, 13.5°C at night, with 70 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high21.6°C

Typical low13.5°C

Rain in July70 mm

Comfort

July

July · August · June

78climate match

Beach

July

July · August · June

43climate match

Outdoors

June

June · May · September

86climate match

The weakest month is January, scoring 5 against July’s 78 — days reach only 6.4°C, 18° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

56.4° / 2.1°

Feb

96.7° / 1.6°

Mar

239.5° / 2.6°

Apr

4413.8° / 4.9°

May

5716.7° / 8.2°

Jun

7119.4° / 11.3°

Jul

7821.6° / 13.5°

Aug

7421.7° / 14°

Sep

6419.1° / 11.6°

Oct

4115.1° / 8.8°

Nov

2310.8° / 5.6°

Dec

77.5° / 2.9°

Monthly climate evidence for Assendelft — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 19 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	6.4°C	2.1°C	70 mm	13.2	6.1°C	8 h 09	5	Good coverage
February	6.7°C	1.6°C	54 mm	10.5	5.4°C	9 h 48	9	Good coverage
March	9.5°C	2.6°C	45 mm	8.5	6.1°C	11 h 41	23	Good coverage
April	13.8°C	4.9°C	35 mm	7.8	8.4°C	13 h 50	44	Good coverage
May	16.7°C	8.2°C	45 mm	8.5	11.5°C	15 h 42	57	Good coverage
June	19.4°C	11.3°C	51 mm	8.8	14.7°C	16 h 47	71	Good coverage
July	21.6°C	13.5°C	70 mm	10.1	17.2°C	16 h 21	78	Good coverage
August	21.7°C	14°C	101 mm	11.3	18.6°C	14 h 42	74	Good coverage
September	19.1°C	11.6°C	84 mm	10.6	17.3°C	12 h 35	64	Good coverage
October	15.1°C	8.8°C	101 mm	12.9	14.6°C	10 h 31	41	Good coverage
November	10.8°C	5.6°C	82 mm	14.2	11.2°C	8 h 39	23	Good coverage
December	7.5°C	2.9°C	83 mm	14.4	8.2°C	7 h 41	7	Good coverage

Records at WIJK AAN ZEE, 2001–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.8°C1 Jan 2022	-12.8°C25 Jan 2013	31 mm2 Jan 2003	132 mm2004 · driest 15 mm in 2006	25
February	19.6°C26 Feb 2019	-15.9°C4 Feb 2012	29 mm16 Feb 2020	126 mm2024 · driest 14 mm in 2003	25
March	22.0°C21 Mar 2025	-13.5°C4 Mar 2005	18 mm31 Mar 2023	131 mm2008 · driest 3 mm in 2025	25
April	29.1°C15 Apr 2007	-6.8°C8 Apr 2003	24 mm30 Apr 2018	82 mm2018 · driest 1 mm in 2007	25
May	31.4°C27 May 2017	-2.2°C14 May 2010	30 mm21 May 2024	166 mm2024 · driest 12 mm in 2020	26
June	37.8°C26 Jun 2026	1.8°C17 Jun 2008	88 mm18 Jun 2021	195 mm2021 · driest 7 mm in 2018	26
July	37.3°C19 Jul 2022	5.3°C6 Jul 2004	44 mm14 Jul 2011	163 mm2011 · driest 9 mm in 2018	25
August	33.4°C7 Aug 2020	5.5°C29 Aug 2007	57 mm14 Aug 2006	232 mm2006 · driest 11 mm in 2009	25
September	32.1°C13 Sep 2016	3.3°C23 Sep 2012	45 mm6 Sep 2011	197 mm2017 · driest 7 mm in 2014	25
October	25.8°C13 Oct 2018	-5.5°C23 Oct 2003	50 mm5 Oct 2020	213 mm2006 · driest 18 mm in 2015	25
November	19.3°C6 Nov 2018	-7.3°C29 Nov 2016	35 mm17 Nov 2022	186 mm2023 · driest 5 mm in 2011	25
December	16.6°C17 Dec 2015	-8.9°C20 Dec 2010	27 mm19 Dec 2023	145 mm2020 · driest 22 mm in 2016	25

Typical days per month at WIJK AAN ZEE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	9	2
February	0	0	9	1
March	0	0	8	1
April	<1	0	4	<1
May	2	<1	<1	1
June	3	<1	0	2
July	5	1	0	2
August	4	1	0	3
September	2	<1	0	3
October	<1	0	<1	3
November	0	0	3	2
December	0	0	9	2

How often, not how much — every day in WIJK AAN ZEE’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	43%	6%	58%	4.5–8.1°C
February	0%	37%	4%	48%	4.4–9.4°C
March	<1%	27%	3%	35%	8.1–12.2°C
April	9%	26%	3%	32%	11.3–16.1°C
May	19%	28%	5%	35%	14.3–18.8°C
June	30%	29%	6%	38%	18.0–21.6°C
July	47%	32%	6%	41%	20.0–22.9°C
August	53%	34%	10%	44%	19.9–23.2°C
September	29%	36%	9%	52%	17.5–21.6°C
October	5%	42%	11%	55%	13.7–17.1°C
November	0%	49%	9%	69%	9.8–12.4°C
December	0%	46%	7%	61%	5.5–9.0°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

2002Each stripe is one year’s mean temperature against the 24-year average. Warmest: 2024. Coolest: 2010.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2759631
NOAA station: NLE00152475 · WIJK AAN ZEE
Station distance: 10.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 52.47°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 19 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from WIJK AAN ZEE is what differs

Velsen-Zuid→Heemskerk→Beverwijk→Castricum→IJmuiden→Heiloo→

Or put two places side by side: Assendelft vs Velsen-Zuid

Best time to visitAssendelft.

July

July

June

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Assendelft.

The whole year,
without the guesswork.

Nearby, measured,
and named.