The Netherlands · 1991–2020

Best time to visit
Heerlen.

July leads for comfortable weather in Heerlen: typically 23.7°C by day, 14.4°C at night, with 79 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high23.7°C

Typical low14.4°C

Rain in July79 mm

Comfort

July

July · August · June

84climate match

Beach

July

July · August · June

49climate match

Outdoors

September

September · May · June

82climate match

The weakest month is January, scoring 5 against July’s 84 — days reach only 5.7°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

55.7° / 0.8°

Feb

76.8° / 1.2°

Mar

2410.6° / 3.4°

Apr

4414.7° / 5.8°

May

6018.5° / 9.3°

Jun

7521.4° / 12°

Jul

8423.7° / 14.4°

Aug

8323.3° / 14°

Sep

6719.4° / 11.2°

Oct

4514.8° / 7.7°

Nov

209.4° / 4.4°

Dec

55.6° / 1.2°

Monthly climate evidence for Heerlen — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.7°C	0.8°C	64 mm	11.6	8 h 24	5	Good coverage
February	6.8°C	1.2°C	63 mm	11	9 h 55	7	Good coverage
March	10.6°C	3.4°C	59 mm	11.3	11 h 42	24	Good coverage
April	14.7°C	5.8°C	53 mm	9.6	13 h 44	44	Good coverage
May	18.5°C	9.3°C	65 mm	11.2	15 h 29	60	Good coverage
June	21.4°C	12°C	70 mm	10	16 h 29	75	Good coverage
July	23.7°C	14.4°C	79 mm	11.7	16 h 06	84	Good coverage
August	23.3°C	14°C	81 mm	10.4	14 h 33	83	Good coverage
September	19.4°C	11.2°C	68 mm	10.2	12 h 33	67	Good coverage
October	14.8°C	7.7°C	66 mm	10.3	10 h 36	45	Good coverage
November	9.4°C	4.4°C	67 mm	12.2	8 h 51	20	Good coverage
December	5.6°C	1.2°C	74 mm	12.9	7 h 57	5	Good coverage

Records at AACHEN, 1891–2011
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.2°C5 Jan 1999	-20.4°C11 Jan 1945	37 mm11 Jan 1993	141 mm1948 · driest 4 mm in 1997	106
February	20.5°C29 Feb 1960	-20.2°C7 Feb 1895	44 mm6 Feb 1984	171 mm1946 · driest 4 mm in 1959	106
March	24.4°C23 Mar 1945	-11.9°C7 Mar 1895	32 mm16 Mar 1948	155 mm1988 · driest 0 mm in 1945	106
April	30.0°C21 Apr 1968	-4.8°C6 Apr 1911	47 mm6 Apr 1947	154 mm1935 · driest 0 mm in 2007	105
May	34.2°C28 May 1892	-1.3°C8 May 1941	43 mm9 May 1906	166 mm1984 · driest 5 mm in 1939	105
June	36.6°C27 Jun 1947	1.8°C2 Jun 1962	68 mm7 Jun 1905	180 mm1961 · driest 16 mm in 1962	105
July	37.0°C28 Jul 1911	5.8°C1 Jul 1984	56 mm12 Jul 1930	217 mm2000 · driest 15 mm in 2006	105
August	37.2°C23 Aug 1944	3.4°C26 Aug 1904	63 mm26 Aug 1971	177 mm1969 · driest 8 mm in 1899	105
September	34.3°C8 Sep 1911	0.0°C11 Sep 1944	67 mm26 Sep 1956	197 mm1984 · driest 6 mm in 1959	105
October	26.9°C13 Oct 2001	-5.7°C27 Oct 1950	64 mm7 Oct 1982	153 mm1982 · driest 4 mm in 1969	105
November	22.1°C4 Nov 1994	-8.9°C21 Nov 1902	43 mm7 Nov 1948	163 mm1952 · driest 6 mm in 1953	105
December	17.6°C4 Dec 1953	-16.5°C30 Dec 1950	41 mm29 Dec 1990	167 mm1966 · driest 9 mm in 1933	105

Typical days per month at AACHEN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	13	2
February	0	0	11	2
March	0	0	6	1
April	1	0	2	2
May	3	<1	0	2
June	7	1	0	2
July	12	3	0	2
August	10	3	0	3
September	3	<1	0	2
October	<1	0	<1	2
November	0	0	5	2
December	0	0	12	2

How often, not how much — every day in AACHEN’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%	40%	5%	53%	1.1–7.6°C
February	<1%	38%	5%	50%	2.6–9.1°C
March	1%	36%	5%	48%	6.7–12.3°C
April	9%	37%	5%	49%	10.6–16.2°C
May	24%	36%	6%	50%	15.2–20.0°C
June	39%	36%	8%	49%	18.7–22.7°C
July	49%	38%	8%	51%	19.7–24.9°C
August	49%	35%	7%	45%	19.9–25.0°C
September	30%	33%	6%	43%	16.8–21.7°C
October	9%	33%	6%	42%	12.0–16.5°C
November	<1%	39%	6%	54%	6.7–11.2°C
December	0%	40%	5%	54%	2.6–7.9°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.

1891Each stripe is one year’s mean temperature against the 105-year average. Warmest: 2000. Coolest: 1956.2010

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2754652
NOAA station: GME00102316 · AACHEN
Station distance: 13.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 50.88°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 AACHEN is what differs

Aachen→Stolberg→Eschweiler→Verviers→Kerkrade→Herzogenrath→

Or put two places side by side: Heerlen vs Aachen

Best time to visitHeerlen.

July

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Heerlen.

The whole year,
without the guesswork.

Nearby, measured,
and named.