Vennbahn (Radweg): which way and when to ride

The best month for Vennbahn (Radweg) is September: 73% of days were dry with highs of 10–30 °C. In September, riding Troisvierges → Aachen meant an average tailwind of 2.1 km/h (ERA5 2006–2025, daytime 9:00–18:00).

How it works ↓

ERA5 2006–2025 · OpenStreetMap · Methodology and sources

123 kmLength

SeptemberBest months

Troisvierges → AachenBetter direction in the best month

2.1 km/hAverage tailwind in the best month

73%Dry days with 10–30 °C

June · 63%Best summer month

Start: Aachen · Finish: Troisvierges · Route geometry: OpenStreetMap / Waymarked Trails

Also passes through Germany

Weather by month

Good days

Month	Good days	Rain days ≥ 1 mm	Rain, mm	Avg high	Days ≥ 30 °C	Days < 10 °C	Daylight, h
January	3%	33%	90	3 °C	0%	95%	8.5 †
February	9%	30%	72	5 °C	0%	89%	10.0 †
March	30%	32%	77	8 °C	0%	64%	11.7
April	55%	29%	60	13 °C	0%	32%	13.7
May	61%	36%	88	16 °C	0%	7%	15.4
June	63%	36%	97	20 °C	1%	0%	16.4
July	60%	37%	97	22 °C	5%	0%	16.0
August	61%	36%	97	21 °C	4%	0%	14.5
September	73%	26%	74	18 °C	0%	2%	12.5
October	59%	26%	78	13 °C	0%	22%	10.6 †
November	20%	32%	76	8 °C	0%	72%	8.9 †
December	5%	32%	92	5 °C	0%	91%	8.0 †

Best months are all months within 3 percentage points of the best one. † less than 11 hours of daylight — long stages get tight.

Wind by month

Wind Aachen → Troisvierges, km/h

Month	Wind Aachen → Troisvierges, km/h	Headwind > 15 km/h, Aachen → Troisvierges	Headwind > 15 km/h, Troisvierges → Aachen	Better way
January	−5.5	21%	3%	Troisvierges → Aachen
February	−4.9	20%	4%	Troisvierges → Aachen
March	−2.0	14%	5%	either
April	+0.3	9%	7%	either
May	+0.3	8%	6%	either
June	+0.2	7%	4%	either
July	−1.1	8%	2%	either
August	−2.2	9%	2%	Troisvierges → Aachen
September	−2.1	10%	3%	Troisvierges → Aachen
October	−5.3	19%	2%	Troisvierges → Aachen
November	−6.6	22%	2%	Troisvierges → Aachen
December	−6.8	24%	2%	Troisvierges → Aachen

The best month on the Vennbahn between Aachen and Troisvierges is September, and the best direction is south to north, towards Aachen. September gives 73% good days, rain on just 26% of days and an average high of 18 °C, and the wind then is a tailwind if you ride towards Aachen (2.1 km/h). Summer is wetter: 63% good days in June, 60% in July, rain on 36–37% of days.

Direction: from August to February ride towards Aachen

In 7 of the 12 months, August to February, it pays to ride Troisvierges → Aachen. In November the wind is a headwind for anyone riding towards Troisvierges (6.6 km/h), and a strong headwind, more than 15 km/h, blows in 22% of hours, compared with 2% in the opposite direction. From March to July the difference is less than 2 km/h, so choose your direction by trains and accommodation. All of this is the climate of 2006–2025, not a forecast (see the climate block below).

About the route

The Vennbahn (Vennbahn-Radweg) follows a former railway through three countries, is fully tarmacked and has gentle gradients. Going by the OpenStreetMap tracks, the main line is 123 km; the route's official website puts it at 125 km in six stages.

Along the route (sections of about 25 km)

km	Heading	Tailwind in September, km/h
0–25	S	−0.5
25–50	SE	+0.1
50–75	S	−4.0
75–100	S	−1.7
100–123	SW	−4.3

OpenStreetMap · Waymarked Trails