Weser-Romantische Straße Teil 8: which way and when to ride
The best month for Weser-Romantische Straße Teil 8 is September: 76% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 1.1 km/h along the route (ERA5 2006–2025, daytime 9:00–18:00).
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 4% | 26% | 70 | 3 °C | 0% | 94% | 8.7 † |
| February | 13% | 24% | 53 | 5 °C | 0% | 85% | 10.1 † |
| March | 35% | 24% | 56 | 9 °C | 0% | 58% | 11.7 |
| April | 63% | 26% | 53 | 14 °C | 0% | 24% | 13.6 |
| May | 67% | 32% | 90 | 18 °C | 0% | 5% | 15.3 |
| June | 66% | 29% | 82 | 22 °C | 5% | 0% | 16.2 |
| July | 61% | 29% | 82 | 24 °C | 11% | 0% | 15.8 |
| August | 63% | 28% | 84 | 23 °C | 10% | 0% | 14.4 |
| September | 76% | 24% | 65 | 19 °C | 0% | 1% | 12.5 |
| October | 63% | 21% | 60 | 14 °C | 0% | 22% | 10.7 † |
| November | 21% | 22% | 65 | 7 °C | 0% | 74% | 9.1 † |
| December | 5% | 27% | 73 | 4 °C | 0% | 93% | 8.2 † |
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
| Month | Wind Rothenburg → Donauwörth, km/h | Headwind > 15 km/h, Rothenburg → Donauwörth | Headwind > 15 km/h, Donauwörth → Rothenburg | Better way |
|---|---|---|---|---|
| January | +0.1 | 2% | 4% | either |
| February | −0.1 | 2% | 4% | either |
| March | +1.2 | 2% | 5% | either |
| April | +1.9 | 1% | 4% | either |
| May | +2.4 | 1% | 5% | Rothenburg → Donauwörth |
| June | +2.6 | 0% | 4% | Rothenburg → Donauwörth |
| July | +2.9 | 0% | 3% | Rothenburg → Donauwörth |
| August | +1.6 | 0% | 2% | either |
| September | +1.1 | 0% | 2% | either |
| October | −0.5 | 1% | 3% | either |
| November | −1.2 | 1% | 3% | either |
| December | −1.0 | 2% | 2% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | SE | +1.2 |
| 25–50 | S | −0.1 |
| 50–76 | SE | +1.5 |
| 76–101 | S | +0.9 |
| 101–127 | SE | +1.7 |
| 127–133 | E | +1.8 |
How to read the numbers
Wind is the 10 m wind of a 25-km grid cell, daytime hours 9:00–18:00 local solar time; at saddle height in a sheltered valley it is weaker, on a coast or ridge stronger. A positive value is a tailwind. ERA5 slightly over-counts days with ≥ 1 mm of rain (by about 5–7 percentage points) and underestimates daily highs by 1–2 °C. Good day = less than 1 mm of rain between 9:00 and 18:00 (riding hours, local solar time) and a high between 10 and 30 °C; rain at night or in the evening does not spoil it.