Véloroute La Seine à Vélo (branche alternative vers Honfleur): which way and when to ride
The best month for Véloroute La Seine à Vélo (branche alternative vers Honfleur) is September: 76% of days were dry with highs of 10–30 °C. In September, riding Deauville → Jumièges meant an average tailwind of 3.3 km/h (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 | 15% | 27% | 75 | 7 °C | 0% | 73% | 8.6 † |
| February | 26% | 27% | 63 | 9 °C | 0% | 62% | 10.1 † |
| March | 46% | 31% | 66 | 11 °C | 0% | 37% | 11.7 |
| April | 68% | 25% | 51 | 14 °C | 0% | 10% | 13.7 |
| May | 71% | 28% | 67 | 17 °C | 0% | 1% | 15.3 |
| June | 72% | 26% | 67 | 20 °C | 2% | 0% | 16.2 |
| July | 71% | 25% | 64 | 22 °C | 4% | 0% | 15.9 |
| August | 73% | 24% | 66 | 22 °C | 4% | 0% | 14.4 |
| September | 76% | 23% | 58 | 20 °C | 1% | 0% | 12.5 |
| October | 72% | 26% | 80 | 16 °C | 0% | 3% | 10.7 † |
| November | 50% | 29% | 85 | 11 °C | 0% | 31% | 9.0 † |
| December | 22% | 29% | 90 | 8 °C | 0% | 62% | 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 Jumièges → Deauville, km/h | Headwind > 15 km/h, Jumièges → Deauville | Headwind > 15 km/h, Deauville → Jumièges | Better way |
|---|---|---|---|---|
| January | −5.2 | 23% | 5% | Deauville → Jumièges |
| February | −4.3 | 24% | 8% | Deauville → Jumièges |
| March | −2.8 | 20% | 9% | Deauville → Jumièges |
| April | −0.7 | 13% | 8% | either |
| May | −2.9 | 17% | 6% | Deauville → Jumièges |
| June | −2.9 | 14% | 5% | Deauville → Jumièges |
| July | −6.0 | 21% | 2% | Deauville → Jumièges |
| August | −6.3 | 20% | 2% | Deauville → Jumièges |
| September | −3.3 | 16% | 5% | Deauville → Jumièges |
| October | −3.2 | 18% | 6% | Deauville → Jumièges |
| November | −4.2 | 21% | 5% | Deauville → Jumièges |
| December | −5.3 | 23% | 5% | Deauville → Jumièges |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–26 | W | −3.5 |
| 26–51 | W | −3.8 |
| 51–76 | W | −4.6 |
| 76–101 | SW | −2.0 |
| 101–118 | NW | −2.5 |
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.