Véloroute La Seine à Vélo (Tronçon Seine Maritime): which way and when to ride
The best month for Véloroute La Seine à Vélo (Tronçon Seine Maritime) is September: 77% of days were dry with highs of 10–30 °C. In September, riding Le Havre → Elbeuf meant an average tailwind of 2.7 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 | 14% | 26% | 72 | 7 °C | 0% | 76% | 8.6 † |
| February | 24% | 27% | 61 | 8 °C | 0% | 64% | 10.1 † |
| March | 46% | 30% | 65 | 11 °C | 0% | 38% | 11.7 |
| April | 68% | 26% | 52 | 15 °C | 0% | 10% | 13.7 |
| May | 71% | 29% | 68 | 17 °C | 0% | 1% | 15.3 |
| June | 72% | 26% | 65 | 21 °C | 2% | 0% | 16.2 |
| July | 71% | 24% | 63 | 23 °C | 5% | 0% | 15.9 |
| August | 72% | 24% | 66 | 22 °C | 4% | 0% | 14.4 |
| September | 77% | 22% | 54 | 20 °C | 1% | 0% | 12.5 |
| October | 72% | 26% | 80 | 16 °C | 0% | 3% | 10.7 † |
| November | 46% | 28% | 80 | 11 °C | 0% | 35% | 9.0 † |
| December | 20% | 28% | 86 | 8 °C | 0% | 66% | 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 Elbeuf → Le Havre, km/h | Headwind > 15 km/h, Elbeuf → Le Havre | Headwind > 15 km/h, Le Havre → Elbeuf | Better way |
|---|---|---|---|---|
| January | −3.1 | 18% | 7% | Le Havre → Elbeuf |
| February | −2.7 | 19% | 9% | Le Havre → Elbeuf |
| March | −2.1 | 17% | 9% | Le Havre → Elbeuf |
| April | −1.0 | 11% | 8% | either |
| May | −3.1 | 16% | 6% | Le Havre → Elbeuf |
| June | −3.0 | 12% | 4% | Le Havre → Elbeuf |
| July | −5.3 | 18% | 2% | Le Havre → Elbeuf |
| August | −5.3 | 17% | 2% | Le Havre → Elbeuf |
| September | −2.7 | 13% | 5% | Le Havre → Elbeuf |
| October | −1.3 | 14% | 8% | either |
| November | −1.9 | 15% | 8% | either |
| December | −2.7 | 17% | 7% | Le Havre → Elbeuf |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | N | +0.5 |
| 25–51 | SW | −3.2 |
| 51–76 | NW | −2.6 |
| 76–102 | NW | −2.0 |
| 102–127 | W | −4.0 |
| 127–152 | W | −4.0 |
| 152–165 | W | −4.5 |
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.