EuroVelo 1 - Atlantic Coast Route - part France: which way and when to ride
The best month for EuroVelo 1 - Atlantic Coast Route - part France is September: 79% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 2.0 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 | 34% | 25% | 85 | 10 °C | 0% | 49% | 9.0 † |
| February | 48% | 23% | 68 | 11 °C | 0% | 35% | 10.3 † |
| March | 63% | 26% | 69 | 13 °C | 0% | 17% | 11.8 |
| April | 75% | 23% | 59 | 16 °C | 0% | 3% | 13.5 |
| May | 75% | 24% | 67 | 19 °C | 1% | 0% | 15.0 |
| June | 74% | 21% | 63 | 22 °C | 5% | 0% | 15.8 |
| July | 76% | 14% | 41 | 24 °C | 9% | 0% | 15.4 |
| August | 77% | 14% | 45 | 24 °C | 9% | 0% | 14.2 |
| September | 79% | 18% | 52 | 22 °C | 4% | 0% | 12.5 |
| October | 77% | 22% | 78 | 18 °C | 0% | 1% | 10.8 † |
| November | 61% | 28% | 95 | 14 °C | 0% | 14% | 9.3 † |
| December | 41% | 27% | 89 | 11 °C | 0% | 38% | 8.6 † |
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 Roscoff → Irun, km/h | Headwind > 15 km/h, Roscoff → Irun | Headwind > 15 km/h, Irun → Roscoff | Better way |
|---|---|---|---|---|
| January | 0.0 | 11% | 10% | either |
| February | +0.4 | 11% | 11% | either |
| March | +0.9 | 10% | 12% | either |
| April | +1.4 | 7% | 9% | either |
| May | +2.4 | 6% | 10% | Roscoff → Irun |
| June | +2.5 | 4% | 7% | Roscoff → Irun |
| July | +3.2 | 4% | 9% | Roscoff → Irun |
| August | +3.1 | 4% | 8% | Roscoff → Irun |
| September | +2.0 | 5% | 8% | either |
| October | −0.6 | 10% | 6% | either |
| November | −0.3 | 11% | 10% | either |
| December | −0.9 | 11% | 9% | either |
Stages
The route is split into 10 stages of about 100–150 km between towns; each stage has its own page.
| Stage | km | Best month | Tailwind Roscoff → Irun in September, km/h |
|---|---|---|---|
| 1. Roscoff → Rostrenen | 111 | August | +2.2 |
| 2. Rostrenen → Malestroit | 125 | September | +2.3 |
| 3. Malestroit → Nantes | 139 | September | +1.9 |
| 4. Nantes → Pornic | 108 | September | −1.3 |
| 5. Pornic → Olonne-sur-Mer | 124 | September | +2.1 |
| 6. Olonne-sur-Mer → La Rochelle | 125 | July | +3.1 |
| 7. La Rochelle → Royan | 135 | October | +2.2 |
| 8. Royan → Andernos-les-Bains | 133 | October | +2.6 |
| 9. Andernos-les-Bains → Mimizan | 117 | October | +2.6 |
| 10. Mimizan → Irun | 163 | July | +1.7 |
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.