EuroVelo 1 - Atlantic Coast Route - part France, stage 1: Roscoff → Rostrenen
On stage 1 (Roscoff → Rostrenen, 111 km) the best month is August: 78% of days were dry with highs of 10–30 °C, and riding Roscoff → Rostrenen meant an average tailwind of 4.2 km/h (ERA5 2006–2025, 9:00–18:00).
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Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 23% | 30% | 87 | 9 °C | 0% | 62% | 8.7 † |
| February | 34% | 31% | 79 | 9 °C | 0% | 51% | 10.1 † |
| March | 47% | 32% | 74 | 11 °C | 0% | 33% | 11.7 |
| April | 66% | 29% | 66 | 14 °C | 0% | 8% | 13.6 |
| May | 71% | 29% | 72 | 17 °C | 0% | 1% | 15.2 |
| June | 71% | 27% | 68 | 19 °C | 2% | 0% | 16.1 |
| July | 73% | 26% | 50 | 21 °C | 2% | 0% | 15.7 |
| August | 78% | 21% | 54 | 21 °C | 1% | 0% | 14.3 |
| September | 78% | 22% | 52 | 19 °C | 0% | 0% | 12.5 |
| October | 73% | 26% | 84 | 16 °C | 0% | 2% | 10.7 † |
| November | 52% | 34% | 94 | 12 °C | 0% | 20% | 9.1 † |
| December | 32% | 31% | 98 | 10 °C | 0% | 48% | 8.3 † |
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 → Rostrenen, km/h | Headwind > 15 km/h, Roscoff → Rostrenen | Headwind > 15 km/h, Rostrenen → Roscoff | Better way |
|---|---|---|---|---|
| January | +1.4 | 8% | 12% | either |
| February | +1.4 | 8% | 14% | either |
| March | +1.5 | 9% | 14% | either |
| April | +1.4 | 6% | 9% | either |
| May | +2.9 | 4% | 10% | Roscoff → Rostrenen |
| June | +3.2 | 3% | 7% | Roscoff → Rostrenen |
| July | +4.1 | 2% | 9% | Roscoff → Rostrenen |
| August | +4.2 | 3% | 10% | Roscoff → Rostrenen |
| September | +2.2 | 5% | 10% | Roscoff → Rostrenen |
| October | −0.7 | 10% | 7% | either |
| November | +1.4 | 9% | 13% | either |
| December | +0.3 | 8% | 12% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in August, km/h |
|---|---|---|
| 0–25 | SE | +3.4 |
| 25–43 | SE | +4.6 |
| 43–68 | SE | +3.7 |
| 68–93 | SE | +4.4 |
| 93–111 | E | +5.5 |
Other stages
- Roscoff → Rostrenen 111 km
- Rostrenen → Malestroit 125 km
- Malestroit → Nantes 139 km
- Nantes → Pornic 108 km
- Pornic → Olonne-sur-Mer 124 km
- Olonne-sur-Mer → La Rochelle 125 km
- La Rochelle → Royan 135 km
- Royan → Andernos-les-Bains 133 km
- Andernos-les-Bains → Mimizan 117 km
- Mimizan → Irun 163 km
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.