EuroVelo 1 - Atlantic Coast Route - part France, stage 3: Malestroit → Nantes
On stage 3 (Malestroit → Nantes, 139 km) the best month is September: 80% of days were dry with highs of 10–30 °C; the wind barely favours either direction (1.9 km/h on average; 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 | 30% | 22% | 69 | 9 °C | 0% | 55% | 8.8 † |
| February | 46% | 20% | 57 | 10 °C | 0% | 40% | 10.2 † |
| March | 62% | 25% | 58 | 13 °C | 0% | 19% | 11.8 |
| April | 76% | 23% | 53 | 16 °C | 0% | 2% | 13.6 |
| May | 75% | 25% | 58 | 19 °C | 0% | 0% | 15.1 |
| June | 75% | 21% | 55 | 22 °C | 5% | 0% | 15.9 |
| July | 75% | 17% | 46 | 24 °C | 9% | 0% | 15.6 |
| August | 76% | 16% | 43 | 24 °C | 8% | 0% | 14.2 |
| September | 80% | 18% | 43 | 22 °C | 2% | 0% | 12.5 |
| October | 77% | 22% | 74 | 17 °C | 0% | 1% | 10.8 † |
| November | 62% | 23% | 73 | 13 °C | 0% | 18% | 9.2 † |
| December | 36% | 24% | 76 | 10 °C | 0% | 45% | 8.4 † |
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 Malestroit → Nantes, km/h | Headwind > 15 km/h, Malestroit → Nantes | Headwind > 15 km/h, Nantes → Malestroit | Better way |
|---|---|---|---|---|
| January | +1.2 | 6% | 9% | either |
| February | +1.3 | 7% | 12% | either |
| March | +1.4 | 7% | 12% | either |
| April | +0.8 | 5% | 7% | either |
| May | +2.3 | 4% | 9% | Malestroit → Nantes |
| June | +2.2 | 3% | 6% | Malestroit → Nantes |
| July | +3.5 | 2% | 8% | Malestroit → Nantes |
| August | +3.5 | 2% | 8% | Malestroit → Nantes |
| September | +1.9 | 3% | 7% | either |
| October | −0.4 | 7% | 6% | either |
| November | +0.8 | 7% | 10% | either |
| December | +0.4 | 7% | 10% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 238–263 | SE | +2.4 |
| 263–288 | SE | +1.5 |
| 288–313 | SE | +2.5 |
| 313–339 | E | +2.6 |
| 339–364 | SE | +1.5 |
| 364–376 | S | +0.3 |
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.