EuroVelo 1 - Atlantic Coast Route - part France, stage 5: Pornic → Olonne-sur-Mer
On stage 5 (Pornic → Olonne-sur-Mer, 124 km) the best month is September: 82% of days were dry with highs of 10–30 °C, and riding Pornic → Olonne-sur-Mer meant an average tailwind of 2.1 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 | 32% | 23% | 75 | 9 °C | 0% | 51% | 8.9 † |
| February | 47% | 19% | 57 | 10 °C | 0% | 38% | 10.2 † |
| March | 64% | 23% | 59 | 13 °C | 0% | 17% | 11.8 |
| April | 82% | 17% | 47 | 16 °C | 0% | 2% | 13.5 |
| May | 79% | 21% | 54 | 18 °C | 0% | 0% | 15.0 |
| June | 78% | 19% | 49 | 22 °C | 3% | 0% | 15.8 |
| July | 79% | 14% | 41 | 23 °C | 7% | 0% | 15.5 |
| August | 80% | 13% | 41 | 23 °C | 7% | 0% | 14.2 |
| September | 82% | 16% | 48 | 21 °C | 2% | 0% | 12.5 |
| October | 79% | 20% | 76 | 18 °C | 0% | 1% | 10.8 † |
| November | 62% | 26% | 84 | 13 °C | 0% | 14% | 9.3 † |
| December | 40% | 26% | 81 | 10 °C | 0% | 39% | 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 Pornic → Olonne-sur-Mer, km/h | Headwind > 15 km/h, Pornic → Olonne-sur-Mer | Headwind > 15 km/h, Olonne-sur-Mer → Pornic | Better way |
|---|---|---|---|---|
| January | −0.2 | 14% | 12% | either |
| February | +0.1 | 14% | 14% | either |
| March | +0.9 | 14% | 15% | either |
| April | +1.6 | 9% | 12% | either |
| May | +2.4 | 8% | 13% | Pornic → Olonne-sur-Mer |
| June | +2.4 | 6% | 10% | Pornic → Olonne-sur-Mer |
| July | +2.3 | 7% | 11% | Pornic → Olonne-sur-Mer |
| August | +2.5 | 6% | 11% | Pornic → Olonne-sur-Mer |
| September | +2.1 | 8% | 11% | Pornic → Olonne-sur-Mer |
| October | −1.3 | 14% | 8% | either |
| November | −0.5 | 16% | 13% | either |
| December | −1.0 | 15% | 12% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 484–509 | S | +2.6 |
| 509–534 | S | +1.4 |
| 534–559 | SW | −1.3 |
| 559–585 | SE | +4.7 |
| 585–608 | SE | +3.3 |
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.