Loire à Vélo, stage 4: Saumur → Saint-Brevin-les-Pins
On stage 4 (Saumur → Saint-Brevin-les-Pins, 200 km) the best month is September: 80% of days were dry with highs of 10–30 °C, and riding Saint-Brevin-les-Pins → Saumur meant an average tailwind of 2.4 km/h (ERA5 2006–2025, 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 | 29% | 22% | 67 | 9 °C | 0% | 57% | 8.9 † |
| February | 44% | 21% | 55 | 10 °C | 0% | 41% | 10.2 † |
| March | 60% | 26% | 59 | 13 °C | 0% | 20% | 11.8 |
| April | 76% | 22% | 50 | 16 °C | 0% | 2% | 13.6 |
| May | 75% | 25% | 60 | 19 °C | 1% | 0% | 15.1 |
| June | 74% | 21% | 55 | 23 °C | 6% | 0% | 15.9 |
| July | 74% | 16% | 41 | 25 °C | 12% | 0% | 15.6 |
| August | 74% | 15% | 41 | 24 °C | 11% | 0% | 14.2 |
| September | 80% | 17% | 46 | 22 °C | 4% | 0% | 12.5 |
| October | 77% | 22% | 74 | 18 °C | 0% | 1% | 10.8 † |
| November | 61% | 23% | 70 | 13 °C | 0% | 19% | 9.2 † |
| December | 34% | 23% | 73 | 9 °C | 0% | 48% | 8.5 † |
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 Saumur → Saint-Brevin-les-Pins, km/h | Headwind > 15 km/h, Saumur → Saint-Brevin-les-Pins | Headwind > 15 km/h, Saint-Brevin-les-Pins → Saumur | Better way |
|---|---|---|---|---|
| January | −4.1 | 21% | 5% | Saint-Brevin-les-Pins → Saumur |
| February | −3.7 | 21% | 7% | Saint-Brevin-les-Pins → Saumur |
| March | −2.5 | 20% | 9% | Saint-Brevin-les-Pins → Saumur |
| April | −0.8 | 13% | 9% | either |
| May | −3.1 | 18% | 7% | Saint-Brevin-les-Pins → Saumur |
| June | −3.3 | 16% | 5% | Saint-Brevin-les-Pins → Saumur |
| July | −6.4 | 23% | 4% | Saint-Brevin-les-Pins → Saumur |
| August | −5.8 | 19% | 3% | Saint-Brevin-les-Pins → Saumur |
| September | −2.4 | 14% | 7% | Saint-Brevin-les-Pins → Saumur |
| October | −1.7 | 14% | 6% | either |
| November | −3.7 | 18% | 4% | Saint-Brevin-les-Pins → Saumur |
| December | −4.0 | 20% | 6% | Saint-Brevin-les-Pins → Saumur |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 388–413 | NW | −2.0 |
| 413–438 | W | −2.2 |
| 438–464 | W | −2.0 |
| 464–489 | W | −2.4 |
| 489–514 | SW | −1.9 |
| 514–539 | SW | −1.8 |
| 539–565 | W | −3.2 |
| 565–588 | W | −3.5 |
Other stages
- Cuffy → Gien 106 km
- Gien → Blois 134 km
- Blois → Saumur 149 km
- Saumur → Saint-Brevin-les-Pins 200 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.