Záhorská cyklomagistrála: which way and when to ride
The best month for Záhorská cyklomagistrála is September: 79% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.2 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 | 5% | 16% | 40 | 3 °C | 0% | 94% | 8.7 † |
| February | 16% | 16% | 36 | 5 °C | 0% | 81% | 10.1 † |
| March | 47% | 15% | 39 | 11 °C | 0% | 47% | 11.7 |
| April | 72% | 19% | 43 | 16 °C | 0% | 15% | 13.6 |
| May | 71% | 28% | 76 | 20 °C | 1% | 1% | 15.2 |
| June | 65% | 24% | 81 | 25 °C | 13% | 0% | 16.1 |
| July | 55% | 23% | 72 | 27 °C | 27% | 0% | 15.7 |
| August | 57% | 22% | 78 | 26 °C | 24% | 0% | 14.3 |
| September | 79% | 19% | 81 | 21 °C | 3% | 0% | 12.5 |
| October | 76% | 15% | 47 | 15 °C | 0% | 12% | 10.7 † |
| November | 33% | 16% | 44 | 9 °C | 0% | 62% | 9.1 † |
| December | 5% | 16% | 40 | 4 °C | 0% | 94% | 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 Devín → Senica, km/h | Headwind > 15 km/h, Devín → Senica | Headwind > 15 km/h, Senica → Devín | Better way |
|---|---|---|---|---|
| January | +0.3 | 8% | 5% | either |
| February | −0.4 | 11% | 8% | either |
| March | −0.4 | 12% | 10% | either |
| April | −0.9 | 13% | 10% | either |
| May | −1.1 | 14% | 8% | either |
| June | −1.1 | 10% | 7% | either |
| July | −0.6 | 7% | 6% | either |
| August | +0.2 | 6% | 5% | either |
| September | −0.2 | 8% | 7% | either |
| October | +0.7 | 9% | 8% | either |
| November | +1.5 | 8% | 8% | either |
| December | +0.8 | 7% | 6% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | N | −0.8 |
| 25–51 | N | −0.6 |
| 51–76 | NE | −0.1 |
| 76–101 | N | −0.6 |
| 101–127 | SE | +0.8 |
| 127–131 | S | +0.8 |
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.