Greenway Prague - Vienna: which way and when to ride
The best month for Greenway Prague - Vienna is September: 78% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.8 km/h along the route (ERA5 2006–2025, daytime 9:00–18:00).
Also passes through Austria
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 3% | 18% | 42 | 2 °C | 0% | 96% | 8.6 † |
| February | 11% | 15% | 32 | 4 °C | 0% | 87% | 10.1 † |
| March | 37% | 19% | 40 | 9 °C | 0% | 58% | 11.7 |
| April | 66% | 21% | 42 | 15 °C | 0% | 23% | 13.7 |
| May | 69% | 30% | 77 | 18 °C | 0% | 4% | 15.3 |
| June | 67% | 28% | 85 | 23 °C | 6% | 0% | 16.2 |
| July | 60% | 28% | 81 | 25 °C | 14% | 0% | 15.8 |
| August | 65% | 24% | 81 | 24 °C | 13% | 0% | 14.4 |
| September | 78% | 20% | 69 | 19 °C | 1% | 2% | 12.5 |
| October | 66% | 17% | 44 | 13 °C | 0% | 23% | 10.7 † |
| November | 23% | 15% | 40 | 7 °C | 0% | 74% | 9.0 † |
| December | 4% | 16% | 40 | 3 °C | 0% | 96% | 8.2 † |
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 Prague → Valtice, km/h | Headwind > 15 km/h, Prague → Valtice | Headwind > 15 km/h, Valtice → Prague | Better way |
|---|---|---|---|---|
| January | +1.9 | 5% | 13% | either |
| February | +1.9 | 5% | 13% | either |
| March | +2.1 | 7% | 13% | Prague → Valtice |
| April | +1.6 | 6% | 11% | either |
| May | +1.1 | 7% | 9% | either |
| June | +2.3 | 2% | 8% | Prague → Valtice |
| July | +3.6 | 1% | 9% | Prague → Valtice |
| August | +1.5 | 2% | 5% | either |
| September | +0.8 | 4% | 7% | either |
| October | −0.1 | 6% | 7% | either |
| November | −0.6 | 7% | 8% | either |
| December | +0.7 | 5% | 10% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | E | +2.2 |
| 25–51 | S | +0.7 |
| 51–77 | S | −0.6 |
| 77–102 | SE | +1.2 |
| 102–127 | S | +0.5 |
| 127–152 | SE | +1.3 |
| 152–178 | SE | +1.2 |
| 178–203 | SE | +1.2 |
| 203–228 | E | +1.4 |
| 228–253 | SE | +1.3 |
| 253–278 | E | +0.6 |
| 278–304 | SE | +0.9 |
| 304–331 | E | +0.3 |
| 331–356 | E | −0.1 |
| 356–373 | SE | +0.6 |
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.