EuroVelo 9 - Baltic-Adriatic - Pomeranian voivodeship - Vistula east bank: which way and when to ride
The best month for EuroVelo 9 - Baltic-Adriatic - Pomeranian voivodeship - Vistula east bank is September: 80% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 1.8 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 | 1% | 20% | 46 | 1 °C | 0% | 98% | 7.9 † |
| February | 2% | 16% | 35 | 3 °C | 0% | 97% | 9.7 † |
| March | 24% | 19% | 33 | 7 °C | 0% | 72% | 11.7 |
| April | 57% | 19% | 35 | 13 °C | 0% | 33% | 13.9 |
| May | 72% | 26% | 61 | 17 °C | 0% | 4% | 15.9 |
| June | 71% | 27% | 71 | 21 °C | 2% | 0% | 17.1 |
| July | 64% | 33% | 98 | 23 °C | 4% | 0% | 16.6 |
| August | 70% | 27% | 72 | 23 °C | 4% | 0% | 14.8 |
| September | 80% | 19% | 49 | 19 °C | 1% | 0% | 12.6 |
| October | 64% | 19% | 49 | 13 °C | 0% | 22% | 10.4 † |
| November | 19% | 19% | 46 | 7 °C | 0% | 76% | 8.4 † |
| December | 2% | 18% | 43 | 3 °C | 0% | 96% | 7.4 † |
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 Wyspa Sobieszewska → near Nowe, km/h | Headwind > 15 km/h, Wyspa Sobieszewska → near Nowe | Headwind > 15 km/h, near Nowe → Wyspa Sobieszewska | Better way |
|---|---|---|---|---|
| January | −5.6 | 23% | 5% | near Nowe → Wyspa Sobieszewska |
| February | −3.8 | 17% | 6% | near Nowe → Wyspa Sobieszewska |
| March | −1.3 | 13% | 9% | either |
| April | +2.4 | 9% | 18% | Wyspa Sobieszewska → near Nowe |
| May | +2.3 | 7% | 15% | Wyspa Sobieszewska → near Nowe |
| June | +1.7 | 7% | 12% | either |
| July | +1.1 | 6% | 9% | either |
| August | −1.4 | 9% | 6% | either |
| September | −1.8 | 12% | 7% | either |
| October | −5.3 | 21% | 5% | near Nowe → Wyspa Sobieszewska |
| November | −7.3 | 22% | 3% | near Nowe → Wyspa Sobieszewska |
| December | −7.6 | 27% | 3% | near Nowe → Wyspa Sobieszewska |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | S | −1.5 |
| 25–50 | S | −1.9 |
| 50–76 | S | −1.5 |
| 76–101 | S | −2.3 |
| 101–110 | S | −1.9 |
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.