EuroVelo 9 - Baltic-Adriatic - Greater Poland voivodeship: which way and when to ride
The best month for EuroVelo 9 - Baltic-Adriatic - Greater Poland voivodeship is September: 81% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 1.3 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 | 3% | 21% | 50 | 2 °C | 0% | 95% | 8.2 † |
| February | 7% | 18% | 38 | 4 °C | 0% | 91% | 9.8 † |
| March | 33% | 21% | 40 | 9 °C | 0% | 61% | 11.7 |
| April | 67% | 18% | 33 | 14 °C | 0% | 23% | 13.8 |
| May | 75% | 24% | 57 | 19 °C | 0% | 2% | 15.7 |
| June | 69% | 25% | 62 | 23 °C | 8% | 0% | 16.7 |
| July | 62% | 26% | 84 | 25 °C | 14% | 0% | 16.3 |
| August | 65% | 23% | 76 | 24 °C | 13% | 0% | 14.7 |
| September | 81% | 17% | 47 | 20 °C | 2% | 0% | 12.6 |
| October | 68% | 19% | 48 | 14 °C | 0% | 19% | 10.5 † |
| November | 26% | 18% | 43 | 8 °C | 0% | 69% | 8.7 † |
| December | 5% | 17% | 40 | 4 °C | 0% | 93% | 7.7 † |
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 near Trzemeszno → near Pakosław, km/h | Headwind > 15 km/h, near Trzemeszno → near Pakosław | Headwind > 15 km/h, near Pakosław → near Trzemeszno | Better way |
|---|---|---|---|---|
| January | −3.8 | 16% | 5% | near Pakosław → near Trzemeszno |
| February | −2.5 | 14% | 6% | near Pakosław → near Trzemeszno |
| March | −1.6 | 12% | 6% | either |
| April | +0.2 | 9% | 8% | either |
| May | +0.4 | 8% | 8% | either |
| June | 0.0 | 8% | 6% | either |
| July | −0.8 | 8% | 5% | either |
| August | −1.7 | 8% | 3% | either |
| September | −1.3 | 9% | 5% | either |
| October | −3.4 | 12% | 5% | near Pakosław → near Trzemeszno |
| November | −4.3 | 14% | 3% | near Pakosław → near Trzemeszno |
| December | −5.1 | 17% | 3% | near Pakosław → near Trzemeszno |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | SW | −2.8 |
| 25–52 | W | −3.1 |
| 52–77 | SW | −3.1 |
| 77–103 | SW | −2.9 |
| 103–128 | S | −1.6 |
| 128–153 | S | +0.2 |
| 153–179 | SE | +1.2 |
| 179–204 | SE | +0.8 |
| 204–230 | S | −0.2 |
| 230–238 | SW | −2.0 |
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.