EuroVelo 13 - Iron Curtain Trail - part Latvia, stage 1: Ainaži → Riga
On stage 1 (Ainaži → Riga, 143 km) the best month is September: 74% of days were dry with highs of 10–30 °C, and riding Riga → Ainaži meant an average tailwind of 3.0 km/h (ERA5 2006–2025, 9:00–18:00).
← EuroVelo 13 - Iron Curtain Trail - part Latvia (Whole route)
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 0% | 23% | 56 | -1 °C | 0% | 100% | 7.3 † |
| February | 0% | 20% | 41 | -1 °C | 0% | 100% | 9.3 † |
| March | 9% | 20% | 40 | 4 °C | 0% | 90% | 11.6 |
| April | 44% | 21% | 42 | 10 °C | 0% | 51% | 14.2 |
| May | 70% | 22% | 51 | 16 °C | 0% | 11% | 16.5 |
| June | 74% | 25% | 71 | 20 °C | 2% | 0% | 17.9 |
| July | 63% | 33% | 88 | 23 °C | 4% | 0% | 17.4 |
| August | 67% | 31% | 94 | 22 °C | 2% | 0% | 15.2 |
| September | 74% | 24% | 62 | 17 °C | 0% | 2% | 12.7 |
| October | 41% | 26% | 72 | 10 °C | 0% | 43% | 10.2 † |
| November | 5% | 22% | 57 | 5 °C | 0% | 93% | 7.9 † |
| December | 0% | 23% | 54 | 2 °C | 0% | 100% | 6.7 † |
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 Ainaži → Riga, km/h | Headwind > 15 km/h, Ainaži → Riga | Headwind > 15 km/h, Riga → Ainaži | Better way |
|---|---|---|---|---|
| January | −5.7 | 26% | 6% | Riga → Ainaži |
| February | −4.6 | 21% | 6% | Riga → Ainaži |
| March | −2.5 | 16% | 8% | Riga → Ainaži |
| April | +0.2 | 11% | 11% | either |
| May | +0.6 | 8% | 8% | either |
| June | 0.0 | 9% | 8% | either |
| July | −0.4 | 7% | 6% | either |
| August | −2.7 | 13% | 4% | Riga → Ainaži |
| September | −3.0 | 16% | 6% | Riga → Ainaži |
| October | −5.1 | 24% | 7% | Riga → Ainaži |
| November | −6.7 | 26% | 4% | Riga → Ainaži |
| December | −7.2 | 31% | 6% | Riga → Ainaži |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–27 | S | −3.0 |
| 27–52 | S | −3.0 |
| 52–77 | SE | −1.3 |
| 77–103 | SW | −4.1 |
| 103–129 | SW | −4.0 |
| 129–143 | S | −2.5 |
Other stages
- Ainaži → Riga 143 km
- Riga → near Roja 115 km
- near Roja → Ventspils 120 km
- Ventspils → Liepāja 128 km
- Liepāja → near Šventoji 61 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.