Euroroute R1 - part Latvia, stage 4: Cēsis → Valga
On stage 4 (Cēsis → Valga, 83 km) the best month is September: 72% of days were dry with highs of 10–30 °C, and riding Cēsis → Valga meant an average tailwind of 4.6 km/h (ERA5 2006–2025, 9:00–18:00).
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Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 0% | 22% | 53 | -2 °C | 0% | 100% | 7.2 † |
| February | 0% | 19% | 39 | -1 °C | 0% | 100% | 9.3 † |
| March | 9% | 21% | 40 | 4 °C | 0% | 90% | 11.6 |
| April | 45% | 23% | 44 | 11 °C | 0% | 51% | 14.2 |
| May | 68% | 25% | 55 | 16 °C | 0% | 11% | 16.6 |
| June | 69% | 30% | 77 | 20 °C | 1% | 0% | 18.0 |
| July | 64% | 34% | 85 | 22 °C | 3% | 0% | 17.4 |
| August | 66% | 32% | 88 | 21 °C | 2% | 0% | 15.3 |
| September | 72% | 25% | 53 | 17 °C | 0% | 4% | 12.7 |
| October | 35% | 27% | 67 | 10 °C | 0% | 51% | 10.2 † |
| November | 4% | 21% | 55 | 4 °C | 0% | 95% | 7.8 † |
| December | 0% | 23% | 50 | 1 °C | 0% | 100% | 6.6 † |
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 Cēsis → Valga, km/h | Headwind > 15 km/h, Cēsis → Valga | Headwind > 15 km/h, Valga → Cēsis | Better way |
|---|---|---|---|---|
| January | +6.4 | 3% | 27% | Cēsis → Valga |
| February | +5.1 | 3% | 22% | Cēsis → Valga |
| March | +4.6 | 6% | 20% | Cēsis → Valga |
| April | +2.4 | 8% | 16% | Cēsis → Valga |
| May | +1.5 | 6% | 11% | either |
| June | +3.5 | 5% | 14% | Cēsis → Valga |
| July | +3.0 | 4% | 11% | Cēsis → Valga |
| August | +4.4 | 3% | 16% | Cēsis → Valga |
| September | +4.6 | 4% | 19% | Cēsis → Valga |
| October | +6.6 | 4% | 26% | Cēsis → Valga |
| November | +7.1 | 3% | 25% | Cēsis → Valga |
| December | +8.0 | 3% | 30% | Cēsis → Valga |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 404–429 | NE | +4.3 |
| 429–456 | NE | +4.7 |
| 456–481 | NE | +4.6 |
| 481–487 | NE | +4.6 |
Other stages
- near Šventoji → Kuldīga 140 km
- Kuldīga → Jūrmala 135 km
- Jūrmala → Cēsis 133 km
- Cēsis → Valga 83 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.