Sverigeleden (18): which way and when to ride
The best month for Sverigeleden (18) is September: 80% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.4 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 | 0% | 15% | 41 | -1 °C | 0% | 100% | 6.7 † |
| February | 1% | 13% | 30 | 0 °C | 0% | 99% | 9.0 † |
| March | 14% | 12% | 29 | 5 °C | 0% | 86% | 11.6 |
| April | 47% | 16% | 33 | 10 °C | 0% | 49% | 14.4 |
| May | 70% | 23% | 53 | 16 °C | 0% | 12% | 17.1 |
| June | 73% | 26% | 67 | 20 °C | 1% | 1% | 18.8 |
| July | 69% | 29% | 80 | 22 °C | 2% | 0% | 18.0 |
| August | 69% | 31% | 87 | 21 °C | 0% | 0% | 15.6 |
| September | 80% | 18% | 51 | 16 °C | 0% | 3% | 12.7 |
| October | 39% | 18% | 56 | 10 °C | 0% | 51% | 10.0 † |
| November | 6% | 19% | 46 | 4 °C | 0% | 92% | 7.4 † |
| December | 1% | 18% | 44 | 1 °C | 0% | 99% | 5.9 † |
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 Torsång → Stockholm, km/h | Headwind > 15 km/h, Torsång → Stockholm | Headwind > 15 km/h, Stockholm → Torsång | Better way |
|---|---|---|---|---|
| January | +1.4 | 5% | 7% | either |
| February | +1.2 | 4% | 5% | either |
| March | +1.9 | 3% | 8% | either |
| April | +2.1 | 3% | 8% | Torsång → Stockholm |
| May | +0.1 | 3% | 5% | either |
| June | +0.6 | 2% | 5% | either |
| July | +0.1 | 2% | 3% | either |
| August | −0.2 | 3% | 4% | either |
| September | +0.4 | 3% | 6% | either |
| October | +0.8 | 4% | 6% | either |
| November | +0.7 | 4% | 5% | either |
| December | +1.6 | 4% | 6% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | E | +1.7 |
| 25–50 | SE | +0.8 |
| 50–75 | S | −0.9 |
| 75–101 | SE | −0.2 |
| 101–126 | SE | −0.5 |
| 126–151 | SE | +0.9 |
| 151–176 | E | +3.0 |
| 176–201 | SE | +1.3 |
| 201–226 | NE | +3.5 |
| 226–252 | S | −1.4 |
| 252–277 | S | −1.4 |
| 277–302 | S | −2.1 |
| 302–306 | SE | −0.3 |
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.