Lakes Route, stage 4: Niederurnen → Rorschach
On stage 4 (Niederurnen → Rorschach, 127 km) the best month is September: 63% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.8 km/h on average; ERA5 2006–2025, 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 | 2% | 28% | 115 | 2 °C | 0% | 97% | 8.9 † |
| February | 10% | 27% | 86 | 4 °C | 0% | 89% | 10.2 † |
| March | 28% | 33% | 112 | 7 °C | 0% | 68% | 11.8 |
| April | 50% | 34% | 117 | 12 °C | 0% | 36% | 13.6 |
| May | 45% | 54% | 192 | 16 °C | 0% | 15% | 15.1 |
| June | 47% | 52% | 198 | 20 °C | 1% | 3% | 15.9 |
| July | 47% | 50% | 207 | 21 °C | 3% | 1% | 15.6 |
| August | 52% | 45% | 216 | 21 °C | 2% | 1% | 14.2 |
| September | 63% | 35% | 148 | 17 °C | 0% | 7% | 12.5 |
| October | 60% | 28% | 118 | 13 °C | 0% | 24% | 10.8 † |
| November | 24% | 27% | 111 | 7 °C | 0% | 73% | 9.2 † |
| December | 3% | 32% | 121 | 3 °C | 0% | 96% | 8.5 † |
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 Niederurnen → Rorschach, km/h | Headwind > 15 km/h, Niederurnen → Rorschach | Headwind > 15 km/h, Rorschach → Niederurnen | Better way |
|---|---|---|---|---|
| January | +0.8 | 0% | 0% | either |
| February | +0.3 | 0% | 0% | either |
| March | −0.3 | 1% | 0% | either |
| April | −0.9 | 1% | 0% | either |
| May | −1.0 | 0% | 0% | either |
| June | −1.2 | 0% | 0% | either |
| July | −0.9 | 0% | 0% | either |
| August | −0.8 | 0% | 0% | either |
| September | −0.8 | 0% | 0% | either |
| October | −0.1 | 0% | 0% | either |
| November | +0.5 | 0% | 0% | either |
| December | +1.1 | 0% | 0% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 374–399 | E | +0.8 |
| 399–425 | NE | −0.2 |
| 425–450 | N | −2.0 |
| 450–475 | NE | −1.0 |
| 475–501 | W | −1.4 |
Other stages
- Montreux → Spiez 136 km
- Spiez → Luzern 115 km
- Luzern → Niederurnen 124 km
- Niederurnen → Rorschach 127 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.