EuroVelo 1 - Atlantic Coast Route - part Ireland, stage 15: Westport → near Knocknalower
On stage 15 (Westport → near Knocknalower, 122 km) the best month is September: 67% of days were dry with highs of 10–30 °C, and riding Westport → near Knocknalower meant an average tailwind of 2.8 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 | 14% | 36% | 110 | 8 °C | 0% | 72% | 7.9 † |
| February | 16% | 37% | 100 | 8 °C | 0% | 72% | 9.7 † |
| March | 28% | 34% | 88 | 9 °C | 0% | 58% | 11.7 |
| April | 54% | 32% | 70 | 12 °C | 0% | 25% | 14.0 |
| May | 61% | 37% | 85 | 14 °C | 0% | 4% | 16.0 |
| June | 63% | 36% | 86 | 16 °C | 0% | 0% | 17.1 |
| July | 55% | 45% | 98 | 17 °C | 0% | 0% | 16.6 |
| August | 56% | 44% | 111 | 17 °C | 0% | 0% | 14.8 |
| September | 67% | 33% | 97 | 16 °C | 0% | 0% | 12.6 |
| October | 60% | 38% | 119 | 13 °C | 0% | 5% | 10.4 † |
| November | 32% | 40% | 120 | 10 °C | 0% | 44% | 8.4 † |
| December | 14% | 41% | 130 | 9 °C | 0% | 67% | 7.4 † |
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 Westport → near Knocknalower, km/h | Headwind > 15 km/h, Westport → near Knocknalower | Headwind > 15 km/h, near Knocknalower → Westport | Better way |
|---|---|---|---|---|
| January | +5.0 | 11% | 26% | Westport → near Knocknalower |
| February | +5.5 | 11% | 29% | Westport → near Knocknalower |
| March | +2.8 | 14% | 23% | Westport → near Knocknalower |
| April | +1.3 | 14% | 20% | either |
| May | +0.9 | 13% | 19% | either |
| June | +0.3 | 13% | 17% | either |
| July | +0.8 | 12% | 16% | either |
| August | +2.1 | 12% | 21% | Westport → near Knocknalower |
| September | +2.8 | 11% | 22% | Westport → near Knocknalower |
| October | +4.6 | 10% | 26% | Westport → near Knocknalower |
| November | +2.9 | 14% | 23% | Westport → near Knocknalower |
| December | +5.1 | 11% | 28% | Westport → near Knocknalower |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 1,687–1,713 | NW | −2.8 |
| 1,713–1,739 | N | +2.1 |
| 1,739–1,764 | NW | −0.2 |
| 1,764–1,789 | N | +6.8 |
| 1,789–1,809 | E | +9.2 |
Other stages
- Ballygerry → Trá Mhór 130 km
- Trá Mhór → Midleton 129 km
- Midleton → Clonakilty 137 km
- Clonakilty → near Schull 122 km
- near Schull → Castletownbere 122 km
- Castletownbere → near Killorglin 122 km
- near Killorglin → Killorglin 115 km
- Killorglin → Tralee 109 km
- Tralee → Limerick 120 km
- Limerick → Kilrush 110 km
- Kilrush → Lehinch 120 km
- Lehinch → Galway 127 km
- Galway → near Clifden 121 km
- near Clifden → Westport 109 km
- Westport → near Knocknalower 122 km
- near Knocknalower → near Ballina 121 km
- near Ballina → Ballyshannon 137 km
- Ballyshannon → Gweedore 121 km
- Gweedore → Londonderry County Borough 139 km
- Londonderry County Borough → Cookstown 112 km
- Cookstown → Belfast 96 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.