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Best Time for Conwy to Porthmadog through Eryri
Last updated:
Preferred months for this journey: May, June, July, August, September. Check the seasonal notes before choosing your dates.
💡 Good to know
- The mountain railway runs to the summit and the passes are clear — prime Snowdon weather, by Welsh standards.
- Winter conditions on Snowdon are serious; castles and slate caverns are the reliable days out.
| Month | Low | High | Rain | Daylight | |
|---|---|---|---|---|---|
| January | 4.5°C | 7.2°C | 118 mm | 7.8 h | 💨 |
| February | 4.0°C | 6.9°C | 97 mm | 9.5 h | 💨 |
| March | 4.4°C | 8.1°C | 87 mm | 11.5 h | |
| April | 6.1°C | 10.4°C | 69 mm | 13.7 h | |
| May | 8.7°C | 13.2°C | 75 mm | 15.6 h | |
| June | 11.5°C | 15.7°C | 85 mm | 16.7 h | |
| July | 13.2°C | 17.1°C | 97 mm | 16.2 h | |
| August | 13.5°C | 17.1°C | 107 mm | 14.5 h | |
| September | 12.1°C | 15.9°C | 101 mm | 12.4 h | |
| October | 10.1°C | 13.2°C | 128 mm | 10.3 h | 💨 |
| November | 7.5°C | 10.2°C | 136 mm | 8.3 h | 💨 |
| December | 5.5°C | 8.1°C | 141 mm | 7.3 h | 💨 |