More often than not you can expect weather in Porthmadog right-through August is 14, with highs being around 18 with low average temperatures being 13. Our table below has the full details:
| Month | Degrees Celsius |
|---|---|
| Temperature | 14 |
| High Temperature | 18 |
| Low Temperature | 13 |
Useful Links: Porthmadog Weather: Average Weather & Yearly Climate