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| Th Jan 14 | Fr Jan 15 | Sa Jan 16 | Su Jan 17 | |
| Tmin 18-06 |
6°C | 3°C | 2°C | 1°C |
| Tmax 06-18 |
8°C | 6°C | 5°C | 6°C |
| morning 24-06 |
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| a.m. 06-12 |
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| p.m. 12-18 |
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| evening 18-24 |
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| Nearby Forecast Locations - Porthmadog | Distance |
| Snowdonia | 15.0 km |
| Llyn Trawsfynydd | 15.0 km |
| Caernarfon | 19.3 km |
| Gwynedd | 21.7 km |
| Harlech | 22.4 km |
| Menai Bridge | 24.5 km |
| Barmouth | 31.6 km |
| Raf Mona | 33.7 km |
| Bala Lake | 33.9 km |
| Abersoch | 34.6 km |
| Conwy | 35.7 km |
| Bala | 36.4 km |
| Llyn Brenig | 39.0 km |
| Holyhead | 41.0 km |
| Llŷn Peninsula | 42.2 km |
| Llangollen | 45.0 km |
| Colwyn Bay | 45.8 km |
| Aberdaron | 49.9 km |
| Lake Vyrnwy | 49.9 km |
| Machynlleth | 54.2 km |
| Newtown | 77.5 km |