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| Su 10 | Mo 11 | Tu 12 | We 13 | Th 14 | Fr 15 | Sa 16 | Su 17 | |
| Tmax (°C) | 6 | 9 | 7 | 10 | 8 | 6 | 5 | 6 |
| Tmin (°C) | 2 | 5 | 6 | 4 | 6 | 3 | 2 | 1 |
| 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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| Rain risk | 55 % | 90 % | 65 % | 95 % | 60 % | 30 % | 40 % | 45 % |
| Sunshine hours | ![]() |
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| (hrs) | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 1.6 | 0.8 | 0.8 |
| UV index | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 |
| Sunrise Sunset |
08:26 16:22 |
08:25 16:24 |
08:24 16:25 |
08:23 16:27 |
08:23 16:28 |
08:22 16:30 |
08:21 16:32 |
08:20 16:33 |
| Wind p.m. | ![]() |
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| Bft | SW 2-3 | W 4 | E 1-2 | SW 3-4 | E 1-2 | SE 2 | W 2-3 | S 2-3 |
| 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 |