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| Th Jan 14 | Fr Jan 15 | Sa Jan 16 | Su Jan 17 | |
| Tmin 18-06 |
6°C | 3°C | 1°C | 0°C |
| Tmax 06-18 |
8°C | 5°C | 4°C | 4°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 - Llyn Trawsfynydd | Distance |
| Gwynedd | 7.5 km |
| Porthmadog | 15.0 km |
| Harlech | 16.6 km |
| Bala Lake | 21.3 km |
| Barmouth | 21.9 km |
| Snowdonia | 22.3 km |
| Bala | 24.6 km |
| Caernarfon | 34.2 km |
| Llyn Brenig | 34.6 km |
| Llangollen | 35.1 km |
| Lake Vyrnwy | 35.6 km |
| Menai Bridge | 38.1 km |
| Abersoch | 39.2 km |
| Machynlleth | 39.9 km |
| Colwyn Bay | 45.6 km |
| Llŷn Peninsula | 48.0 km |
| Raf Mona | 48.6 km |
| Holyhead | 55.9 km |
| Mold | 59.5 km |
| Aberystwyth | 61.2 km |
| Newtown | 62.5 km |