| Mon May 20 | Tue May 21 | Wed May 22 | Thu May 23 | |
| Tmin 18-06 |
4°C | 7°C | 4°C | 4°C |
| Tmax 06-18 |
14°C | 13°C | 12°C | 8°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 |
| Nearby Weather Stations - Llyn Trawsfynydd | Distance |
| Capel Curig | 22.3 km |
| Bala | 24.6 km |
| Lake Vyrnwy | 35.6 km |
| Rhyl | 48.6 km |
| Raf Mona | 48.6 km |
| Aberdaron | 55.3 km |
| Valley | 55.9 km |
| Trawscoed | 61.2 km |
| Hawarden | 70.2 km |
| Crosby | 88.3 km |
| Sennybridge | 95.2 km |
| Aberporth | 95.5 km |