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| Th Jan 14 | Fr Jan 15 | Sa Jan 16 | Su Jan 17 | |
| Tmin 18-06 |
6°C | 3°C | 0°C | 0°C |
| Tmax 06-18 |
8°C | 6°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 - Merthyr Tydfil | Distance |
| Caerphilly | 21.2 km |
| Brecon | 22.3 km |
| Abergavenny | 25.8 km |
| Cardiff | 28.4 km |
| Bridgend | 29.4 km |
| Newport | 30.6 km |
| Neath Port Talbot | 31.3 km |
| South Wales | 37.4 km |
| Porthcawl | 37.6 km |
| Cambrian Mountains | 40.9 km |
| Swansea | 46.5 km |
| Weston-super-Mare | 50.3 km |
| Coleford | 53.1 km |
| Llanelli | 54.6 km |
| Hereford | 55.1 km |
| Bristol Airport | 59.5 km |
| Minehead | 59.8 km |
| Bristol | 60.8 km |
| Bridgwater | 71.1 km |
| Ilfracombe | 79.7 km |
| Glastonbury | 81.2 km |