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| Su 10 | Mo 11 | Tu 12 | We 13 | Th 14 | Fr 15 | Sa 16 | Su 17 | |
| Tmax (°C) | 4 | 8 | 8 | 10 | 8 | 6 | 4 | 4 |
| Tmin (°C) | -4 | 2 | 7 | 6 | 6 | 3 | 0 | 0 |
| 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 | 35 % | 85 % | 85 % | 80 % | 65 % | 40 % | 30 % | 40 % |
| Sunshine hours | ![]() |
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| (hrs) | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 0.8 | 0.4 | 0.0 |
| UV index | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 |
| Sunrise Sunset |
08:17 16:25 |
08:16 16:27 |
08:15 16:28 |
08:15 16:30 |
08:14 16:31 |
08:13 16:33 |
08:12 16:35 |
08:11 16:36 |
| Wind p.m. | ![]() |
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| Bft | W 2-3 | SW 4-5 | SW 2 | SW 4-5 | NW 2-3 | NE 2 | W 3 | E 3-4 |
| 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 |