| Fri May 24 | Sat May 25 | Sun May 26 | Mon May 27 | |
| Tmin 18-06 |
37°F | 35°F | 35°F | 42°F |
| Tmax 06-18 |
50°F | 57°F | 59°F | 51°F |
| 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 Forecast Locations - Merthyr Tydfil | Distance |
| Caerphilly | 21.2 km |
| Brecon | 22.3 km |
| Cardiff | 28.4 km |
| Forecast: Merthyr Tydfil Region On Saturday it is still clear, clouds will increase subsequently. But on Monday rain is to be expected. From 15 degrees on Sunday the daily high will go down to 11 degrees on Monday. |