| Mon May 20 | Tue May 21 | Wed May 22 | Thu May 23 | |
| Tmin 18-06 |
41°F | 42°F | 39°F | 37°F |
| Tmax 06-18 |
59°F | 55°F | 51°F | 46°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 - 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 |
| Forecast: Llyn Trawsfynydd Region After a disappointing Monday the sun will show itself in the two following days. But Monday some rain is to be expected. The daily high falls from 15 degrees on Monday to 11 degrees on Wednesday. |