| Sat May 25 | Sun May 26 | Mon May 27 | Tue May 28 | |
| Tmin 18-06 |
35°F | 42°F | 46°F | 46°F |
| Tmax 06-18 |
57°F | 59°F | 55°F | 53°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 - Porthmadog | Distance |
| Snowdonia | 15.0 km |
| Llyn Trawsfynydd | 15.0 km |
| Caernarfon | 19.3 km |
| Gwynedd | 21.7 km |
| Harlech | 22.4 km |
| Menai Bridge | 24.5 km |
| Forecast: Porthmadog Region While on Sunday it's clear, Monday is overcast. On Monday and Tuesday precipitation is expected. The maximum temperature lies around 12 degrees. |