EXTPRT
EXPERIMENTAL LONGRANGE FOR VALONGO
EXPERIMENTAL FORECAST OFFICE - PORTO METRO
05:22 UTC THU DEC 25 2025
Long-Range Forecast - Valongo
Issued: 05:22 UTC Thursday, December 25, 2025 | Valid: 15 days
| Date | Conditions | Low | High | Notes |
|---|---|---|---|---|
| Dec 25 | Clear | 2°C | 10°C | Dry, light winds. Good day for outdoor activities. |
| Dec 26 | Clear | 0°C | 10°C | Dry, but near or just below freezing overnight. Frost possible. Pack warm layers for early morning. |
| Dec 27 | Clear | 2°C | 10°C | Dry, breezy with gusts to 51 km/h. Frost unlikely. |
| Dec 28 | Clear | 5°C | 12°C | Dry, milder. Comfortable for daytime walks. |
| Dec 29 | Clear | 4°C | 14°C | Dry, one of the mildest days. Ideal for outdoor plans. |
| Dec 30 | Clear | 3°C | 13°C | Dry, mild. No weather concerns. |
| Dec 31 | Overcast | 2°C | 8°C | Dry, cooler. Cloudy skies may limit sunshine. |
| Jan 1 | Light Drizzle | -1°C | 8°C | Brief light drizzle (11h), low accumulation. Freezing temps overnight. Icy spots possible on untreated surfaces. |
| Jan 2 | Light Drizzle | 1°C | 6°C | Light drizzle for much of the day. Cool and damp. Slippery conditions possible. |
| Jan 3 | Clear | 1°C | 6°C | Dry, brief light precip possible (1h). Frost possible overnight. |
| Jan 4 | Clear | -2°C | 7°C | Dry, coldest night of the period. Widespread frost. Freezing temps overnight. |
| Jan 5 | Light Drizzle | 3°C | 7°C | Light drizzle for nearly 24 hours. Gusts to 41 km/h. Cool and damp. |
| Jan 6 | Light Drizzle | 5°C | 9°C | Persistent drizzle, highest rainfall total (25.8mm). Gusts to 73 km/h. Avoid prolonged outdoor exposure. |
| Jan 7 | Light Drizzle | 5°C | 8°C | Continued drizzle, moderate rainfall (6.7mm). Strong gusts near 72 km/h. Slippery roads. |
| Jan 8 | Clear | 2°C | 8°C | Mostly dry, brief light precip possible (1h). Improving. Frost possible overnight. |
Trend Summary
After a dry and generally mild start to the period, temperatures dip below freezing on the nights of Dec 26 and especially Jan 4, raising frost and potential icy spot concerns. The first few days are sunny and favorable for outdoor activities. Starting Jan 1, a shift toward cooler, wetter conditions begins, with light drizzle becoming persistent from Jan 5 through Jan 7. The wettest and windiest period is expected Jan 6–7, with gusts over 70 km/h and cumulative rainfall up to 26 mm. While no heavy storms are indicated, the prolonged damp and cool weather may lead to slippery conditions. The period ends with a return to drier weather on Jan 8, though another cold night is possible.
Temperatures trend downward from Dec 29 through Jan 4, then rise slightly during the wet phase. No snow is indicated in the data, and wet-bulb temperatures remain at or just above freezing except for brief overnight dips. Any frozen precipitation would be brief and localized, if it occurs at all, and cannot be ruled out on the coldest nights (Jan 1, Jan 4), particularly on elevated or untreated surfaces. However, the most likely outcome remains light rain or drizzle during wet periods, with frost the primary winter hazard.
Low confidence exists in the exact timing and intensity of drizzle from Jan 5–7, as models show slight variations in duration and onset. Small-scale coastal effects may cause localized differences in rainfall and wind.
Experimental forecast - not official guidance