EXTPRT
EXPERIMENTAL LONGRANGE FOR AROUCA
EXPERIMENTAL FORECAST OFFICE - PORTO METRO
05:22 UTC THU DEC 25 2025
Long-Range Forecast - Arouca
Issued: 05:22 UTC Thu Dec 25 2025 | Valid: 15 days
| Date | Conditions | Low | High | Notes |
|---|---|---|---|---|
| Dec 25 | Clear | 2°C | 11°C | Dry, light winds. Good day for outdoor activities. |
| Dec 26 | Clear | 1°C | 11°C | Slight chance of precipitation. Frost possible overnight. Pack warm layers. |
| Dec 27 | Clear | 2°C | 12°C | Dry, gusty afternoon. Minimal rain risk. |
| Dec 28 | Clear | 3°C | 14°C | Dry and mild for late December. Ideal for daytime walks. |
| Dec 29 | Clear | 2°C | 14°C | Dry, stable conditions continue. |
| Dec 30 | Clear | 4°C | 13°C | Warmest day of the period. No rain expected. |
| Dec 31 | Overcast | 3°C | 7°C | Dry but cooler. Cloudy skies may limit outdoor visibility. |
| Jan 1 | Overcast | 1°C | 8°C | Trace rain possible (1.8mm), low chance. Frost likely overnight. |
| Jan 2 | Light Drizzle | 2°C | 7°C | Light, prolonged drizzle (2.7mm). Roads may be damp. |
| Jan 3 | Mainly Clear | 1°C | 6°C | Brief rain possible (0.3mm), gusty. Frost risk at night. |
| Jan 4 | Clear | -1°C | 8°C | Freezing night. Frost widespread. No rain expected. |
| Jan 5 | Light Drizzle | 3°C | 8°C | Light rain (9.4mm), windy (gusts to 50 km/h). |
| Jan 6 | Light Drizzle | 6°C | 10°C | Steady drizzle (31.7mm), windy (gusts to 70 km/h). |
| Jan 7 | Moderate Drizzle | 5°C | 8°C | Persistent rain (13.4mm), strong gusts. Travel delays possible. |
| Jan 8 | Clear | 3°C | 8°C | Brief rain possible (0.1mm), otherwise dry. |
Trend Summary
After a stretch of dry, mild weather through December 30, a shift arrives around New Year’s Eve. Clouds increase, and temperatures drop, bringing cooler conditions starting January 1. Light rain and drizzle become more frequent from January 1 through January 7, with the wettest and windiest period likely January 5–7. Rainfall amounts are not extreme but could lead to damp conditions and minor ponding on untreated surfaces. The most notable feature is the return of freezing overnight temperatures, especially on January 4, when frost and possible black ice are likely.
Temperatures fluctuate but trend cooler through early January, with daytime highs dropping from the mid-teens to around 8°C. The weekend of January 3–4 brings the coldest air of the period, with a real chance of frost each night. Any precipitation during the Jan 1–4 window will remain rain or drizzle, as surface temperatures stay near or just above freezing—no snow is indicated at this time.
Model guidance shows stable trends in temperature and precipitation, with low spread in recent runs. Confidence is moderate through January 5, decreasing slightly for January 6–7 due to uncertainty in the duration and intensity of the low-pressure system affecting the region.
Practical Notes:
- January 4 is the coldest night: plan for freezing conditions, especially on rural or shaded roads.
- January 6 may see the highest rainfall total—consider waterproof gear if outdoors.
- Despite modest totals, repeated drizzle from Jan 1–7 may affect comfort and road conditions.
- No snow is forecast at this time. If temperatures dip below freezing during precipitation, brief sleet or snow flurries cannot be ruled out at higher elevations near Arouca, but accumulation is not expected and would be brief and localized.
Experimental forecast - not official guidance