EXTPRT
EXPERIMENTAL LONGRANGE FOR SANTO TIRSO
EXPERIMENTAL FORECAST OFFICE - PORTO METRO
05:22 UTC THU DEC 25 2025
Long-Range Forecast - Santo Tirso
Issued: 05:22 UTC Thu Dec 25 2025 | Valid: 15 days
| Date | Conditions | Low | High | Notes |
|---|---|---|---|---|
| Dec 25 | Clear | 3°C | 10°C | Dry night; cool morning, mild afternoon. Good day for outdoor activities. |
| Dec 26 | Clear | 1°C | 10°C | Frost possible overnight. 30% chance of light showers late. Pack warm layers if out after dark. |
| Dec 27 | Clear | 2°C | 11°C | Dry but windy (gusts to 45 km/h). Wet-bulb temp -1°C — brief frost on untreated surfaces possible. |
| Dec 28 | Clear | 5°C | 14°C | Milder. Dry and breezy. Pleasant for outdoor plans. |
| Dec 29 | Clear | 3°C | 14°C | Similar to previous day. Dry. Cool night, warm day. |
| Dec 30 | Clear | 3°C | 13°C | Dry and stable. Ideal for outdoor activities. |
| Dec 31 | Overcast | 1°C | 8°C | Dry but cooler. Cloudy skies. Frost likely in sheltered areas overnight. |
| Jan 1 | Clear | 0°C | 8°C | Light precipitation possible (0.6mm, 10% chance). Wet-bulb temp -1°C — brief dampness may freeze on contact. |
| Jan 2 | Light Drizzle | -1°C | 6°C | Light rain likely (2.1mm, 10% prob). Wet-bulb temp -1°C — icy patches cannot be ruled out, especially on untreated surfaces. |
| Jan 3 | Clear | 1°C | 6°C | Dry with light winds. Brief light precip possible (0.3mm, 13% chance). Frost in the morning. |
| Jan 4 | Clear | -2°C | 7°C | Freezing night. Wet-bulb temp -3°C. Frost widespread. No precip expected, but icy conditions possible on elevated or shaded surfaces. |
| Jan 5 | Light Drizzle | 3°C | 8°C | Light rain over many hours (11.1mm, 5% prob). Breezy (gusts to 46 km/h). Roads may be slick. |
| Jan 6 | Slight Rain | 5°C | 9°C | Rain likely all day (28.4mm, 10% prob). Strong gusts to 75 km/h. Travel impacts possible. |
| Jan 7 | Light Drizzle | 6°C | 8°C | Persistent light rain (10.2mm, 19% prob). Windy (gusts to 71 km/h). Stay dry if outdoors. |
| Jan 8 | Clear | 2°C | 8°C | Improving. Only 0.1mm possible (23% chance). Frost likely overnight. |
Trend Summary
After a stretch of dry, mild weather through the weekend, a gradual cooling trend begins late December 31, leading to near- or below-freezing overnight temperatures from January 1 to January 4. The most notable shift occurs around January 5–7, when a wetter and windier pattern arrives, bringing prolonged light to moderate rain and gusty conditions. Although total rainfall amounts are moderate, the combination of saturated ground, wind, and cool temperatures may lead to localized travel concerns. The week of January 5–7 shows some model consistency in timing, but exact rainfall intensity and wind gusts remain uncertain due to small-scale storm track variations. Conditions improve by January 8 with drier, calmer weather returning.
Freezing temperatures early in the new year mean that even brief precipitation events (like on Jan 1 and Jan 2) could lead to slippery spots on untreated roads, sidewalks, or elevated surfaces. While snow is not indicated in any model run, a brief change to sleet or snow cannot be entirely ruled out at higher elevations near the interior on Jan 4 if temperatures dip faster than expected — though this remains a low-probability scenario.
Overall, the first week of January is cooler and wetter than the mild, stable conditions of late December. Residents should prepare for frosty mornings, wet roads during the early January rain period, and windy conditions midweek.
Experimental forecast - not official guidance