EXTPRT
EXPERIMENTAL LONGRANGE FOR PORTO
EXPERIMENTAL FORECAST OFFICE - PORTO METRO
05:22 UTC THU DEC 25 2025
Long-Range Forecast - Porto
Issued: 05:22 UTC, Thursday, 25 December 2025 | Valid: 15 days
| Date | Conditions | Low | High | Notes |
|---|---|---|---|---|
| 2025-12-25 | Clear | 5°C | 11°C | Light winds, dry. Good day for outdoor activities. |
| 2025-12-26 | Mostly Clear | 3°C | 11°C | Slight chance of light rain. Cold night; pack warm layers. |
| 2025-12-27 | Clear | 5°C | 11°C | Dry, breezy at times. Low chance of showers. |
| 2025-12-28 | Clear | 8°C | 14°C | Milder. Dry and calm. Ideal for outdoor plans. |
| 2025-12-29 | Clear | 6°C | 13°C | Dry and stable. Pleasant afternoon. |
| 2025-12-30 | Clear | 4°C | 12°C | Dry, cool night. Frost possible in sheltered areas. |
| 2025-12-31 | Overcast | 3°C | 9°C | Dry but cloudy. Chilly, especially in the morning. |
| 2026-01-01 | Clear | 2°C | 8°C | Very cold night. Patchy frost possible. Light rain not ruled out late. |
| 2026-01-02 | Moderate Drizzle | 2°C | 8°C | Prolonged light rain. Roads may be slick. Carry a raincoat. |
| 2026-01-03 | Clear | 3°C | 8°C | Brief shower possible. Otherwise dry and cool. |
| 2026-01-04 | Clear | 1°C | 8°C | Coldest night of period. Frost likely. Wet-bulb near 0°C—icy patches cannot be ruled out. |
| 2026-01-05 | Light Drizzle | 5°C | 10°C | Rain for much of the day. Breezy. Wind gusts up to 56 km/h. |
| 2026-01-06 | Slight Rain | 8°C | 11°C | Rain all day, heaviest in the afternoon. Strong gusts to 84 km/h. |
| 2026-01-07 | Moderate Drizzle | 8°C | 10°C | Persistent damp and windy. Gusts near 82 km/h. |
| 2026-01-08 | Clear | 5°C | 9°C | Brief shower possible. Otherwise dry, quiet end to period. |
Trend Summary
After a dry and mild start to the period, temperatures gradually cool through the end of December, with a notable dip around New Year’s Eve and into early January. The coldest night is expected on 4 January, with temperatures near freezing—frost and isolated icy patches are possible, especially on untreated surfaces.
From 2 January, a shift in the pattern brings wetter and windier conditions, with light to moderate rain spreading into the region. The most persistent rain occurs 5–7 January, coinciding with stronger winds. While total rainfall is modest, the duration and cool temperatures may lead to slick conditions.
No snow is indicated at sea level. However, on 4 January, with wet-bulb temperatures near 0°C and overnight lows at 1°C, brief sleet or snow flurries over higher ground near Porto cannot be ruled out, though accumulation is not expected and would be brief if it occurs.
Model trends have been stable, with consistent temperature and precipitation signals over the past few runs. Confidence is moderate for the first week, decreasing slightly beyond 6 January due to timing and intensity of rain bands.
Overall, the period transitions from dry and cool to unsettled and damp by early January, then settles again by the 8th.
Practical Notes:
- 25–29 Dec: Excellent conditions for walking, sightseeing, or outdoor dining.
- 31 Dec–4 Jan: Cold nights—protect plants and pipes. Frost possible.
- 5–7 Jan: Wind and rain—secure loose items outdoors, allow extra travel time.
- 8 Jan: Return to calmer weather—good window for outdoor tasks.
Experimental forecast - not official guidance