Weather in Viana do Castelo for December 2025
Expect cooler weather in first days of December 2025 in Viana do Castelo with the forecast suggesting a temperature of 14.1 °C, lower than the historical average.
In general, the average temperature in Viana do Castelo at the beginning of December is 15 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 14.3 °C by the end of December.
Viana do Castelo experiences moderate rainfall in December, with an average of 9 rainy days and a total precipitation of 421.9 mm.
Is December a good time to visit Viana do Castelo? check out the best time to travel to Viana do Castelo page.
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Viana do Castelo Weather December
Temperatures trend during December in Viana do Castelo
December weather in Viana do Castelo day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Dec. |  Patchy rain possible | 15° /13° | 2.5 mm | 3 | |
| 2 Dec. | Patchy rain possible | 17° /15° | 1.4 mm | 4 | |
| 3 Dec. | Patchy rain possible | 16° /14° | 0.5 mm | 3 | |
| 4 Dec. |  Cloudy | 15° /12° | 0 mm | 3 | |
| 5 Dec. |  Overcast | 13° /9° | 0 mm | 4 | |
| 6 Dec. | Cloudy | 14° /8° | 0.2 mm | 4 | |
| 7 Dec. |  Moderate or heavy rain shower | 15° /9° | 35.2 mm | 4 | |
| 8 Dec. | Light rain shower | 13° /9° | 2.3 mm | 3 | |
| 9 Dec. | Light rain shower | 15° /10° | 4.1 mm | 4 | |
| 10 Dec. | Light rain shower | 14° /10° | 0.9 mm | 4 | |
| 11 Dec. | Light rain shower | 13° /10° | 1.5 mm | 4 | |
| 12 Dec. |  Moderate rain | 13° /9° | 9.3 mm | 4 | |
| 13 Dec. | Light rain shower | 12° /8° | 4.3 mm | 3 | |
| 14 Dec. |  Sunny | 14° /8° | 0.2 mm | 4 | |
| 15 Dec. | Sunny | 14° /7° | 0 mm | 5 | |
| 16 Dec. | Sunny | 14° /7° | 0 mm | 4 | |
| 17 Dec. | Sunny | 15° /8° | 1.1 mm | 4 | |
| 18 Dec. | Sunny | 15° /10° | 11.9 mm | 4 | |
| 19 Dec. | Sunny | 14° /7° | 4.6 mm | 4 | |
| 20 Dec. | Patchy rain possible | 13° /6° | 0.5 mm | 4 | |
| 21 Dec. |  Partly cloudy | 14° /7° | 0 mm | 4 | |
| 22 Dec. |  Heavy rain at times | 16° /10° | 3.1 mm | 5 | |
| 23 Dec. | Sunny | 15° /10° | 1.9 mm | 4 | |
| 24 Dec. | Sunny | 14° /9° | 9.9 mm | 4 | |
| 25 Dec. | Moderate or heavy rain shower | 15° /9° | 15.5 mm | 4 | |
| 26 Dec. | Moderate rain at times | 14° /9° | 1.3 mm | 4 | |
| 27 Dec. | Partly cloudy | 14° /9° | 0.1 mm | 4 | |
| 28 Dec. | Moderate rain at times | 14° /10° | 9.5 mm | 3 | |
| 29 Dec. | Moderate or heavy rain shower | 14° /10° | 12.8 mm | 3 | |
| 30 Dec. | Moderate or heavy rain shower | 15° /10° | 9.5 mm | 3 | |
| 31 Dec. | Moderate or heavy rain shower | 14° /9° | 11.3 mm | 4 | |
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Viana do Castelo weather in December vs November vs January
| November | December | January | |
|---|---|---|---|
| Weather | Light rain shower | Patchy rain possible | Patchy rain possible |
| Temperatures | 18°/11° | 15°/7° | 15°/5° |
| Rainfall | 663 mm | 422 mm | 659 mm |
| Wind | 21.4 km/h | 19.6 km/h | 23.1 km/h |
| Humidity | 81% | 79% | 79% |
| Rainy days | 17 days | 9 days | 20 days |
| Dry days | 13 days | 22 days | 11 days |
Planning a trip to Viana do Castelo? Discover the best time to visit
Viana do Castelo in December - FAQ
What to pack to Viana do Castelo in December?
As you prepare for your trip to Viana do Castelo in December, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Viana do Castelo, during December, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
December rainfall patterns in Viana do Castelo
Quick links
Where is Viana do Castelo?Get accurate weather forecasts for Viana do Castelo, located at latitude 41.693 and longitude -8.833. Stay updated with localized weather information tailored for Viana do Castelo.