Castelo Mendo Weather in December
Castelo Mendo in December sees low daytime temperatures of 11°C (52°F) and nighttime lows of 3°C (37°F). Rainfall is fairly high this month at around 77 mm (3 in), so pack a rain jacket to stay dry.
Rainfall in Castelo Mendo in December
You can expect rain on around 14 days based on historical patterns, with 77 mm (3 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Castelo Mendo in December
In December, Castelo Mendo gets low temperatures, with highs of 11°C (52°F). Nights cool to around 3°C (37°F). During December, you'll experience the winter season. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. Nights fall to 3°C (37°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Castelo Mendo in December
The city usually sees around 105 hours of sunlight, indicating a moderately sunny period.If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Castelo Mendo. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Portugal, check out our Castelo Mendo's climate page.
Castelo Mendo Temperature in December
Min Temperature
3°C (37°F)
Max Temperature
11°C (52°F)
Chance of Rain
47%
Precipitation
77 mm (3 in)
Rainy days
14 days
Humidity
78% *
Sunshine
105 hours *
Percentage Sunshine
*
Daily Historical Temperatures
45-year average (1976-2025)
Based on our historical records, temperatures in Castelo Mendo typically stay consistent throughout December, with daily highs averaging around 11°C (52°F). Nights are cold, with lows typically ranging from 2°C (36°F) to 4°C (39°F).
Average temperatures in December
Daily Historical Precipitation
45-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Castelo Mendo in December
Browse day-by-day weather records for Castelo Mendo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Castelo Mendo historical weather extremes in December
According to our 28 years of weather records for Castelo Mendo, the following extremes were recorded between 1997 and 2025.
- On December 29, 2019, temperatures climbed to 19°C (66°F), marking the warmest December day on record.
- The lowest daytime temperature in December was -1°C (30°F), recorded on December 20, 2009.
- Castelo Mendo registered its coldest December night on December 24, 2001, with temperatures dropping to -6°C (21°F).
Best Places in Portugal in December
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in December →
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What to Wear in Castelo Mendo in December
Pack for changing conditions in Castelo Mendo in December. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Rain gear is recommended, you can expect wet weather on multiple days. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Castelo Mendo in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Portugal, check out our Castelo Mendo's climate page.
Temperature Rainfall Sunshine Humidity
See the full Castelo Mendo climate overview or explore weather in Portugal.
