Rio de Onor Weather in December
December in Rio de Onor brings low temperatures, with daytime highs of 9°C (48°F) and nights around 2°C (36°F). Quite a bit of rainfall is expected, around 115 mm (4.5 in), so pack an umbrella.
Rainfall in Rio de Onor in December
Historically, December sees about 14 days of rain, with a monthly average of 115 mm (4.5 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Rio de Onor in December
In December, expect low temperatures in Rio de Onor, with highs of 9°C (48°F) and lows of 2°C (36°F) at night. Experience the winter season in December. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. At 2°C (36°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Rio de Onor in December
The month experiences a moderate amount of sunlight, with 104 hours of sunshine. This provides a nice balance between sunshine and clouds.
Wind Speed in Rio de Onor in December
Wind speeds average 2 m/s (4 knots) during December. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.December in Rio de Onor has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
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 Rio de Onor's climate page.
Rio de Onor Temperature in December
Min Temperature
2°C (36°F)
Max Temperature
9°C (48°F)
Chance of Rain
46%
Precipitation
115 mm (4.5 in)
Rainy days
14 days
Humidity
84% *
Windspeed
2 m/s (4 knots) *
Sunshine
104 hours *
Percentage Sunshine
39% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Rio de Onor typically stay consistent throughout December, with daily highs averaging around 9°C (48°F). Nights are cold, with lows typically ranging from 1°C (34°F) to 4°C (39°F).
Average temperatures in December
Daily Historical Precipitation
50-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 Rio de Onor in December
Browse day-by-day weather records for Rio de Onor spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Rio de Onor historical weather extremes in December
Based on weather observations in Rio de Onor between 1976 and 2025, these are the recorded extremes during December.
- On December 2, 1985, temperatures climbed to 19°C (66°F), marking the warmest December day on record.
- The coldest December day was on December 31, 1982, with a maximum of -2°C (28°F).
- Rio de Onor registered its coldest December night on December 25, 2001, with temperatures dropping to -9°C (16°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 →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Rio de Onor in December
We recommend to layer up for chilly conditions in Rio de Onor in December. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Rio de Onor 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 Rio de Onor's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Rio de Onor climate overview or explore weather in Portugal.
