Ships docked along the shores on the coastal city of Porto, Portugal
Weather in December
December brings the full-on winter chill to Porto. Falling temperatures mark a sharp contrast to the warmth experienced during the peak summer months. The month registers a high rainfall of 181mm (7.13"), making it the wettest month of the year. With reduced sunshine hours and a low UV index, the city engages in festive spirit indoor celebrations. Despite the chill of the Atlantic Ocean, scenic walks along Porto's coastline remain appealing.
Note: For the majority of people, swimming in water at 15.6°C (60.1°F) is not enjoyable. The challenge of controlling breathing escalates as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).
On the first day of the month, sunrise is at 07:40 and sunset at 17:06. On the last day of December, in Porto, sunrise is at 07:59 and sunset at 17:15 WET.
Note: In December, an average UV index of 1 transforms into the following instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Boost your sun resistance with garments that are densely woven yet spacious.
[Resources]Temperature
Porto, Portugal, experiences an average high-temperature of a mild 14.4°C (57.9°F) with the onset of December, subtly varied from November's 17.1°C (62.8°F). Porto records an average low-temperature of 6.9°C (44.4°F) throughout the month of December.Rainfall
December is the month with the most rainfall. Rain falls for 15 days and accumulates 181mm (7.13") of precipitation.Sea temperature
In Porto, in December, the average water temperature is 15.6°C (60.1°F).Note: For the majority of people, swimming in water at 15.6°C (60.1°F) is not enjoyable. The challenge of controlling breathing escalates as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 07:40 and sunset at 17:06. On the last day of December, in Porto, sunrise is at 07:59 and sunset at 17:15 WET.
Sunshine
January and December, with an average of 4h of sunshine, are months with the least sunshine.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In December, an average UV index of 1 transforms into the following instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What are December temperatures in Porto?
In Porto, 14.4°C (57.9°F) is the average high-temperature and 6.9°C (44.4°F) is the average low-temperature during December.
What is the rainiest month in Porto?
The month with the most rainfall in Porto, Portugal, is December, when the rain falls for 15 days and typically aggregates up to 181mm (7.13") of precipitation.
How much does it rain in Porto in December?
In Porto, in December, during 15 rainfall days, 181mm (7.13") of precipitation is typically accumulated.
How cold is the water in December in Porto?
In December, the average sea temperature in Porto is 15.6°C (60.1°F). Swimming in 15.6°C (60.1°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).
What is the month with the shortest days in Porto?
December has the shortest days of the year in Porto, with an average of 9h and 18min of daylight.
What is the average length of the day in December in Porto?
In December, the average day length is 9h and 16min.
When are sunrise and sunset in December in Porto?
In December, on the first day of the month, sunrise is at 07:40 and sunset at 17:06. On the last day of the month, in Porto, Portugal, sunrise is at 07:59 and sunset at 17:15 WET.
What are the months with the least sunshine in Porto?
January and December, with an average of 4h of sunshine, are months with the least sunshine.
How long on average sun shines in December in Porto?
In December, the average sunshine duration in Porto is 4h.
When is the lowest UV index in Porto?
December is the month with the lowest UV index in Porto, Portugal, with an average maximum UV index of 1.
How high is the UV index in December in Porto?
In Porto, Portugal, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
Average temperature in December
Porto, Portugal
- Average high temperature in December: 14.4°C
The warmest month (with the highest average high temperature) is August (25.7°C).
The month with the lowest average high temperature is January (13.8°C).
- Average low temperature in December: 6.9°C
The months with the highest average low temperature are July and August (15.9°C).
The coldest month (with the lowest average low temperature) is January (5.2°C).
Average rainfall in December
Porto, Portugal
- Average rainfall in December: 181mm
The wettest month (with the highest rainfall) is December (181mm).
The driest month (with the least rainfall) is July (20.4mm).
Average rainfall days in December
Porto, Portugal
- Average rainfall days in December: 15 days
The month with the highest number of rainy days is January (17 days).
The month with the least rainy days is August (5 days).
Average sea temperature in December
Porto, Portugal
- Average sea temperature in December: 15.6°C
The best month for swimming (with the highest average sea temperature) is September (18.2°C).
The coldest months (with the lowest average sea temperature) are February and March (13.8°C).
Average daylight in December /
Average sunshine in December
Porto, Portugal
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The months with the least sunshine are January and December (Average sunshine: 4h and 0min).
Average UV index in December
Porto, Portugal
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 1).
Porto, Portugal
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