December weather forecast
Cacilhas, Portugal

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Weather in December

The first month of the winter, December, is also a moderate month in Cacilhas, Portugal, with an average temperature fluctuating between 15.7°C (60.3°F) and 12°C (53.6°F).

Temperature

On the advent of December, Cacilhas's average high-temperature exhibits a minor adjustment to a still refreshing 15.7°C (60.3°F) from November's 17.4°C (63.3°F). During December, nights in Cacilhas, Portugal, cool slightly to an average low of 12°C (53.6°F).

Humidity

January, April, July and December, with an average relative humidity of 75%, are the most humid months.

Rainfall

In Cacilhas, in December, during 8.3 rainfall days, 29mm (1.14") of precipitation is typically accumulated. Throughout the year, in Cacilhas, there are 85.8 rainfall days, and 215mm (8.46") of precipitation is accumulated.

Sea temperature

In December, the average sea temperature in Cacilhas is 16.6°C (61.9°F).
Note: Most people find swimming in 16.6°C (61.9°F) to be not enjoyable. The control of one's breathing becomes more challenging as the water temperature drops below 21°C (69.8°F).

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of December in Cacilhas, Portugal, sunrise is at 07:36 and sunset at 17:15. On the last day of the month, sunrise is at 07:54 and sunset at 17:25 WET.

Sunshine

In Cacilhas, the average sunshine in December is 6h.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A typical high UV index of 4 in December suggests the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
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Frequently asked questions

What is the average December temperature in Cacilhas?

Cacilhas in December has an average high-temperature of 15.7°C (60.3°F) and an average low-temperature of 12°C (53.6°F).

What are the most humid months in Cacilhas?

January, April, July and December, with an average relative humidity of 75%, are most humid months.

What is the average humidity in December in Cacilhas?

In Cacilhas, Portugal, the average relative humidity in December is 75%.

How many days does it rain in December in Cacilhas?

In Cacilhas, in December, it is raining for 8.3 days, with typically 29mm (1.14") of accumulated precipitation.

How cold is the water in December in Cacilhas?

In December, the average sea temperature in Cacilhas, Portugal, is 16.6°C (61.9°F). Swimming in 16.6°C (61.9°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 Cacilhas?

The month with the shortest days in Cacilhas, Portugal, is December, with an average of 9h and 30min of daylight.

What is the average length of the day in December in Cacilhas?

In December, the average day length in Cacilhas, Portugal, is 9h and 31min.

What time are sunrise and sunset in December in Cacilhas?

In December, on the first day of the month, sunrise is at 07:36 and sunset at 17:15. On the last day of the month, in Cacilhas, Portugal, sunrise is at 07:54 and sunset at 17:25 WET.

How long on average sun shines in December in Cacilhas?

In Cacilhas, Portugal, the average sunshine duration in December is 6h.

When is the lowest UV index in Cacilhas?

The months with the lowest UV index in Cacilhas, Portugal, are January through March, November and December, with an average maximum UV index of 4.

What is the UV index reading in December in Cacilhas?

In December, the average daily maximum UV index in Cacilhas is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.

Average temperature in December
Cacilhas, Portugal

Average temperature in December - Cacilhas, Portugal
  • Average high temperature in December: 15.7°C

The warmest month (with the highest average high temperature) is August (24.5°C).
The month with the lowest average high temperature is January (14.8°C).

  • Average low temperature in December: 12°C

The month with the highest average low temperature is August (18.6°C).
The coldest month (with the lowest average low temperature) is February (10.8°C).

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Average pressure in December
Cacilhas, Portugal

Average pressure in December - Cacilhas, Portugal
  • Average pressure in December: 1022.5mbar

The months with the highest atmospheric pressure are January and December (1022.5mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).

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Average wind speed in December
Cacilhas, Portugal

Average wind speed in December - Cacilhas, Portugal
  • Average wind speed in December: 17.9km/h

The windiest month (with the highest average wind speed) is February (19.5km/h).
The calmest month (with the lowest average wind speed) is October (15.6km/h).

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Average humidity in December
Cacilhas, Portugal

Average humidity in December - Cacilhas, Portugal
  • Average humidity in December: 75%

The months with the highest relative humidity are January, April, July and December (75%).
The months with the lowest relative humidity are May and October (72%).

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Average rainfall in December
Cacilhas, Portugal

Average rainfall in December - Cacilhas, Portugal
  • Average rainfall in December: 29mm

The wettest month (with the highest rainfall) is November (44mm).
The driest month (with the least rainfall) is July (2mm).

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Average rainfall days in December
Cacilhas, Portugal

Average rainfall days in December - Cacilhas, Portugal
  • Average rainfall days in December: 8.3 days

The month with the highest number of rainy days is November (12.4 days).
The month with the least rainy days is August (1.9 days).

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Average sea temperature in December
Cacilhas, Portugal

Average sea temperature in December - Cacilhas, Portugal
  • Average sea temperature in December: 16.6°C

The best month for swimming (with the highest average sea temperature) is September (19.9°C).
The coldest month (with the lowest average sea temperature) is March (15.1°C).

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Average daylight in December /
Average sunshine in December
Cacilhas, Portugal

Average daylight in December / Average sunshine in December - Cacilhas, Portugal
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).

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Average sunshine days in December
Cacilhas, Portugal

Average sunshine days in December - Cacilhas, Portugal
  • Average sunshine days in December: 20.6 days

The month with the most sunshine days is August (28 days).
The month with the least sunshine days is November (15.6 days).

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Average UV index in December
Cacilhas, Portugal

Average UV index in December - Cacilhas, Portugal
  • Average UV index in December: 4

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in December
Cacilhas, Portugal

Average cloud cover in December - Cacilhas, Portugal
  • Average cloud cover in December: 34

The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in December
Cacilhas, Portugal

Average visibility in December - Cacilhas, Portugal
  • Average visibility in December: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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Cacilhas, Portugal

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