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Weather in Cascais for December 2025

Your guide to Cascais weather in December - trends and predictions

    Official Weather Alert ⚠️

  • Orange Maritime Agitation Warning - See hour by hour.

    • Temperatures

  • Until now, December 2025 in Cascais has been nearly identical to the historical average, with a temperature of 15.4 °C (showing only a slight deviation of -0.5 °C).

  • Expect cooler weather in the next days in Cascais with the forecast suggesting a temperature of 14.3 °C, lower than the historical average.

  • In general, the average temperature in Cascais at the beginning of December is 16.4 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 14.4 °C by the end of December.

    • Rain 🌧️

  • Cascais experiences moderate rainfall in December, with an average of 10 rainy days and a total precipitation of 30.4 mm.

    • More

  • Is December a good time to visit Cascais? check out the best time to travel to Cascais page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
21
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/12°
Temperatures
Average wind speed
25 km/h
Avg max wind
Average humidity
71 %
Avg humidity

Cascais Weather December

Move between months or click on a day
November
January
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
17°
2
Patchy rain possible
16°
3
Patchy rain possible
16°
4
Patchy rain possible
17°
5
Light rain
16°
6
Patchy rain possible
16°
7
Light rain shower
17°
8
Patchy rain possible
16°
9
Patchy rain possible
16°
10
Patchy rain possible
15°
11
Patchy rain possible
15°
12
Patchy rain possible
15°
13
Patchy rain possible
16°
14
Sunny
15°
15
Cloudy
15°
16
Weather Alert Patchy rain possible
14°
17
Weather Alert Sunny
15°
18
Patchy rain possible
16°
19
Heavy rain
14°
20
Patchy rain possible
14°
21
Patchy rain possible
13°
22
Patchy rain possible
15°
23
Patchy rain possible
15°
24
Patchy rain possible
14°
25
Patchy rain possible
14°
26
Patchy rain possible
14°
27
Moderate rain
14°
28
Patchy rain possible
14°
29
Patchy rain possible
14°
30
Cloudy
16°
31
Patchy rain possible
15°

Temperatures trend during December in Cascais

See the weather trend as well as the moving average line

December weather in Cascais day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
1 Dec. Light rain shower
Light rain shower
 17° /13° 0.9 mm 4
2 Dec. Patchy rain possible
Patchy rain possible
 16° /12° 3.3 mm 4
3 Dec. Patchy rain possible
Patchy rain possible
 16° /13° 0.9 mm 4
4 Dec. Patchy rain possible
Patchy rain possible
 17° /14° 2.5 mm 4
5 Dec. Light rain
Light rain
 16° /13° 3.2 mm 4
6 Dec. Patchy rain possible
Patchy rain possible
 16° /13° 0.1 mm 4
7 Dec. Light rain shower
Light rain shower
 17° /14° 2.1 mm 4
8 Dec. Patchy rain possible
Patchy rain possible
 16° /13° 0.1 mm 4
9 Dec. Patchy rain possible
Patchy rain possible
 16° /13° 8.4 mm 4
10 Dec. Patchy rain possible
Patchy rain possible
 15° /12° 0.2 mm 4
11 Dec. Patchy rain possible
Patchy rain possible
 15° /11° 0.4 mm 4
12 Dec. Patchy rain possible
Patchy rain possible
 15° /11° 9.2 mm 4
13 Dec. Patchy rain possible
Patchy rain possible
 16° /11° 2.9 mm 4
14 Dec. Sunny
Sunny
 15° /11° 1.7 mm 4
15 Dec. Cloudy
Cloudy
 15° /10° 0 mm 4
16 Dec. Patchy rain possible
Patchy rain possible
 14° /12° 4 mm 0.3
17 Dec. Sunny
Sunny
 15° /12° 0 mm 0.3
18 Dec. Patchy rain possible
Patchy rain possible
 16° /12° 3.6 mm 0.3
19 Dec. Heavy rain
Heavy rain
 14° /13° 26.4 mm 0.3
20 Dec. Patchy rain possible
Patchy rain possible
 14° /13° 0.4 mm 0.3
21 Dec. Patchy rain possible
Patchy rain possible
 13° /12° 0.6 mm 3
22 Dec. Patchy rain possible
Patchy rain possible
 15° /12° 0.7 mm 3
23 Dec. Patchy rain possible
Patchy rain possible
 15° /12° 1.7 mm 3
24 Dec. Patchy rain possible
Patchy rain possible
 14° /11° 0.4 mm 3
25 Dec. Patchy rain possible
Patchy rain possible
 14° /12° 0.2 mm 3
26 Dec. Patchy rain possible
Patchy rain possible
 14° /11° 0.7 mm 3
27 Dec. Moderate rain
Moderate rain
 14° /13° 11 mm 3
28 Dec. Patchy rain possible
Patchy rain possible
 14° /12° 1.8 mm 3
29 Dec. Patchy rain possible
Patchy rain possible
 14° /10° 0.4 mm 3
30 Dec. Cloudy
Cloudy
 16° /11° 0.1 mm 4
31 Dec. Patchy rain possible
Patchy rain possible
 15° /11° 0.4 mm 4
Next
Important Notice
Our weather forecast for Cascais in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cascais forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Cascais weather in December vs November vs January

Compare December weather in Cascais with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
NovemberDecemberJanuary
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures18°/15°16°/12°15°/12°
Rainfall68 mm30 mm88 mm
Wind25 km/h25.1 km/h27.6 km/h
Humidity75%71%75%
Rainy days13 days10 days21 days
Dry days17 days21 days10 days

Planning a trip to Cascais? Discover the best time to visit

Cascais in December - FAQ

What are the expected maximum and minimum temperatures in Cascais during December?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Cascais during December?
In December, Cascais can expect light to moderate rainfall, totaling 30.4 mm across approximately 10 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Cascais during December?
The average wind speed in Cascais during December is 25 km/h, suggesting breezy to windy conditions, depending on your activities.

Cascais water temperatures in December

The average water temperature of the Atlantic Ocean near Cascais in December is 15.3 °C. Temperatures remain fairly consistent throughout the month.

What is the water temperature in Cascais in December?
The average water temperature in Cascais in December is 15.3 °C.
Can you swim in Cascais in December?
Brisk: quick dips and active swimming are fine, but pack a 2–3 mm spring suit if you plan longer sessions or early-morning outings.

What to pack to Cascais in December?

As you prepare for your trip to Cascais 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 Cascais, 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 Cascais

Explore the daily rainfall trends and prepare for Cascaiss December weather 💧
Typically, Cascais has 10 rainy days in December with a total of 30.4 mm of rainfall.

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Get accurate weather forecasts for Cascais, located at latitude 38.697 and longitude -9.421. Stay updated with localized weather information tailored for Cascais.

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