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Weather in Cascais for December 2026

Your guide to Cascais weather in December - trends and predictions

    Temperatures

  • In general, the average temperature in Cascais at the beginning of December is 16.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 14.7 °C by the end of December.

    • Rain 🌧️

  • Cascais experiences moderate rainfall in December, with an average of 9 rainy days and a total precipitation of 66 mm.

    • More

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

  • ✨ Is December a good time to visit Cascais? – Ask the AI Weatherman

Average dry days
22
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
15°/12°
Temperatures
Average wind speed
27 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Cascais Weather December

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

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
 16° /13° 0.9 mm 2.2
2 Dec. Light rain
Light rain
 16° /13° 3.3 mm 2.2
3 Dec. Patchy rain possible
Patchy rain possible
 16° /13° 0.9 mm 2.2
4 Dec. Light rain
Light rain
 16° /14° 2.5 mm 2.1
5 Dec. Light rain
Light rain
 16° /13° 3.2 mm 2.1
6 Dec. Patchy rain possible
Patchy rain possible
 16° /13° 0.1 mm 2.1
7 Dec. Light rain shower
Light rain shower
 17° /14° 2.1 mm 2.1
8 Dec. Patchy rain possible
Patchy rain possible
 15° /14° 0.1 mm 2.1
9 Dec. Light rain
Light rain
 16° /13° 8.4 mm 2.1
10 Dec. Patchy rain possible
Patchy rain possible
 15° /12° 0.2 mm 2
11 Dec. Patchy rain possible
Patchy rain possible
 15° /11° 0.4 mm 2
12 Dec. Light rain
Light rain
 15° /12° 9.2 mm 2
13 Dec. Light rain
Light rain
 15° /11° 2.9 mm 2
14 Dec. Patchy rain possible
Patchy rain possible
 15° /12° 1.7 mm 2
15 Dec. Light rain
Light rain
 15° /11° 3.6 mm 2
16 Dec. Light rain
Light rain
 15° /10° 3.9 mm 2
17 Dec. Sunny
Sunny
 15° /11° 0 mm 2
18 Dec. Patchy rain possible
Patchy rain possible
 15° /12° 1.3 mm 2
19 Dec. Light rain
Light rain
 15° /12° 4.1 mm 2
20 Dec. Patchy rain possible
Patchy rain possible
 14° /12° 1.3 mm 2
21 Dec. Light rain
Light rain
 14° /10° 2.6 mm 2
22 Dec. Patchy rain possible
Patchy rain possible
 16° /12° 1.2 mm 2
23 Dec. Sunny
Sunny
 16° /12° 0.8 mm 2
24 Dec. Patchy rain possible
Patchy rain possible
 15° /11° 0.4 mm 2
25 Dec. Light rain
Light rain
 15° /11° 4.6 mm 2
26 Dec. Patchy rain possible
Patchy rain possible
 15° /11° 0.9 mm 2
27 Dec. Light rain
Light rain
 15° /11° 3.7 mm 2
28 Dec. Cloudy
Cloudy
 15° /11° 0.6 mm 2
29 Dec. Patchy rain possible
Patchy rain possible
 15° /12° 0.8 mm 2
30 Dec. Sunny
Sunny
 15° /11° 0.1 mm 2
31 Dec. Sunny
Sunny
 14° /11° 0.3 mm 2
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°15°/12°15°/11°
Rainfall90 mm66 mm110 mm
Wind26.9 km/h27 km/h30.9 km/h
Humidity75%73%76%
Rainy days11 days9 days14 days
Dry days19 days22 days17 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?
During December, expect a variety of temperatures with highs around 15° and lows near 12°, suitable for diverse activities and preferences.

How much rainfall should be expected in Cascais during December?
Moderate rainfall is anticipated in Cascais during December, with a total of 66 mm spread over approximately 9 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Cascais during December?
The average wind speed in Cascais during December is 27 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 15.4 °C. At the beginning of December temperatures are around 15.3 °C; by the end of the month they stay fairly steady and reach 15.6 °C.

What is the water temperature in Cascais in December?
The average water temperature in Cascais in December is 15.4 °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.

December rainfall patterns in Cascais

Explore the daily rainfall trends and prepare for Cascaiss December weather 💧
Typically, Cascais has 9 rainy days in December with a total of 66 mm of rainfall.

What to pack to Cascais in December?

🌦️ Mild · highs around 15 °C, frequent showers

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.

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🧥 Clothing

👟 Footwear

🎒 Accessories

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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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