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Weather in Sintra for December 2025

Your guide to Sintra weather in December - trends and predictions

    Official Weather Alert ⚠️

  • Orange Maritime Agitation Warning - See hour by hour.

    • Temperatures

  • Until now, December 2025 in Sintra is slightly cooler than the historical average by -1 °C.

  • Expect cooler weather in the next days in Sintra with the forecast suggesting a temperature of 12.7 °C, lower than the historical average.

  • In general, the average temperature in Sintra at the beginning of December is 16.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.6 °C by the end of December.

    • Rain 🌧️

  • Sintra experiences moderate rainfall in December, with an average of 9 rainy days and a total precipitation of 31.8 mm.

    • More

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

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

Average dry days
22
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/10°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
71 %
Avg humidity

Sintra Weather December

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

Temperatures trend during December in Sintra

See the weather trend as well as the moving average line

December weather in Sintra day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
1 Dec. Patchy rain possible
Patchy rain possible
 17° /11° 0.5 mm 4
2 Dec. Patchy rain possible
Patchy rain possible
 17° /11° 3.1 mm 4
3 Dec. Patchy rain possible
Patchy rain possible
 16° /10° 1 mm 4
4 Dec. Patchy rain possible
Patchy rain possible
 17° /12° 3.2 mm 4
5 Dec. Light rain
Light rain
 16° /11° 2.3 mm 4
6 Dec. Overcast
Overcast
 17° /11° 0 mm 4
7 Dec. Light rain shower
Light rain shower
 17° /12° 1.9 mm 4
8 Dec. Patchy rain possible
Patchy rain possible
 16° /11° 0.1 mm 4
9 Dec. Patchy rain possible
Patchy rain possible
 16° /11° 6.5 mm 4
10 Dec. Partly cloudy
Partly cloudy
 16° /10° 0 mm 5
11 Dec. Mist
Mist
 15° /9° 0.2 mm 3
12 Dec. Patchy rain possible
Patchy rain possible
 15° /10° 9.1 mm 4
13 Dec. Patchy rain possible
Patchy rain possible
 15° /9° 3.1 mm 4
14 Dec. Sunny
Sunny
 15° /9° 0.6 mm 4
15 Dec. Partly cloudy
Partly cloudy
 14° /8° 3.9 mm 4
16 Dec. Moderate rain
Moderate rain
 13° /10° 13 mm 0.3
17 Dec. Sunny
Sunny
 15° /10° 0 mm 0.3
18 Dec. Partly cloudy
Partly cloudy
 15° /10° 0 mm 0.3
19 Dec. Moderate rain
Moderate rain
 13° /11° 13.6 mm 0.3
20 Dec. Patchy rain possible
Patchy rain possible
 13° /11° 0.5 mm 0.2
21 Dec. Patchy rain possible
Patchy rain possible
 12° /9° 0.5 mm 3
22 Dec. Patchy rain possible
Patchy rain possible
 13° /8° 0.3 mm 3
23 Dec. Patchy rain possible
Patchy rain possible
 15° /11° 0.2 mm 3
24 Dec. Partly cloudy
Partly cloudy
 12° /9° 0.1 mm 4
25 Dec. Sunny
Sunny
 14° /8° 0 mm 3
26 Dec. Partly cloudy
Partly cloudy
 13° /8° 0 mm 3
27 Dec. Partly cloudy
Partly cloudy
 10° /6° 0 mm 3
28 Dec. Patchy rain possible
Patchy rain possible
 7° /4° 0.1 mm 2
29 Dec. Patchy rain possible
Patchy rain possible
 13° /6° 0.2 mm 2
30 Dec. Overcast
Overcast
 16° /10° 0 mm 4
31 Dec. Patchy rain possible
Patchy rain possible
 15° /10° 0.2 mm 4
Next
Important Notice
Our weather forecast for Sintra 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 Sintra forecast closer to your planned date for the most up-to-date weather information.
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Sintra weather in December vs November vs January

Compare December weather in Sintra 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
Temperatures19°/13°16°/10°15°/9°
Rainfall56 mm32 mm89 mm
Wind17.8 km/h16.9 km/h19.6 km/h
Humidity72%71%76%
Rainy days12 days9 days22 days
Dry days18 days22 days9 days

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

Sintra in December - FAQ

What are the expected maximum and minimum temperatures in Sintra during December?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sintra during December?
In December, Sintra can expect light to moderate rainfall, totaling 31.8 mm across approximately 9 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Sintra during December?
The average wind speed in Sintra during December is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Sintra in December?

As you prepare for your trip to Sintra 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 Sintra, 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 Sintra

Explore the daily rainfall trends and prepare for Sintras December weather 💧
Typically, Sintra has 9 rainy days in December with a total of 31.8 mm of rainfall.
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Get accurate weather forecasts for Sintra, located at latitude 38.767 and longitude -9.298. Stay updated with localized weather information tailored for Sintra.

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