December 4 is generally a great time to visit Sintra. While there is a slight chance of rain (25%), showers are usually brief. Expect comfortable 15°C weather. Expect a bustling atmosphere in Sintra right now—this is when the city truly comes alive with visitors.
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Essential Travel Info for Sintra
Currency
EUR
€ Euro
Language
Portuguese
Driving
Right side
Safety
Very High Safety
GPI: 1.301
Sintra Weather Forecast for December 4
"Mild & Comfortable. Expect average highs of 14.6°C. 25% chance of rain."
What to Wear in Sintra in December
Based on historical data for December 4, Sintra typically experiences temperatures between 10.1°C and 14.6°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (25% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Sintra
Smart Suitcase
- Light Jacket
- Long Pants
Average High
14.6°C
Daytime Peak
Average Low
10.1°C
Nighttime Low
Feels Like
14.4°C
🌤️ Feels accurate
Rain Chance
25%
Avg 1.3mm if it rains
Cloud Cover
51%
Overcast
Pressure
1020.4 hPa
Medium volatility
Sintra Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 88% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
11.2°C
Pleasant
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Portugal
Flight Traffic
High
87/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~297
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sintra
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
08:40
☀️ Noon
13:29
🌇 Sunset
18:17
⏱️ Daylight
9h 36m
Wind Speed
19.7 km/h
Gentle breeze
Sunshine
7.1 hrs
Direct Sun (Cloud-free)
Humidity
80%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Sintra
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Sintra
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
High pressure may reduce activity.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Sintra on December 4 averages 14.6°C with a 25% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Sintra Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
December 8
14.9°C • 29% rain
Score
95
November 28
15°C • 28% rain
Score
94
November 29
15°C • 27% rain
Score
94
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 4) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Sintra Worth Visiting on December 4?
Planning a trip to Sintra on December 4? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 14.6°C with a 25% historical precipitation risk.
✈️ Travel Logistics: Approximately 297 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 6 vaccinations are recommended for Portugal, including COVID-19.
📊 Historical Extremes: The hottest December 4 recorded in the last 30 years saw temperatures hit 17.4°C in 2024, while the coldest dropped to 3.5°C in 2017.