December 20 is generally a great time to visit Lisbon. While there is a slight chance of rain (25%), showers are usually brief. Expect comfortable 15°C weather. Moderate travel demand makes this an excellent time for a balanced Lisbon experience.
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Essential Travel Info for Lisbon
Currency
EUR
€ Euro
Language
Portuguese
Driving
Right side
Connect
All of Lisbon has 4G from all Portuguese...
Safety
Very High Safety
GPI: 1.301
Lisbon Weather Forecast for December 20
"Mild & Comfortable. Expect average highs of 15°C. 25% chance of rain."
What to Wear in Lisbon in December
Based on historical data for December 20, Lisbon typically experiences temperatures between 10.2°C and 15°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 Lisbon
Smart Suitcase
- Light Jacket
- Long Pants
Average High
15°C
Daytime Peak
Average Low
10.2°C
Nighttime Low
Feels Like
15°C
🌤️ Feels accurate
Rain Chance
25%
Avg 2.7mm if it rains
Cloud Cover
55%
Overcast
Pressure
1022.1 hPa
High volatility
Lisbon Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% 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
12.1°C
Pleasant
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Portugal
Flight Traffic
Moderate
57/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~720
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Lisbon
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:51
☀️ Noon
12:35
🌇 Sunset
17:18
⏱️ Daylight
9h 27m
Wind Speed
21.8 km/h
Moderate wind
Sunshine
6.7 hrs
Direct Sun (Cloud-free)
Humidity
83%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Lisbon
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Lisbon
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Rapid pressure changes detected. High risk for meteosensitive people.
Weather unlikely to affect joint pain.
Fish are active due to pressure changes.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Lisbon on December 20 averages 15°C with a 25% precipitation probability. Wedding/Outdoor Event Score: 95/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Lisbon Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
December 13
14.9°C • 25% rain
Score
96
December 21
15°C • 25% rain
Score
96
December 22
14.9°C • 27% rain
Score
96
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 20) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Lisbon Worth Visiting on December 20?
Planning a trip to Lisbon on December 20? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 15°C with a 25% historical precipitation risk.
✈️ Travel Logistics: Approximately 720 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 6 vaccinations are recommended for Portugal, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 15.5°C (polar plunge). Wave conditions are generally surfers only with heights around 1.55m.
📊 Historical Extremes: The hottest December 20 recorded in the last 30 years saw temperatures hit 17.8°C in 2022, while the coldest dropped to 6.5°C in 2017.