May 12 is generally a great time to visit Sintra. While there is a slight chance of rain (16%), showers are usually brief. Expect comfortable 18°C weather. As it's peak season for Sintra, we recommend booking your stay well in advance to secure the best rates.
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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 May 12
"Mild & Comfortable. Expect average highs of 18.3°C. 16% chance of rain."
What to Wear in Sintra in May
Based on historical data for May 12, Sintra typically experiences temperatures between 12.9°C and 18.3°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (16% 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
18.3°C
Daytime Peak
Average Low
12.9°C
Nighttime Low
Feels Like
18.3°C
🌤️ Feels accurate
Rain Chance
16%
Avg 1mm if it rains
Cloud Cover
49%
Overcast
Pressure
1016.6 hPa
Medium volatility
Sintra Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 20:00
Type I-II
🔴 14 min to burn
Type III-IV
🟡 21 min to burn
Type V-VI
🟢 35 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
14.2°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
99/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~340
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sintra
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:29
☀️ Noon
13:35
🌇 Sunset
20:40
⏱️ Daylight
14h 11m
Wind Speed
23.1 km/h
Moderate wind
Sunshine
12.0 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Sintra
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
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.
Moderate fish activity expected.
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 May 12 averages 18.3°C with a 16% 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
May 6
18.2°C • 15% rain
Score
100
May 15
18.9°C • 10% rain
Score
100
May 18
19.2°C • 9% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 12) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Sintra Worth Visiting on May 12?
Planning a trip to Sintra on May 12? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 18.3°C with a 16% historical precipitation risk.
✈️ Travel Logistics: Approximately 340 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 May 12 recorded in the last 30 years saw temperatures hit 31.4°C in 2019, while the coldest dropped to 10.1°C in 2025.