June 18 is statistically one of the best days of the year in Sintra. With minimal rain risk (11%) and pleasant highs of 22°C, it's ideal for outdoor adventures. 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 June 18
"Mild & Comfortable. Expect average highs of 21.9°C. 11% chance of rain."
What to Wear in Sintra in June
Based on historical data for June 18, Sintra typically experiences temperatures between 15.9°C and 21.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (11% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Sintra
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
21.9°C
Daytime Peak
Average Low
15.9°C
Nighttime Low
Feels Like
22.2°C
☀️ Feels accurate
Rain Chance
11%
Avg 0.2mm if it rains
Cloud Cover
36%
Overcast
Pressure
1016.9 hPa
Low 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+ required, seek shade
06:00 - 10:00
16:00 - 21:00
Type I-II
🔴 11 min to burn
Type III-IV
🟡 17 min to burn
Type V-VI
🟢 28 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
17.7°C
Noticeable
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
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~343
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sintra
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:13
☀️ Noon
13:39
🌇 Sunset
21:06
⏱️ Daylight
14h 52m
Wind Speed
23.7 km/h
Moderate wind
Sunshine
12.8 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
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Travel Health & Safety in Sintra
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
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 June 18 averages 21.9°C with a 11% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— 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
Compare Other Cities
Same date (June 18) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Sintra Worth Visiting on June 18?
Planning a trip to Sintra on June 18? 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 21.9°C with a 11% historical precipitation risk.
✈️ Travel Logistics: Approximately 343 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 June 18 recorded in the last 30 years saw temperatures hit 35.5°C in 2017, while the coldest dropped to 13.4°C in 2021.