June 21 is statistically one of the best days of the year in Porto. With minimal rain risk (14%) and pleasant highs of 23°C, it's ideal for outdoor adventures. Porto is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Porto
Currency
EUR
€ Euro
Language
Portuguese
Driving
Right side
Connect
Porto has 4G from all Portuguese carrier...
Safety
Very High Safety
GPI: 1.301
Porto Weather Forecast for June 21
"Mild & Comfortable. Expect average highs of 23°C. 14% chance of rain."
What to Wear in Porto in June
Based on historical data for June 21, Porto typically experiences temperatures between 15.2°C and 23°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (14% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Porto
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
23°C
Daytime Peak
Average Low
15.2°C
Nighttime Low
Feels Like
23.5°C
☀️ Feels accurate
Rain Chance
14%
Avg 0.4mm if it rains
Cloud Cover
39%
Overcast
Pressure
1017.7 hPa
Low volatility
Porto Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 93% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30+ required, seek shade
05:00 - 10:00
16:00 - 20:00
Type I-II
🔴 12 min to burn
Type III-IV
🟡 18 min to burn
Type V-VI
🟢 30 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19°C
Noticeable
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
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Portugal
Flight Traffic
High
98/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~239
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Porto
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:03
☀️ Noon
12:37
🌇 Sunset
20:11
⏱️ Daylight
15h 8m
Wind Speed
19.4 km/h
Gentle breeze
Sunshine
13.0 hrs
Direct Sun (Cloud-free)
Humidity
78%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Porto
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 Porto
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 excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Porto on June 21 averages 23°C with a 14% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Porto Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (June 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Porto Worth Visiting on June 21?
Planning a trip to Porto on June 21? 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 23°C with a 14% historical precipitation risk.
✈️ Travel Logistics: Approximately 239 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 6 vaccinations are recommended for Portugal, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 18.4°C (refreshing tonic). Wave conditions are generally fun waves with heights around 1.17m.
📊 Historical Extremes: The hottest June 21 recorded in the last 30 years saw temperatures hit 28.5°C in 2016, while the coldest dropped to 12.2°C in 2024.