September 13 is generally a great time to visit Porto. While there is a slight chance of rain (17%), showers are usually brief. Expect comfortable 24°C weather. As it's peak season for Porto, we recommend booking your stay well in advance to secure the best rates.
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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 September 13
"Mild & Comfortable. Expect average highs of 24.3°C. 17% chance of rain."
What to Wear in Porto in September
Based on historical data for September 13, Porto typically experiences temperatures between 16.3°C and 24.3°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (17% 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
24.3°C
Daytime Peak
Average Low
16.3°C
Nighttime Low
Feels Like
25°C
☀️ Feels accurate
Rain Chance
17%
Avg 1.1mm if it rains
Cloud Cover
44%
Overcast
Pressure
1016.5 hPa
Medium volatility
Porto Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 82% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 25 min to burn
Type III-IV
🟡 38 min to burn
Type V-VI
🟢 63 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19.6°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
❄️ Cold Water Hazard
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
~243
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Porto
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:14
☀️ Noon
12:31
🌇 Sunset
18:49
⏱️ Daylight
12h 35m
Wind Speed
17 km/h
Gentle breeze
Sunshine
10.2 hrs
Direct Sun (Cloud-free)
Humidity
75%
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
🟡 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 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 September 13 averages 24.3°C with a 17% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— 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
Better Alternatives Nearby
Consider these dates within ±7 days
September 9
24.1°C • 13% rain
Score
100
September 10
24.2°C • 13% rain
Score
100
September 11
24.5°C • 12% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 13) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Porto Worth Visiting on September 13?
Planning a trip to Porto on September 13? 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 24.3°C with a 17% historical precipitation risk.
✈️ Travel Logistics: Approximately 243 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 17.2°C (refreshing tonic). Wave conditions are generally surfers only with heights around 1.55m.
📊 Historical Extremes: The hottest September 13 recorded in the last 30 years saw temperatures hit 31.8°C in 2019, while the coldest dropped to 13.4°C in 2025.