January 21 is generally a great time to visit Porto. While there is a slight chance of rain (33%), showers are usually brief. Expect comfortable 13°C weather. You'll enjoy Porto with reasonable crowd levels and competitive accommodation options.
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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 January 21
"Mild & Comfortable. Expect average highs of 13.1°C. 33% chance of rain."
What to Wear in Porto in January
Based on historical data for January 21, Porto typically experiences temperatures between 6.8°C and 13.1°C. We recommend packing heavy coat, scarf, gloves along with other layers to stay comfortable. With a 33% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Porto
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
- Umbrella
Average High
13.1°C
Daytime Peak
Average Low
6.8°C
Nighttime Low
Feels Like
12.4°C
🌤️ Feels accurate
Rain Chance
33%
Avg 3.6mm if it rains
Cloud Cover
56%
Overcast
Pressure
1020.7 hPa
High volatility
Porto 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
Type I-II
🔴 200 min to burn
Type III-IV
🟡 300 min to burn
Type V-VI
🟢 500 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
9.9°C
Dry air
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
41/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~99
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Porto
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
08:55
☀️ Noon
13:46
🌇 Sunset
18:37
⏱️ Daylight
9h 42m
Wind Speed
19.1 km/h
Gentle breeze
Sunshine
6.1 hrs
Direct Sun (Cloud-free)
Humidity
81%
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
⛅ Good
Tourist Crowds
🟢 Moderate
Price Level
💰💰 Moderate
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
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Porto on January 21 averages 13.1°C with a 33% precipitation probability. Wedding/Outdoor Event Score: 79/100."
— 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
January 26
13.6°C • 30% rain
Score
84
January 25
13.6°C • 29% rain
Score
83
January 22
13.3°C • 29% rain
Score
82
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (January 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Porto Worth Visiting on January 21?
Planning a trip to Porto on January 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 13.1°C with a 33% historical precipitation risk.
✈️ Travel Logistics: Approximately 99 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 13.7°C (polar plunge). Wave conditions are generally surfers only with heights around 2.25m.
📊 Historical Extremes: The hottest January 21 recorded in the last 30 years saw temperatures hit 16.7°C in 2025, while the coldest dropped to 3.8°C in 2017.