May 15 is statistically one of the best days of the year in Lisbon. With minimal rain risk (8%) and pleasant highs of 21°C, it's ideal for outdoor adventures. Lower tourist interest in Lisbon right now translates to better deals and a more local feel.
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Lisbon Weather Forecast for May 15
"Mild & Comfortable. Expect average highs of 21.4°C. 8% chance of rain."
What to Wear in Lisbon in May
Based on historical data for May 15, Lisbon typically experiences temperatures between 14.3°C and 21.4°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (8% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Lisbon
Smart Suitcase
- Light Jacket
- Long Pants
Average High
21.4°C
Daytime Peak
Average Low
14.3°C
Nighttime Low
Feels Like
21.6°C
☀️ Feels accurate
Rain Chance
8%
Avg 0.5mm if it rains
Cloud Cover
45%
Overcast
Pressure
1016.8 hPa
Medium volatility
Lisbon Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 92% 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 - 19:00
Type I-II
🔴 13 min to burn
Type III-IV
🟡 20 min to burn
Type V-VI
🟢 33 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.1°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
Quiet
27/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~337
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Lisbon
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:26
☀️ Noon
12:34
🌇 Sunset
19:42
⏱️ Daylight
14h 16m
Wind Speed
23.2 km/h
Moderate wind
Sunshine
12.0 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Lisbon
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Lisbon
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
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Lisbon on May 15 averages 21.4°C with a 8% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Lisbon Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (May 15) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Lisbon Worth Visiting on May 15?
Planning a trip to Lisbon on May 15? 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 21.4°C with a 8% historical precipitation risk.
✈️ Travel Logistics: Approximately 337 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 6 vaccinations are recommended for Portugal, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 17.7°C (refreshing tonic). Wave conditions are generally fun waves with heights around 1.01m.
📊 Historical Extremes: The hottest May 15 recorded in the last 30 years saw temperatures hit 27.3°C in 2019, while the coldest dropped to 12.7°C in 2024.