May 20 is generally a great time to visit Piran. While there is a slight chance of rain (28%), showers are usually brief. Expect comfortable 21°C weather. Piran is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Piran
Currency
EUR
€ Euro
Language
Slovene
Driving
Right side
Safety
Very High Safety
GPI: 1.316
Piran Weather Forecast for May 20
"Mild & Comfortable. Expect average highs of 20.7°C. 28% chance of rain."
What to Wear in Piran in May
Based on historical data for May 20, Piran typically experiences temperatures between 14.7°C and 20.7°C. We recommend packing light jacket, long pants to stay comfortable. With a 28% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Piran
Smart Suitcase
- Light Jacket
- Long Pants
Average High
20.7°C
Daytime Peak
Average Low
14.7°C
Nighttime Low
Feels Like
20.8°C
☀️ Feels accurate
Rain Chance
28%
Avg 2.3mm if it rains
Cloud Cover
49%
Overcast
Pressure
1014.4 hPa
Medium volatility
Piran Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 94% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
04:00 - 10:00
16:00 - 19:00
Type I-II
🔴 15 min to burn
Type III-IV
🟡 23 min to burn
Type V-VI
🟢 38 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
15.9°C
Pleasant
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 Slovenia
Flight Traffic
High
84/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~27
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Piran
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:31
☀️ Noon
12:03
🌇 Sunset
19:35
⏱️ Daylight
15h 4m
Wind Speed
15.5 km/h
Gentle breeze
Sunshine
11.8 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Piran
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Piran
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
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, Piran on May 20 averages 20.7°C with a 28% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Piran Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
May 27
22°C • 19% rain
Score
99
May 26
21.9°C • 21% rain
Score
98
May 24
21.4°C • 25% rain
Score
97
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 20) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Piran Worth Visiting on May 20?
Planning a trip to Piran on May 20? 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 20.7°C with a 28% historical precipitation risk.
✈️ Travel Logistics: Approximately 27 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Slovenia, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 18.1°C (refreshing tonic). Wave conditions are generally lake-like with heights around 0.3m.
📊 Historical Extremes: The hottest May 20 recorded in the last 30 years saw temperatures hit 24.6°C in 2018, while the coldest dropped to 10.1°C in 2021.