December 17 is generally a great time to visit Piran. While there is a slight chance of rain (23%), showers are usually brief. Expect comfortable 10°C weather. It's a lively time to explore Piran, with most attractions operating at full capacity.
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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 December 17
"Mild & Comfortable. Expect average highs of 9.8°C. 23% chance of snow."
What to Wear in Piran in December
Based on historical data for December 17, Piran typically experiences temperatures between 4.9°C and 9.8°C. We recommend packing heavy coat, scarf, gloves to stay comfortable. Trends suggest it will stay mostly dry (23% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Piran
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
9.8°C
Daytime Peak
Average Low
4.9°C
Nighttime Low
Feels Like
7.8°C
❄️ Slightly colder
Snow Chance
23%
Avg 1.8mm if it snows
Snowfall
0.1 cm
~23% chance
Pressure
1021.4 hPa
High volatility
Piran Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 98% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
6°C
Dry air
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Midday (11 AM - 3 PM) when warmest
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 Slovenia
Flight Traffic
Busy
66/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~21
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Piran
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:41
☀️ Noon
12:03
🌇 Sunset
16:24
⏱️ Daylight
8h 42m
Wind Speed
13.6 km/h
Gentle breeze
Sunshine
5.4 hrs
Direct Sun (Cloud-free)
Humidity
77%
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
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
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
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Piran on December 17 averages 9.8°C with a 23% precipitation probability. Wedding/Outdoor Event Score: 69/100."
— 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
December 12
10.1°C • 25% rain
Score
70
December 13
10.2°C • 24% rain
Score
70
December 14
10.2°C • 24% rain
Score
70
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 17) in other destinations
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📍 Is Piran Worth Visiting on December 17?
Planning a trip to Piran on December 17? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year offers a bracing seasonal atmosphere averaging 9.8°C with a 23% historical precipitation risk.
✈️ Travel Logistics: Approximately 21 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 13.5°C (polar plunge). Wave conditions are generally lake-like with heights around 0.27m.
📊 Historical Extremes: The hottest December 17 recorded in the last 30 years saw temperatures hit 16.5°C in 2019, while the coldest dropped to 0.8°C in 2016.