January 17 is generally a great time to visit Siena. While there is a slight chance of rain (23%), showers are usually brief. Expect comfortable 9°C weather. Moderate travel demand makes this an excellent time for a balanced Siena experience.
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Essential Travel Info for Siena
Currency
EUR
€ Euro
Language
Italian
+1 more
Driving
Right side
Safety
High Safety
GPI: 1.643
Siena Weather Forecast for January 17
"Mild & Comfortable. Expect average highs of 9.2°C. 23% chance of rain."
What to Wear in Siena in January
Based on historical data for January 17, Siena typically experiences temperatures between 0.9°C and 9.2°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 Siena
Smart Suitcase
- Heavy Coat
- Scarf
- Gloves
Average High
9.2°C
Daytime Peak
Average Low
0.9°C
Nighttime Low
Feels Like
7.2°C
❄️ Minor difference
Rain Chance
23%
Avg 1.2mm if it rains
Cloud Cover
57%
Overcast
Pressure
1018.2 hPa
High volatility
Siena Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
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
6.3°C
Dry air
Heat Stress
Low
No heat warning
😐 Best outdoor time:
Midday (11 AM - 3 PM) when warmest
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Italy
Flight Traffic
Moderate
52/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~33
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Siena
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:44
☀️ Noon
12:25
🌇 Sunset
17:07
⏱️ Daylight
9h 22m
Wind Speed
13 km/h
Gentle breeze
Sunshine
6.4 hrs
Direct Sun (Cloud-free)
Humidity
82%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Siena
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 Siena
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
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 acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Siena on January 17 averages 9.2°C with a 23% precipitation probability. Wedding/Outdoor Event Score: 61/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Siena Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
January 12
9°C • 13% rain
Score
67
January 13
9°C • 13% rain
Score
67
January 14
9°C • 14% rain
Score
67
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (January 17) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Siena Worth Visiting on January 17?
Planning a trip to Siena on January 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 9.2°C with a 23% historical precipitation risk.
✈️ Travel Logistics: Approximately 33 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Italy, including COVID-19.
📊 Historical Extremes: The hottest January 17 recorded in the last 30 years saw temperatures hit 13.4°C in 2024, while the coldest dropped to -3.1°C in 2016.