April 21 is generally a great time to visit Siena. While there is a slight chance of rain (28%), showers are usually brief. Expect comfortable 18°C weather. As it's peak season for Siena, we recommend booking your stay well in advance to secure the best rates. Note: April 21 is Easter Monday in Siena, so expect special events, closures, and festive atmosphere.
View the full calendar
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 April 21
"Mild & Comfortable. Expect average highs of 17.8°C. 28% chance of rain."
What to Wear in Siena in April
Based on historical data for April 21, Siena typically experiences temperatures between 7.1°C and 17.8°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 Siena
Smart Suitcase
- Light Jacket
- Long Pants
Average High
17.8°C
Daytime Peak
Average Low
7.1°C
Nighttime Low
Feels Like
17.8°C
🌤️ Feels accurate
Rain Chance
28%
Avg 1.7mm if it rains
Cloud Cover
56%
Overcast
Pressure
1013.6 hPa
Medium volatility
Siena 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 recommended
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 20 min to burn
Type III-IV
🟡 30 min to burn
Type V-VI
🟢 50 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
12.7°C
Pleasant
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Holiday
Easter Monday
Flight Traffic
High
84/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~54
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Siena
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:24
☀️ Noon
12:14
🌇 Sunset
19:04
⏱️ Daylight
13h 40m
Wind Speed
13.4 km/h
Gentle breeze
Sunshine
10.3 hrs
Direct Sun (Cloud-free)
Humidity
72%
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
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
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 April 21 averages 17.8°C with a 28% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— 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
April 28
19°C • 30% rain
Score
90
April 24
18.4°C • 29% rain
Score
89
April 27
18.9°C • 31% rain
Score
89
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (April 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Siena Worth Visiting on April 21?
Planning a trip to Siena on April 21? 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 17.8°C with a 28% historical precipitation risk.
🎉 Local Event: The date coincides with Easter Monday, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 54 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 April 21 recorded in the last 30 years saw temperatures hit 25°C in 2018, while the coldest dropped to 3.3°C in 2021.