The month in detail
What to expect in December
In December, Siena sees 52°F during the day with 4.3h of sunshine per day. Expect rain on 28% of days — a light raincoat in the bag is recommended.
December ranks 12 out of 12 months in Siena. Compared to November: −7°F daytime, 5 pts fewer rainy days, −0.5h of sun per day.
This month's conditions
What it's like in December
UV index
2 · low
no protection needed
Feels like
dry air
4°
Daylight
8.8h of daylight
Air quality
good
AQI 27
Compare
Is December the right month?
The best month in Siena is June (8.7/10), 4.6 pts higher than December.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Siena
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Siena
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach trip.
Country · Italy
🗣️LanguageItalian
💶CurrencyEuro (€)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘModerate · 3/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘStable
🔥Hottest monthJuly · 90°F
❄️Coolest monthJanuary · 50°F
🌧️Rainiest month ⓘNovember · 33%
🏖️ Beach trip
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
🛂VisaSchengen · 90 days
Explore
Other destinations in December
If December doesn't convince you for this destination, compare with others.
Location
Where is Siena ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
ItalyTemperate oceanic climate with a 8.7 → 4.1 gap between best and worst month. 10 years of ERA5 data to choose by project.
43.32°N · 11.33°E
Questions
Frequently asked questions
What is the best time to visit Siena?
June is the best month with 84°F highs, 61°F lows, 9.1h of sunshine and 20.0% rainy days. The months of June & July offer comparable conditions.
How many hours of sunshine does Siena get in June?
Siena averages 9.1 sunshine hours per day in June. It is the sunniest month with a climate score of 8.4/10.
What is the rainiest month in Siena?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Siena in June?
In June, overnight lows reach 61°F, while afternoon highs average 84°F.
Is Siena good in winter?
In winter (December-February), Siena scores 4.0/10 on average — Difficult period — prefer the peak season.. The best month overall remains June with a score of 8.4/10.
When should you avoid Siena?
January is the most difficult month to visit Siena, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Do you need sun protection in Siena in December?
The average UV index reaches 2 in December in Siena (low), with about 8.8h of daylight. No protection needed.