Siena Weather in December
Siena in December sees low temperatures, with highs around 11°C (52°F) and overnight lows of 3°C (37°F). Rainfall is fairly high at around 84 mm (3.3 in) on average, so pack waterproofs just in case.
Rainfall in Siena in December
Typically, you can expect about 13 days of rain this month, with 84 mm (3.3 in) on average. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Siena in December
Daytime highs in Siena in December reach 11°C (52°F), with nights around 3°C (37°F). December is a notable month of the winter season. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. With lows around 3°C (37°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Siena in December
The area experiences a moderate amount of sunshine, with approximately 100 hours of sunlight expected. This means a decent mix of sun and overcast.If you prefer dry days with pleasant temperatures, May, June and September typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Italy, check out our Siena's climate page.
Siena Temperature in December
Min Temperature
3°C (37°F)
Max Temperature
11°C (52°F)
Chance of Rain
43%
Precipitation
84 mm (3.3 in)
Rainy days
13 days
Sunshine
100 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Siena typically stay consistent throughout December, with daily highs averaging around 11°C (52°F). Nights are cold, with lows typically ranging from 3°C (37°F) to 5°C (41°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Siena in December
Browse day-by-day weather records for Siena spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Siena historical weather extremes in December
Based on weather observations in Siena between 1976 and 2025, these are the recorded extremes during December.
- On December 1, 2023, temperatures climbed to 21°C (70°F), marking the warmest December day on record.
- The lowest daytime temperature in December was 0°C (32°F), recorded on December 29, 1996.
- Nighttime temperatures dropped to -10°C (14°F) on December 30, 1996, marking the coldest December night on record.
Best Places in Italy in December
Find out more about the weather in Italy and which places have the best travel conditions in this month. See all of Italy in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Siena in December
The weather can be unpredictable in December, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Siena in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Italy, check out our Siena's climate page.
See the full Siena climate overview or explore weather in Italy.
