December · Italy
Best time to visit Siena in December Weather, crowds & prices
Weather in Siena in December
Average temperature 7°C, 84 mm of rain, about 19 days with 6+ hours of sunshine and 85% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
6.0/10
Ranked #12 of 12 months
- Avg temp
- 7°C
- Rainfall
- 84 mm
- Humidity
- 85%
- Days with 6h+ sun
- 19
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
December in Siena scores 6.0/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 7°C, 84 mm of rain, and roughly 19 days with 6+ hours of sunshine this month.
Siena's medieval center revolves around Piazza del Campo, framed by the Palazzo Pubblico and the Torre del Mangia.
December in Siena — middling scores, decent value
December averages 7°C (45°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 84 mm, so plan one flexible day in three; you still get about 19 days with 6+ hours of sunshine and 9 hours of daylight.
It scores 6/10 here, 12th of 12 months, against 9.3/10 in the destination's best month.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
Figure on low-season pricing, with crowds are light for this destination.
Flexible dates? June scores 3.3 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Siena in December?
- In December, Siena averages 7°C, 84 mm of rain, and about 19 days with 6+ hours of sunshine. Its climate-comfort score is 6.0/10.
- Is December a good time to visit Siena?
- December earns a 6.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Siena in December?
- Expect about 84 mm of rain in December. Average humidity is 85% and there are about 19 days with 6+ hours of sunshine.
Curated in Siena
Tickets & experiences
Things to do in Siena
Siena, Italy. Live activities and tours from GetYourGuide, matched to this destination.