Weather in Siena for December 2026
In general, the average temperature in Siena at the beginning of December is 10.6 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 10.1 °C by the end of December.
Siena experiences moderate rainfall in December, with an average of 8 rainy days and a total precipitation of 58.2 mm.
Is December a good time to visit Siena? check out the best time to travel to Siena page.
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Siena Weather December
Temperatures trend during December in Siena
December weather in Siena day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Dec. |  Sunny | 13° /7° | 0.4 mm | 1.5 | |
| 2 Dec. |  Light rain | 13° /4° | 3.1 mm | 1.5 | |
| 3 Dec. |  Partly cloudy | 10° /3° | 0 mm | 1.5 | |
| 4 Dec. |  Patchy rain possible | 9° /3° | 0.9 mm | 1.4 | |
| 5 Dec. |  Moderate rain | 10° /3° | 8.1 mm | 1.4 | |
| 6 Dec. |  Overcast | 9° /2° | 0 mm | 1.4 | |
| 7 Dec. | Sunny | 10° /2° | 0.3 mm | 1.4 | |
| 8 Dec. | Light rain | 9° /3° | 5 mm | 1.4 | |
| 9 Dec. | Light rain | 9° /3° | 5.8 mm | 1.4 | |
| 10 Dec. | Patchy rain possible | 11° /4° | 0.2 mm | 1.4 | |
| 11 Dec. | Patchy rain possible | 10° /4° | 0.2 mm | 1.4 | |
| 12 Dec. | Sunny | 12° /5° | 0.3 mm | 1.4 | |
| 13 Dec. | Light rain shower | 11° /4° | 1.5 mm | 1.3 | |
| 14 Dec. | Light rain shower | 11° /4° | 1.6 mm | 1.3 | |
| 15 Dec. | Sunny | 11° /3° | 0.6 mm | 1.3 | |
| 16 Dec. | Sunny | 10° /4° | 0.7 mm | 1.3 | |
| 17 Dec. | Patchy rain possible | 11° /4° | 1.8 mm | 1.3 | |
| 18 Dec. | Patchy rain possible | 12° /6° | 0.2 mm | 1.3 | |
| 19 Dec. | Patchy rain possible | 12° /6° | 1.2 mm | 1.3 | |
| 20 Dec. | Moderate rain | 12° /4° | 10.1 mm | 1.3 | |
| 21 Dec. | Partly cloudy | 10° /3° | 0 mm | 1.3 | |
| 22 Dec. | Patchy rain possible | 11° /4° | 1.7 mm | 1.3 | |
| 23 Dec. | Light rain | 9° /4° | 3.8 mm | 1.3 | |
| 24 Dec. | Light rain | 10° /3° | 6.1 mm | 1.3 | |
| 25 Dec. | Light rain | 10° /4° | 3.6 mm | 1.3 | |
| 26 Dec. | Partly cloudy | 10° /2° | 0 mm | 1.3 | |
| 27 Dec. | Sunny | 10° /2° | 0 mm | 1.3 | |
| 28 Dec. | Overcast | 10° /3° | 0 mm | 1.3 | |
| 29 Dec. | Sunny | 11° /4° | 0.2 mm | 1.3 | |
| 30 Dec. | Patchy rain possible | 10° /4° | 0.7 mm | 1.4 | |
| 31 Dec. | Patchy rain possible | 10° /3° | 0.2 mm | 1.4 | |
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Siena weather in December vs November vs January
| November | December | January | |
|---|---|---|---|
| Weather | Patchy rain possible | Sunny | Patchy rain possible |
| Temperatures | 14°/6° | 10°/4° | 10°/3° |
| Rainfall | 59 mm | 58 mm | 79 mm |
| Wind | 14.5 km/h | 10 km/h | 14 km/h |
| Humidity | 77% | 80% | 81% |
| Rainy days | 10 days | 8 days | 9 days |
| Dry days | 20 days | 23 days | 22 days |
Planning a trip to Siena? Discover the best time to visit
Siena in December - FAQ
What are the expected maximum and minimum temperatures in Siena during December?
How much rainfall should be expected in Siena during December?
What are the typical wind conditions in Siena during December?
December rainfall patterns in Siena
What to pack to Siena in December?
Cold & raw · highs around 10 °C, frequent showers
As you prepare for your trip to Siena in December, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Siena, during December, is comfortable and enjoyable, regardless of the weather conditions.
🧥 Clothing
👟 Footwear
🎒 Accessories
Where is Siena?Get accurate weather forecasts for Siena, located at latitude 43.318 and longitude 11.331. Stay updated with localized weather information tailored for Siena.