Weather in Siena for December 2025
In general, the average temperature in Siena at the beginning of December is 10.6 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 11 °C by the end of December.
With an average of 3 rainy days, Siena experiences minimal rainfall in December.
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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 | 15° /7° | 0 mm | 5 | |
| 2 Dec. |  Light rain shower | 14° /4° | 4.6 mm | 4 | |
| 3 Dec. |  Partly cloudy | 9° /2° | 0 mm | 3 | |
| 4 Dec. | Patchy rain possible | 9° /2° | 1.4 mm | 3 | |
| 5 Dec. |  Moderate rain | 9° /2° | 12.1 mm | 3 | |
| 6 Dec. | Sunny | 9° /1° | 0 mm | 3 | |
| 7 Dec. | Sunny | 9° /1° | 0.4 mm | 3 | |
| 8 Dec. | Patchy rain possible | 7° /2° | 7.5 mm | 2 | |
| 9 Dec. |  Mist | 7° /2° | 8.7 mm | 2 | |
| 10 Dec. | Patchy rain possible | 10° /3° | 0.3 mm | 3 | |
| 11 Dec. | Patchy rain possible | 9° /3° | 0.3 mm | 2 | |
| 12 Dec. | Patchy rain possible | 12° /5° | 0.5 mm | 4 | |
| 13 Dec. | Light rain shower | 10° /4° | 2.2 mm | 3 | |
| 14 Dec. | Light rain shower | 11° /4° | 2.4 mm | 3 | |
| 15 Dec. | Sunny | 11° /3° | 0.8 mm | 4 | |
| 16 Dec. | Sunny | 11° /2° | 0 mm | 4 | |
| 17 Dec. | Partly cloudy | 10° /2° | 0.2 mm | 3 | |
| 18 Dec. | Sunny | 12° /5° | 0.3 mm | 4 | |
| 19 Dec. | Sunny | 12° /5° | 1.6 mm | 4 | |
| 20 Dec. |  Overcast | 11° /3° | 15.1 mm | 3 | |
| 21 Dec. | Partly cloudy | 9° /2° | 0 mm | 4 | |
| 22 Dec. |  Cloudy | 11° /2° | 2.5 mm | 3 | |
| 23 Dec. | Partly cloudy | 9° /3° | 0.8 mm | 3 | |
| 24 Dec. | Mist | 10° /2° | 0 mm | 3 | |
| 25 Dec. | Cloudy | 11° /3° | 0 mm | 3 | |
| 26 Dec. | Cloudy | 10° /2° | 0 mm | 3 | |
| 27 Dec. | Partly cloudy | 11° /2° | 0 mm | 4 | |
| 28 Dec. | Overcast | 10° /3° | 0 mm | 3 | |
| 29 Dec. | Patchy rain possible | 12° /5° | 0.3 mm | 4 | |
| 30 Dec. | Patchy rain possible | 12° /5° | 0 mm | 4 | |
| 31 Dec. | Patchy rain possible | 11° /5° | 0.2 mm | 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 | 16°/4° | 11°/2° | 12°/1° |
| Rainfall | 97 mm | 125 mm | 77 mm |
| Wind | 15.4 km/h | 11 km/h | 15 km/h |
| Humidity | 76% | 79% | 78% |
| Rainy days | 2 days | 3 days | 4 days |
| Dry days | 28 days | 28 days | 27 days |
Planning a trip to Siena? Discover the best time to visit
Siena in December - FAQ
What to pack to Siena in December?
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
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
December rainfall patterns in Siena
Quick links
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.