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Weather in Siena for December 2026

Your guide to Siena weather in December - trends and predictions

    Temperatures

  • In general, the average temperature in Siena at the beginning of December is 10.9 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 10.4 °C by the end of December.

    • Rain 🌧️

  • With an average of 3 rainy days, Siena experiences minimal rainfall in December.

    • More

  • Is December a good time to visit Siena? check out the best time to travel to Siena page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
28
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
11°/2°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
79 %
Avg humidity

Siena Weather December

Move between months or click on a day
November
January
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Sunny
14°
2
Light rain shower
13°
3
Partly cloudy
10°
4
Patchy rain possible
9°
5
Moderate rain
10°
6
Overcast
10°
7
Sunny
10°
8
Patchy rain possible
9°
9
Mist
9°
10
Patchy rain possible
11°
11
Patchy rain possible
11°
12
Sunny
12°
13
Light rain shower
11°
14
Light rain shower
11°
15
Sunny
11°
16
Sunny
11°
17
Partly cloudy
11°
18
Patchy rain possible
13°
19
Sunny
12°
20
Overcast
12°
21
Partly cloudy
10°
22
Cloudy
11°
23
Partly cloudy
9°
24
Mist
10°
25
Cloudy
10°
26
Partly cloudy
10°
27
Sunny
11°
28
Overcast
11°
29
Sunny
11°
30
Patchy rain possible
10°
31
Patchy rain possible
10°

Temperatures trend during December in Siena

See the weather trend as well as the moving average line

December weather in Siena day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
1 Dec. Sunny
Sunny
 14° /6° 0.4 mm 4
2 Dec. Light rain shower
Light rain shower
 13° /4° 3.1 mm 4
3 Dec. Partly cloudy
Partly cloudy
 10° /3° 0 mm 3
4 Dec. Patchy rain possible
Patchy rain possible
 9° /3° 0.9 mm 3
5 Dec. Moderate rain
Moderate rain
 10° /3° 8.1 mm 3
6 Dec. Overcast
Overcast
 10° /1° 0 mm 3
7 Dec. Sunny
Sunny
 10° /1° 0.3 mm 3
8 Dec. Patchy rain possible
Patchy rain possible
 9° /2° 5 mm 3
9 Dec. Mist
Mist
 9° /3° 5.8 mm 2
10 Dec. Patchy rain possible
Patchy rain possible
 11° /4° 0.2 mm 3
11 Dec. Patchy rain possible
Patchy rain possible
 11° /4° 0.2 mm 3
12 Dec. Sunny
Sunny
 12° /5° 0.3 mm 4
13 Dec. Light rain shower
Light rain shower
 11° /4° 1.5 mm 3
14 Dec. Light rain shower
Light rain shower
 11° /4° 1.6 mm 3
15 Dec. Sunny
Sunny
 11° /3° 0.6 mm 4
16 Dec. Sunny
Sunny
 11° /3° 0.7 mm 3
17 Dec. Partly cloudy
Partly cloudy
 11° /4° 1.8 mm 3
18 Dec. Patchy rain possible
Patchy rain possible
 13° /6° 0.2 mm 3
19 Dec. Sunny
Sunny
 12° /6° 1.2 mm 3
20 Dec. Overcast
Overcast
 12° /4° 10.1 mm 2
21 Dec. Partly cloudy
Partly cloudy
 10° /3° 0 mm 2
22 Dec. Cloudy
Cloudy
 11° /3° 1.7 mm 2
23 Dec. Partly cloudy
Partly cloudy
 9° /4° 3.8 mm 2
24 Dec. Mist
Mist
 10° /3° 6.1 mm 2
25 Dec. Cloudy
Cloudy
 10° /3° 3.6 mm 2
26 Dec. Partly cloudy
Partly cloudy
 10° /2° 0 mm 2
27 Dec. Sunny
Sunny
 11° /1° 0 mm 2
28 Dec. Overcast
Overcast
 11° /2° 0 mm 2
29 Dec. Sunny
Sunny
 11° /3° 0.2 mm 2
30 Dec. Patchy rain possible
Patchy rain possible
 10° /4° 0.7 mm 2
31 Dec. Patchy rain possible
Patchy rain possible
 10° /3° 0.2 mm 2
Next
Important Notice
Our weather forecast for Siena in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Siena forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Siena weather in December vs November vs January

Compare December weather in Siena with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
NovemberDecemberJanuary
WeatherPatchy rain possible
Patchy rain possible
Sunny
Sunny
Patchy rain possible
Patchy rain possible
Temperatures16°/4°11°/2°12°/1°
Rainfall97 mm125 mm77 mm
Wind15.4 km/h11 km/h15 km/h
Humidity76%79%78%
Rainy days2 days3 days4 days
Dry days28 days28 days27 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?

Prepare for cooler days with highs just around 11° and colder nights, dipping below 2°.

How much rainfall should be expected in Siena during December?

Significant rainfall exceeding 124.9 mm is expected in Siena during December, occurring over more than 3 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Siena during December?

The average wind speed in Siena during December is 11 km/h, suggesting breezy to windy conditions, depending on your activities.

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

Explore the daily rainfall trends and prepare for Sienas December weather 💧
Typically, Siena has 3 rainy days in December with a total of 124.9 mm of rainfall.

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Get accurate weather forecasts for Siena, located at latitude 43.318 and longitude 11.331. Stay updated with localized weather information tailored for Siena.

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