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Weather in Siena for January 2026

Your guide to Siena weather in January - trends and predictions

    Temperatures

  • Until now, January 2026 in Siena is slightly cooler than the historical average by -1.9 °C.

  • The forecast for the next days in Siena predicts temperatures to be around 10 °C, close to the historical average.

  • In general, the average temperature in Siena at the beginning of January is 9.7 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 10.9 °C by the end of January.

    • Rain 🌧️

  • With an average of 4 rainy days, Siena experiences minimal rainfall in January.

    • More

  • Is January 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
27
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
12°/1°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Siena Weather January

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

Temperatures trend during January in Siena

See the weather trend as well as the moving average line

January weather in Siena day by day

Click on a date for more information
December February
Date Weather Temperatures Rain UV More
1 Jan. Patchy rain possible
Patchy rain possible
 9° /3° 2.1 mm 2
2 Jan. Patchy rain possible
Patchy rain possible
 11° /4° 0.3 mm 2
3 Jan. Patchy rain possible
Patchy rain possible
 12° /4° 0.6 mm 2
4 Jan. Patchy rain possible
Patchy rain possible
 10° /3° 4.6 mm 2
5 Jan. Patchy rain possible
Patchy rain possible
 9° /3° 1.1 mm 2
6 Jan. Light rain shower
Light rain shower
 9° /5° 11.1 mm 2
7 Jan. Light drizzle
Light drizzle
 8° /3° 1 mm 2
8 Jan. Overcast
Overcast
 8° /0° 0.1 mm 2
9 Jan. Light rain shower
Light rain shower
 11° /3° 2 mm 2
10 Jan. Patchy rain possible
Patchy rain possible
 8° /2° 1.7 mm 2
11 Jan. Overcast
Overcast
 8° /1° 1.1 mm 1
12 Jan. Overcast
Overcast
 8° /0° 0 mm 2
13 Jan. Partly cloudy
Partly cloudy
 8° /1° 0 mm 1
14 Jan. Patchy rain possible
Patchy rain possible
 9° /2° 0.1 mm 2
15 Jan. Patchy rain possible
Patchy rain possible
 9° /3° 0.3 mm 2
16 Jan. Patchy rain possible
Patchy rain possible
 10° /4° 0.4 mm 2
17 Jan. Light rain shower
Light rain shower
 11° /3° 1.9 mm 2
18 Jan. Patchy rain possible
Patchy rain possible
 13° /4° 1.6 mm 4
19 Jan. Patchy rain possible
Patchy rain possible
 11° /2° 0.2 mm 2
20 Jan. Sunny
Sunny
 7° /1° 4.4 mm 2
21 Jan. Overcast
Overcast
 8° /0° 0 mm 1
22 Jan. Partly cloudy
Partly cloudy
 9° /1° 0.6 mm 2
23 Jan. Overcast
Overcast
 10° /4° 2.2 mm 2
24 Jan. Overcast
Overcast
 11° /4° 5.9 mm 2
25 Jan. Sunny
Sunny
 12° /4° 6.3 mm 3
26 Jan. Partly cloudy
Partly cloudy
 12° /3° 3 mm 2
27 Jan. Sunny
Sunny
 13° /3° 0.5 mm 3
28 Jan. Heavy rain
Heavy rain
 11° /6° 28.2 mm 0.1
29 Jan. Patchy rain possible
Patchy rain possible
 9° /4° 1.9 mm 0.2
30 Jan. Patchy rain possible
Patchy rain possible
 8° /2° 4.9 mm 0.2
31 Jan. Partly cloudy
Partly cloudy
 11° /3° 0 mm 0.2
Next
Important Notice
Our weather forecast for Siena in January 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 January vs December vs February

Compare January 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.
DecemberJanuaryFebruary
WeatherSunny
Sunny
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures11°/2°12°/1°13°/3°
Rainfall125 mm77 mm153 mm
Wind11 km/h15 km/h11.8 km/h
Humidity79%78%79%
Rainy days3 days4 days10 days
Dry days28 days27 days19 days

Planning a trip to Siena? Discover the best time to visit

Siena in January - FAQ

What are the expected maximum and minimum temperatures in Siena during January?

Prepare for cooler days with highs just around 12° and colder nights, dipping below 1°.

How much rainfall should be expected in Siena during January?

Moderate rainfall is anticipated in Siena during January, with a total of 77.4 mm spread over approximately 4 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Siena during January?

The average wind speed in Siena during January is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Siena in January?

As you prepare for your trip to Siena in January, 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 January, 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

January rainfall patterns in Siena

Explore the daily rainfall trends and prepare for Sienas January weather 💧
Typically, Siena has 4 rainy days in January with a total of 77.4 mm of rainfall.

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Location coordinates 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.

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