Siena weather in January
Temperature, rain and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: May – September
What is the weather like in Siena in January?
In January, Siena is cold: daytime highs average 9 °C, and nights cool down to about 1 °C. Expect around 4 hours of sunshine a day. Rain falls on about 9 days, adding up to 61 mm. All in all, January is not an ideal month for a holiday in Siena.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 26 | 27 | 38 |
| Day | 9° | 9° | 10° |
| Night | 2° | 1° | 1° |
| Sun | 4 h | 4 h | 5 h |
| Rain days | 11 | 9 | 9 |
More details for January
- Daylight
- 9 h 18 min07:44 – 17:02
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 63 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 1 day1 cm or more of fresh snow
- Time zone
- UTC+1Europe/Rome
How the score comes together
- Temperatureweight 50 %7 %
- Sunshineweight 20 %18 %
- Few rainy daysweight 30 %65 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- Warm jacket
- Rain jacket or umbrella
Siena in January: quick answers
Is Siena hot in January?
No. In January, Siena is cold: daytime highs average 9 °C and nights drop to about 1 °C.
Does it rain much in Siena in January?
Rain falls on about 9 days, adding up to 61 mm.
Siena month by month
The whole year in SienaAll destinations: ItalyWhere to go in January
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences