Siena Climate by Month
Siena has a warm maritime climate that is strongly influenced by the Mediterranean sea. Due to this influence the weather is very stable. This means summer and winter temperatures are not very far apart and it rarely gets really hot or extremely cold. Rainfall is evenly distributed throughout the year, but in summer months the average rainfall is a bit lower. In winter months, the average daily temperature is around 10°C .
Average day and night temperature
Depending on the time of the year, temperatures range from very warm to chilly in Siena. Typically, daytime temperatures range from a very warm 31°C in August to a chilly 10°C in the coolest month, January. Nights are cooler, with temperatures generally dropping to 2°C, particularly during the colder months.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Generally, Siena has a moderate amount of precipitation, averaging 903 mm of rain/snowfall annually. The climate in Siena shows significant variation throughout the year. Expect high rainfall in November, with an average of 121 mm of precipitation over 14 rainy days. In contrast, July offers drier and sunnier days, with around 33 mm of rainfall over 6 rainy days.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
For those who appreciate different seasons, Siena serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 11.7 hours of sunshine daily, and embrace the darker days in November, offering only 3.3 hours of daily sunlight.Monthly hours of sunshine
Daily hours of sunshine
The best time of year to visit Siena in Italy
During the months of May, September and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in June, July, August and September.
August has an average maximum temperature of 31°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 10°C.
November tops the wettest month list with 121 mm of rainfall.
July is the driest month with 33 mm of precipitation.
July is the sunniest month with an average of 350 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
