Siena weather and climate in 2025
January
February
March
April
May
June
July
August
September
October
November
December
Overview
July
< June
Overview
August >
Siena weather and climate in 2025
January
February
March
April
May
June
July
August
September
October
November
December
Overview
July
< June
Overview
August >
Day
30 °C
Night
18 °C
Sea
24 °C
Precipitation
27 mm
in month
Rainy days
4 days
in month
Daylight
15 hours
average
Sunshine
10 hours
average
Humidity
66 %
Day
30 °C
Night
18 °C
Sea
24 °C
Precipitation
27 mm
in month
Rainy days
4 days
in month
Daylight
15 hours
average
Sunshine
10 hours
average
Humidity
66 %
Overview: Siena
Weather charts for Siena
Weather overview
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Weather overview for Siena
Weather overview
Siena (Italy) in general has a mild climate. The day temperatures range from 9 °C (48 °F) in January to 30 °C (86 °F) in July. The least rainy month in Siena is July with its 4 days of rain, the rainiest month is November, when it rains 11 days. The highest night temperatures could be experienced in July with 18 °C (64 °F), the lowest in January with 2 °C (36 °F).
January weather
The day temperature is on its minimum in Siena, and the minimum of the night temperature is observable too, with its value of 2 °C (36 °F). The rainfall amount descents similarly to the previous month, with its value of 51 mm (2.02 in). The beginning of the rise of the number of sun hours (without clouds) could be noticed in January. The wind speed is on its minimum, with its value of 2.
February weather
The day temperature rise's start could be observed, with its value of 10 °C (51 °F) in Siena. The number of rainy days starts to rise in this month. The number of sun hours (without clouds) continues to rise, with its value being 4 hours.
March weather
The night temperature starts to rise, with its value of 5 °C (41 °F) in Siena, while the day temperature continues to rise, its value is 14 °C (57 °F). The wind speed reaches its maximum. The number of sun hours (without clouds) continues to rise.
April weather
The tourist season slowly starts in Siena. The day temperature rises similarly to the previous month, and the night temperature continues to rise too, with its value of 8 °C (46 °F). The number of rainy days rise's start could be observed, its value is 10 days, and the beginning of the rise of the rainfall amount could be noticed as well in April.
May weather
The tourist season continues in Siena. The rise of the day temperature can be observed, and the night temperature continues to rise too, with its value of 12 °C (54 °F). The beginning of the descent of the number of rainy days could be noticed, with its value of 9 days, and the rainfall amount starts to descent as well in May.
June weather
The ongoing tourist season is noticeable in Siena. The rise of the day temperature can be observed, with its value being 26 °C (80 °F), and the night temperature continues to rise too. The number of rainy days descents similarly to the previous month, and the rainfall amount descents similarly to the previous month too, the value of this measure is 51 mm (1.99 in).
July weather
The maximum of the day temperature is observable in Siena, and the maximum of the night temperature can be noticed too, the value of this measure is 18 °C (64 °F). There is pending tourist season. The number of rainy days reaches its minimum, and the rainfall amount is on its minimum as well, the value of this measure is 27 mm (1.08 in). The maximum of the number of sun hours (without clouds) is observable in July.
August weather
The tourist season is close to its peak in Siena, and there is pending dry season as well. The number of rainy days starts to rise, and the beginning of the rise of the rainfall amount could be noticed too in August. The number of sun hours (without clouds) starts to descent, with its value of 9 hours.
September weather
The tourist season is close to its peak in Siena. The day temperature descent's start could be observed, and the night temperature starts to descent too, with its value of 14 °C (58 °F). The number of rainy days rises similarly to the previous month, with its value of 8 days, and the rainfall amount rises similarly to the previous month as well, with its value of 69 mm (2.72 in).
October weather
The day temperature descents similarly to the previous month, the value of this measure is 20 °C (67 °F) in Siena, and the night temperature continues to descent too, with its value being 11 °C (52 °F). There is pending tourist season this month. The number of rainy days continues to rise, the value of this measure is 9 days, and the rise of the rainfall amount can be observed too, with its value of 89 mm (3.52 in).
November weather
The day temperature continues to descent, with its value being 14 °C (57 °F) in Siena, and the night temperature continues to descent too, its value is 7 °C (45 °F). The maximum of the number of rainy days is observable, the value of this measure is 11 days, and the maximum of the rainfall amount is observable as well in November. The number of sun hours (without clouds) descents similarly to the previous month, with its value being 3 hours.
December weather
The day temperature descents similarly to the previous month, with its value of 9 °C (49 °F) in Siena, and the descent of the night temperature can be observed too, with its value being 3 °C (38 °F). The number of rainy days starts to descent, its value is 10 days, and the rainfall amount descent's start could be observed as well in December. The minimum of the number of sun hours (without clouds) is observable, with its value of 3 hours.
FAQs
How humid is Siena in February?
In February in Siena, expect humidity around 74 %.
How windy is Siena in March?
An average wind scale that can be expected in Siena in March is 2. It is rather a milder or unnoticeable wind, therefore it will not bother you during your holiday.
What is the air temperature in Siena in April at night?
The average night temperature in April in Siena is 8 °C (46 °F). The nights will be cool, layers of clothes will be needed for evening and morning walks, the hotel should be equipped with heating.
Are there good conditions to visit in May in Siena?
May is a good month to visit Siena. You can expect just 9 days of rain during the month, taking an umbrella is not necessary. There are some people, who may feel a slight chill at 22 °C (72 °F), but others will feel perfectly fine. The temperature of 12 °C (54 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
What is the sea temperature in Siena in June?
The sea will reach 21 °C (70 °F) in June in Siena. The sea at this temperature is quite cold, but it is already possible to stay in it for a long time and it is pleasantly refreshing on hot, steamy days.
What temperature can I expect during the day in July in Siena?
The average daily temperature in July in Siena is 30 °C (86 °F). The great temperature for lying by the sea or pool and sunbathing, everywhere else you will probably be a bit hot. Don't forget to drink during the day, in these temperatures you should hydrate yourself a lot.
Is it hot in Siena in August?
In August in Siena, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
How many days of precipitation on average can I expect in September in Siena?
There are 8 days, which are rainy in Siena in September, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 1.9 days of the week, or in general - 27 % days.
Is there a wet season in October in Siena?
No, there is no wet season in October in Siena - you can expect 9 days of rain during the month.
How many sunny hours can I expect in Siena in November?
In November in Siena, you can expect around 3 hours of sunshine.
Is December part of the dry season in Siena?
No, December is not a dry month in Siena, expect rain approximately 10 days in a month.
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