Monthly weather forecast and climate
Siena, Italy

Weather in January

January, like December, is another chilly winter month in Siena, Italy, with average temperature varying between 8.5°C (47.3°F) and 1.9°C (35.4°F). With an average high-temperature of 8.5°C (47.3°F) and an average low-temperature of 1.9°C (35.4°F), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter, in Siena, is also a frosty month, with average temperature fluctuating between 2.2°C (36°F) and 9.7°C (49.5°F). In Siena, the average high-temperature in February is practically the same as in January - a still chilly 9.7°C (49.5°F). Weather in February »

Weather in March

The first month of the spring, March, is a moderate month in Siena, Italy, with temperature in the range of an average high of 13.3°C (55.9°F) and an average low of 4.1°C (39.4°F). In Siena, Italy, the average high-temperature marginally rises, from a frosty 9.7°C (49.5°F) in February, to a moderate 13.3°C (55.9°F). Weather in March »

Weather in April

April is an enjoyable spring month in Siena, Italy, with average temperature varying between 17.5°C (63.5°F) and 6.8°C (44.2°F). In Siena, Italy, the average high-temperature marginally rises, from a moderate 13.3°C (55.9°F) in March, to an enjoyable 17.5°C (63.5°F). Weather in April »

Weather in May

May, the last month of the spring, in Siena, is an agreeable month, with average temperature varying between 8.9°C (48°F) and 20.4°C (68.7°F). In May, the average high-temperature is essentially the same as in April - an agreeable 20.4°C (68.7°F). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Siena, Italy, with temperature in the range of an average low of 12.9°C (55.2°F) and an average high of 25.4°C (77.7°F). In June, the average high-temperature rises, from a pleasant 20.4°C (68.7°F) in May, to a warm 25.4°C (77.7°F). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Siena, Italy, with temperature in the range of an average high of 29.7°C (85.5°F) and an average low of 15.5°C (59.9°F). In Siena, the average high-temperature in July slightly increases, from 25.4°C (77.7°F) in June, to a still warm 29.7°C (85.5°F). Weather in July »

Weather in August

August, the last month of the summer, in Siena, is a tropical month, with average temperature varying between 16.3°C (61.3°F) and 30.3°C (86.5°F). August is the warmest month, with an average high-temperature of 30.3°C (86.5°F) and an average low-temperature of 16.3°C (61.3°F). The average heat index is estimated at a hot 34.1°C (93.4°F). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Siena, Italy, with average temperature fluctuating between 24.5°C (76.1°F) and 13.2°C (55.8°F). In Siena, Italy, the average high-temperature in September decreases, from a hot 30.3°C (86.5°F) in August, to a moderately hot 24.5°C (76.1°F). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Siena, Italy, with average temperature varying between 19.5°C (67.1°F) and 10.1°C (50.2°F). In Siena, Italy, the average high-temperature decreases, from a moderately hot 24.5°C (76.1°F) in September, to a comfortable 19.5°C (67.1°F). Weather in October »

Weather in November

November, the last month of the autumn, in Siena, is also a moderate month, with average temperature ranging between max 13.6°C (56.5°F) and min 6.4°C (43.5°F). In Siena, the average high-temperature in November decreases, from an enjoyable 19.5°C (67.1°F) in October, to a moderate 13.6°C (56.5°F). Weather in November »

Weather in December

December, the first month of the winter, in Siena, is also a frosty month, with average temperature fluctuating between 3.1°C (37.6°F) and 9.5°C (49.1°F). In Siena, the average high-temperature in December slightly decreases, from a mild 13.6°C (56.5°F) in November, to a frosty 9.5°C (49.1°F). Weather in December »
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FAQ

What is the coldest month in Siena?

With an average high-temperature of 8.5°C (47.3°F) and an average low-temperature of 1.9°C (35.4°F), January is the coldest month in Siena, Italy.

How much does it rain in Siena?

Throughout the year, there are 123.6 rainfall days, and 363mm (14.29") of precipitation is accumulated.

When does it snow in Siena?

Months with snowfall are January through March and December.

How much does it snow in Siena?

In Siena, Italy, during the entire year, snow falls for 3.6 days, and aggregates up to 48mm (1.89") of snow.

What is the month with the least sunshine in Siena?

With an average of 5.3h of sunshine, January has the least sunshine of the year in Siena.

What is the month with the lowest UV index in Siena?

Months with the lowest UV index are January and December, with an average maximum UV index of 2.

What is the snowiest month in Siena?

February is the month with the most snowfall. Snow falls for 1.4 days and accumulates 20mm (0.79") of snow.

When it does not snow in Siena?

April through November are months without snowfall.

When are the longest days in Siena?

June has the longest days of the year in Siena, with an average of 15.4h of daylight.

What is the month with the highest UV index in Siena?

June through August, with an average maximum UV index of 6, are months with the highest UV index.

What are the months with the most sunshine in Siena?

July and August, with an average of 11.9h of sunshine, are months with the most sunshine in Siena.

What is the warmest month in Siena?

With an average high-temperature of 30.3°C (86.5°F) and an average low-temperature of 16.3°C (61.3°F), August is the warmest month in Siena.

What is the least humid month in Siena?

August is the least humid month, with an average relative humidity of 63%.

What is the driest month in Siena?

August is the month with the least rainfall. Rain falls for 5.8 days and accumulates 14mm (0.55") of precipitation.

What is the most humid month in Siena?

November is the most humid month, with an average relative humidity of 85%.

What is the rainiest month in Siena?

November is the month with the most rainfall in Siena. Rain falls for 12.2 days and accumulates 50mm (1.97") of precipitation.

What is the month with the shortest days in Siena?

The month with the shortest days in Siena is December, with an average of 9h of daylight.

Average temperature
Siena, Italy

Average temperature - Siena, Italy

The warmest month (with the highest average high temperature) is August (30.3°C).
The month with the lowest average high temperature is January (8.5°C).

The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is January (1.9°C).

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Average pressure
Siena, Italy

Average pressure - Siena, Italy

The month with the highest atmospheric pressure is December (1018.4mbar).
The month with the lowest atmospheric pressure is July (1013.5mbar).

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Average wind speed
Siena, Italy

Average wind speed - Siena, Italy

The windiest months (with the highest average wind speed) are February and March (10.8km/h).
The calmest month (with the lowest average wind speed) is June (7.1km/h).

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Average rainfall
Siena, Italy

Average rainfall - Siena, Italy

The wettest month (with the highest rainfall) is November (50mm).
The driest month (with the least rainfall) is August (14mm).

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Average rainfall days
Siena, Italy

Average rainfall days - Siena, Italy

The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is August (5.8 days).

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Average snowfall
Siena, Italy

Average snowfall - Siena, Italy

The month with the highest snowfall is February (20mm).
Months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

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Average snowfall days
Siena, Italy

Average snowfall days - Siena, Italy

The month with the highest number of snowfall days is February (1.4 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Siena, Italy

Average daylight / Average sunshine - Siena, Italy

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

Months with the most sunshine are July and August (Average sunshine: 11.9h).
The month with the least sunshine is January (Average sunshine: 5.3h).

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Average sunshine days
Siena, Italy

Average sunshine days - Siena, Italy

The month with the most sunshine days is August (23.9 days).
The month with the least sunshine days is February (14.6 days).

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Average visibility
Siena, Italy

Average visibility - Siena, Italy

Months with the highest visibility are February, March, April, May, June, July, August, September and December (9km).
Months with the lowest visibility are January, October and November (8km).

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