May weather forecast
Siena, Italy

Weather in May

The last month of the spring, May, is an agreeable month in Siena, Italy, with an average temperature ranging between min 8.9°C (48°F) and max 20.4°C (68.7°F).

Temperature

In May, the average high-temperature is practically the same as in April - a pleasant 20.4°C (68.7°F). The average low-temperature, in May, is 8.9°C (48°F).

Humidity

The average relative humidity in May is 78%.

Rainfall

In Siena, during May, the rain falls for 13.5 days and regularly aggregates up to 39mm (1.54") of precipitation. In Siena, Italy, during the entire year, the rain falls for 123.6 days and collects up to 363mm (14.29") of precipitation.

Snowfall

In Siena, Italy, snow does not fall in April through November.

Daylight

In Siena, the average length of the day in May is 14h and 42min.
On the first day of May, sunrise is at 06:07 and sunset at 20:15. On the last day of the month, sunrise is at 05:37 and sunset at 20:47 CEST.

Sunshine

In May, the average sunshine in Siena, Italy, is 10.4h.

UV index

In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 5 in May interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in May in Siena?

In May, the average relative humidity is 78%.

How many days does it rain in May in Siena?

In May, in Siena, Italy, the rain falls for 13.5 days. Throughout May, 39mm (1.54") of precipitation is accumulated.

When it does not snow in Siena?

In Siena, snow does not fall in April through November.

How many hours of daylight does Siena have in May?

In May, the average day length in Siena, Italy, is 14h and 42min.

When are sunrise and sunset in May in Siena?

On the first day of May in Siena, Italy, sunrise is at 06:07 and sunset at 20:15. On the last day of the month, sunrise is at 05:37 and sunset at 20:47 CEST.

How many hours of sunshine does Siena have in May?

The average sunshine duration in May in Siena is 10.4h.

How high is the UV index in May in Siena?

The average daily maximum UV index in May in Siena is 5. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Siena, Italy

Average temperature in May - Siena, Italy
  • Average high temperature in May: 20.4°C

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).

  • Average low temperature in May: 8.9°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 in May
Siena, Italy

Average pressure in May - Siena, Italy
  • Average pressure in May: 1014mbar

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 in May
Siena, Italy

Average wind speed in May - Siena, Italy
  • Average wind speed in May: 8.1km/h

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 humidity in May
Siena, Italy

Average humidity in May - Siena, Italy
  • Average humidity in May: 78%

The month with the highest relative humidity is November (85%).
The month with the lowest relative humidity is August (63%).

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Average rainfall in May
Siena, Italy

Average rainfall in May - Siena, Italy
  • Average rainfall in May: 39mm

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 in May
Siena, Italy

Average rainfall days in May - Siena, Italy
  • Average rainfall days in May: 13.5 days

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 in May
Siena, Italy

Average snowfall in May - Siena, Italy
  • Average snowfall in May: 0mm

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

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Average snowfall days in May
Siena, Italy

Average snowfall days in May - Siena, Italy
  • Average snowfall days in May: 0 days

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

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Average daylight in May /
Average sunshine in May
Siena, Italy

Average daylight in May / Average sunshine in May - Siena, Italy
  • Average daylight in May: 14h and 42min

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 2min).

  • Average sunshine in May: 10h and 24min

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).

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Average sunshine days in May
Siena, Italy

Average sunshine days in May - Siena, Italy
  • Average sunshine days in May: 16.2 days

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 UV index in May
Siena, Italy

Average UV index in May - Siena, Italy
  • Average UV index in May: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in May
Siena, Italy

Average cloud cover in May - Siena, Italy
  • Average cloud cover in May: 32

The months with the most cloud cover are January, February and November (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in May
Siena, Italy

Average visibility in May - Siena, Italy
  • Average visibility in May: 9km

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

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