Siena monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Siena

Siena average temperature chart (Celsius) Siena average temperature chart (Fahrenheit)
Average monthly temperatures in Siena (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 9.1 10.4 12.9 16.3 20.8 24.7 28.4 28.1 24.2 19.2 13.7 9.6
°F 48.4 50.7 55.2 61.4 69.4 76.5 83.1 82.5 75.6 66.6 56.6 49.3

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Siena monthly rainfall chart (mm) Siena monthly rainfall chart (inches)
Average monthly rainfall in Siena (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 65 63 60 65 58 41 30 43 69 76 103 69
inches 2.6 2.5 2.4 2.6 2.3 1.6 1.2 1.7 2.7 3 4.1 2.7
Rainy days 13 12 13 14 12 10 6 8 9 12 14 13

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Siena

Siena average daily sunshine chart
Average daily sunshine Siena
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 3.9 4.4 5.3 6.4 7.8 9.1 10.4 9.5 7.6 5.8 3.9 3.5

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Siena average minimum / maximum temperatures (Celsius) Siena average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Siena (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 2.4 3.1 4.5 7.1 10.6 14 16.7 16.7 14 10.6 6.6 3.3
Max °C 9.3 10.6 13.1 16.6 21.1 25 28.7 28.4 24.5 19.5 13.9 9.8
Min °F 36.2 37.5 40.1 44.7 51 57.2 62.1 62 57.1 51 43.8 37.9
Max °F 42.4 44.2 47.8 53.2 60.4 67.1 72.9 72.5 66.6 59 50.4 43.7

Sea temperature

The graph below shows the average sea temperature.

Siena average sea temperature chart (Celsius) Siena average sea temperature chart (Fahrenheit)
Average sea temperature around Siena in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 13.6 13 13.3 14.8 18 21.5 24.4 25.2 23.1 20.4 17.5 15.1
°F 56.4 55.4 55.9 58.6 64.4 70.8 75.9 77.3 73.5 68.7 63.5 59.2

Wind speed

The graph below shows the average wind speed.

Siena average winspeed by month (km/h) Siena average winspeed by month (mph)
Average wind speed in Siena (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 11 12 12 11 10 9 9 9 9 9 11 12
mph 7 7 7 7 6 6 6 5 5 6 7 7

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Siena relative humidity averages
Average relative humidity in Siena
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
77% 74% 71% 72% 72% 70% 66% 68% 71% 76% 79% 79%
Siena

Other monthly averages

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Siena weather stats

Siena weather statistics
Hottest month: July 28.4°C 83.1°F
Driest month: July 30mm 1.2ins
Sunniest month: July 10.4hrs
Coldest month: January 9.1°C 48.4°F
Wettest month: November 103mm 4.1ins
Warmest sea: August 25.2°C 77.4°F
Map showing location of Siena (43.32004, 11.33283)

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