Climate of Siena

Siena has a mediterranean climate. The summers are hot and dry, and the temperature is mild in the winter. The average annual temperature for Siena is 18° degrees and there is about 290 mm of rain in a year. It is dry for 224 days a year with an average humidity of 77% and an UV-index of 4.

Climate averages for the whole year

Day: the average daily temperature during the day is between 8°C and 30°C
Night:the average nighttime temperature is between 2°C and 16°C
Rain: it rains 117 days and there is a total of approximately 290 mm rainfall
Snow: it snows an average of 5 days per year
Sun hours: throughout the year there are 3167 sun hours

Maximum temperature:	between 8°C and 30°C
Warmest month:	30°C in August
Coldest month:	8°C in January
Night temperature:	between 2°C and 16°C
Dry days:	243 days
Days with rain:	117 days
Days with snow:	5 days
Total rain sum:	290 mm
Hours of sunshine:	3167 hours

Climate of Siena
Temperature graph
Precipitation graph
Climate chart of Siena
The best travel time for Siena
Climate of Siena by month
Experiences with the weather of Siena

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Temperature graph

This graph shows the average maximum temperature (red) and minimum temperature (blue) for Siena.

Precipitation graph

This graph shows the average amount of rainfall per month for Siena.

Climate table of Siena

In this climate table you can see at a glance what the average weather per month is for Siena. The data has been collected over a 30-year period, from which an average per month has been derived. From year to year the differences may be larger or smaller, but with this climate table you have a good idea of what the weather for Siena might be like in a given month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Day temp. (°C)	8	9	13	18	21	25	29	30	25	19	14	10
Night temp. (°C)	2	2	4	7	9	13	15	16	13	10	6	3
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Precipitation (mm)	29	30	26	22	24	22	12	10	25	27	36	27
Days with rain	12	11	12	12	12	8	6	5	9	9	11	10
Days with snow	1	2	1	-	-	-	-	-	-	-	-	1
Dry days	18	15	18	18	19	22	25	26	21	22	19	20
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sun hours per day	5	5	8	10	11	12	12	12	11	6	6	6
Wind force (Bft)	2	2	2	2	2	2	2	2	2	2	2	2
UV-index	2	3	4	4	5	6	6	6	5	4	3	2

Best time to visit Siena

The best time to visit Siena in Italy is from April through October. In this period you have a warm temperature and almost no precipitation. The highest average temperature in Siena is 30°C in August and the lowest is 8°C in January.

Climate of Siena by month

What is the average climate in a given month for Siena? Click on a month to see all monthly averages for sunshine, maximum and minimum temperatures, percent chance of rain per day, snowfall and number of rainy days.

January