Climate - Siena (Tuscany)
Average weather, temperature, rainfall, sunshine hours
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Climate chart - Siena (Tuscany)
The climate of Siena can be described as transitional Mediterranean, since it has relatively mild winters and hot, sunny summers.
The city is located in central Tuscany, 320 meters (1,050 feet) above sea level. We are in a vast hilly area, which includes the Montagnola Senese to the west and the Crete Senesi to the southeast. The hilly area to the north, which extends to the provinces of Arezzo and Florence, is called Chianti.
The historic center is a UNESCO World Heritage Site.
Winter, from December to February, is quite mild, however, due to the altitude and distance from the sea, it is a little colder than on the coast.
Snow in Siena is quite rare, however, it can sometimes occur. Typically, the snow reaches 15-20 cm (6-8 in) during the heaviest snowfalls, but in February 1991 it reached 40 cm (15.5 in).
On the coldest nights of the year, the temperature can drop to -4/-5 °C (23/25 °F), while during the most intense cold spells it can drop lower. In January 1985 it dropped to -11.7 °C (10.9 °F).
The summer, from June to August, is hot and sunny, with rare rainy days and a few thunderstorms coming from the Apennines.
Usually, the humidity is not high and the air becomes cool at night, however, there can also be very hot periods. The temperature reached 40.7 °C (105.3 °F) in July 1983 and 40 °C (104 °F) in August 2017.
Best Time
The best times to visit Siena are spring and autumn, ie from mid-April to mid-June and from September to early October. In June, the weather is often nice, but it can sometimes get hot, especially in the second half of the month.
Siena - Climate data
The average temperature of the coldest month (January) is of 6.4 °C (43.6 °F), that of the warmest month (August) is of 24.4 °C (75.8 °F). Here are the average temperatures.Siena - Average temperatures (1991-2020) | Month | Min (°C) | Max (°C) | Mean (°C) | Min (°F) | Max (°F) | Mean (°F) |
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| January | 3.1 | 9.8 | 6.4 | 38 | 50 | 43.6 |
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| February | 3 | 11 | 7 | 37 | 52 | 44.6 |
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| March | 5.3 | 14.6 | 10 | 42 | 58 | 49.9 |
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| April | 7.9 | 18.1 | 13 | 46 | 65 | 55.4 |
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| May | 11.6 | 22.7 | 17.2 | 53 | 73 | 62.9 |
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| June | 15.2 | 27.1 | 21.2 | 59 | 81 | 70.1 |
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| July | 17.7 | 30.5 | 24.1 | 64 | 87 | 75.4 |
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| August | 18 | 30.7 | 24.4 | 64 | 87 | 75.8 |
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| September | 14.4 | 25 | 19.7 | 58 | 77 | 67.5 |
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| October | 11.1 | 19.8 | 15.4 | 52 | 68 | 59.8 |
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| November | 7.2 | 14.2 | 10.7 | 45 | 58 | 51.3 |
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| December | 3.9 | 10.3 | 7.1 | 39 | 51 | 44.8 |
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| Year | 9.9 | 19.5 | 14.7 | 49.8 | 67.2 | 58.5 |
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Precipitation amounts to 825 millimeters (32.5 inches) per year: so, it is at an intermediate level. It ranges from 30 mm (1.2 in) in the driest month (July) to 125 mm (4.9 in) in the wettest one (November). Here is the average precipitation.Siena - Average precipitation| Month | Millimeters | Inches | Days |
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| January | 55 | 2.2 | 7 |
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| February | 60 | 2.4 | 7 |
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| March | 60 | 2.4 | 8 |
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| April | 70 | 2.8 | 8 |
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| May | 70 | 2.8 | 8 |
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| June | 50 | 2 | 6 |
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| July | 30 | 1.2 | 3 |
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| August | 40 | 1.6 | 4 |
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| September | 80 | 3.1 | 7 |
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| October | 105 | 4.1 | 8 |
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| November | 125 | 4.9 | 10 |
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| December | 75 | 3 | 9 |
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| Year | 825 | 32.5 | 84 |
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There are on average around 2365 sunshine hours per year. Here are the average hours of sunshine per day.
Siena - Sunshine hours| Month | Average | Total |
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January | 4 | 120 | February | 4.5 | 125 | March | 5.5 | 165 | April | 6.5 | 190 | May | 8 | 240 | June | 9 | 275 | July | 10.5 | 320 | August | 9.5 | 295 | September | 7.5 | 230 | October | 6 | 180 | November | 4 | 115 | December | 3.5 | 110 | Year | 6.5 | 2365 |
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