Siena, Italy: Annual Weather Averages

July is the hottest month in Siena with an average temperature of 23.05°C (73°F) and the coldest is January at 6.55°C (44°F) with the most daily sunshine hours at 9 in July. The wettest month is November with an average of 95.3mm of rain. The best month to swim in the sea is in August when the average sea temperature is 25.17397667°C (77°F).

Average Temperature: Siena

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7 7 9 12 16 20 23 23 20 16 10 7
°F 44 44 48 53 61 67 73 73 67 60 51 45

Average High/Low Temperature: Siena

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High °C 9 9 12 15 20 23 27 27 23 19 13 9
Low °C 4 4 6 8 12 16 19 19 16 13 8 5
High °F 48 49 53 59 67 74 81 80 74 65 55 49
Low °F 40 40 43 47 54 61 66 66 61 55 46 42

Average Rainfall: Siena

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 64 67 71 70 62 56 45 59 78 87 95 69
Days 8 8 8 9 7 6 25 6 7 7 9 8

Average Daily Sunshine Hours: Siena

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hours 4 4 5 5 6 7 9 8 7 5 3 3

Average Sea Temperature: Siena

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  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 14 14 14 15 18 21 24 25 22 20 18 15
°F 57 56 57 59 65 71 76 77 72 68 64 60

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